Back in the game after 20 years of raising a family and your videos have helped me considerably with my 300TPI. These bikes are a different ball game from the old school smokers.

@slaverace1

4 ай бұрын

Glad to help.

Thx for these videos. Just bought my first KTM. A little late to the game. Your videos help me a lot.

@slaverace1

Жыл бұрын

Glad to help!

Ive used the same method on the TPI. Works every time.

On the '23 TBI, to release the "cold start" (yellow) button, without blipping the throttle, you can also just roll the throttle forward. Thought I'd throw that in there for anyone curious.

@scottfast03

Жыл бұрын

Agreed. I roll it forward as well, I don’t rev it

@tylerhall3854

Жыл бұрын

Same

@lancelitwiller522

Жыл бұрын

Same with the earlier fuel injected four strokes. Roll the throttle forward gently to release the “cold start” high idle.

@ShawnBlais

Жыл бұрын

Same on my '17 Husky 350

@slaverace1

Жыл бұрын

You’re correct. I’m obviously a little rusty because I never use them.

I appreciate the informative videos, I have been looking at getting a new bike, I have talked to other riders about their fuel injected bikes. I have watched them go thru startup procedures, some just hit the start button give a short warm up and go with no issues. I have seen some scared to bring it off idle until warm, must have been old snowmobiler and fowl a plug. Some dealerships aren't to informative, the salesperson doesn't ride bikes and have no clue about what they are selling. Big thanks

Either Slavens or Two Stroke Performance is wrong, which one is it? TSP says that pulling the button on TPI bikes activates a richer setting. This makes sense intuitively for a couple of reasons: 1. The bike starts much quicker in cold weather with the button pulled than without (try it). If it was only letting more air in as Jeff suggests, the bike would take longer to start because the lean condition caused by the cold dense air would only be exacerbated. 2. KTM engineers would not be recommending this for cold start if it just added more air. They know what they’re doing and they know what this button does for the bike.

@breckboy654

Жыл бұрын

Interesting points. Definitely a big TSP fan something else to note though is that these bikes run richer in a cold condition regardless of the “cold start” switch the ECU has a warm up map that dump, some more fuel and oil until it sees a certain temperature with the coolant temp sensor on the head. That is why TPI bikes smoke and run like crap when they are cold as soon as it warms up basically no smoke and the bike is fueled perfectly. Edit: because voice to text is terrible.

Great video, I learned a lot. Thank you.

@slaverace1

5 ай бұрын

Glad it was helpful!

I have been pulling out the yellow (cold start) knob each time when starting my 22 FX350. It fires up, but always seems to be an extremely high idle for a cold engine. I usually end up clicking it off with the throttle after a few seconds. I will start trying to just start the bike cold without pulling that knob and see what success I have. Thanks for the vid!

Thanks for the post!👍

I do not have the experience of Jeff but seems fairly straightforward to me. Coolant sensor says it is cold. Ambient air temp sensor says it's bloody cold. Open loop system says to ECU when these two sensors say its is cold I need to shoot in a bunch more fuel. So with a bunch more fuel, mixture needs more air, so pull the knob on TPI's, push knob on 4 stokes to give mixture more air. That's why it is called a cold start knob. Use it when it is cold. Recent experience on my FX 350 would not start without use of the knob, previous experience on my EXC 500 showed much easier cold starts with knob and definitely use it on my TPI 2 stroke so rich mixture does not load up engine and foul plug. Again whatever works for you is likely best.

Hey Jeff, you can also just roll the throttle forward to release the yellow know fast idle. You don't have to blip it.

I just push the button and ride. You are totally right about people doing goofy things.

I would like to explain the engineering behind your starting procedure. I use the same procedure. When starting a cold engine with cold fuel, the fuel takes some time to fully vaporize when the spray is hitting cold components (throttle body incase of TPI/TBI or piston in case of DI) So by hitting the starter button briefly and waiting for one second you are giving the fuel some time to vaporize allowing for a slightly richer mixture the next time you crank again. You may think that the old fuel would have gone past the exhaust valve but remember its not fully vaporized and some will stick to piston. So hitting the starter intermittently will help you achieve a richer mixture for a good healthy start even temperature is very cold.

Awesome Jeff, I was waiting as you moved from bike to bike for a revalation. Then it came, “Push the start button”, still laughing. Love your brutally honest videos.

My first time riding my 2019 300xcw was was a couple weeks ago in a desert scrambles race. A world of difference from the 4 strokes I've been riding for years. Starts right up then doesn't want to idle. Your fast idle adjust info should be a big help.

I believe the “cold start” button is to prevent fouled plugs. The ecu provides richer conditions when cold, so the additional air ensures you don’t foul a plug before the bike is hot.

@slaverace1

Жыл бұрын

That’s as good a theory as any. 👀

@west1686

Жыл бұрын

Yep, that is essentially what the manual says

@rogase68

Жыл бұрын

My bike was fouling plugs post tsp kit installed and their advice was to warm the bike up fully with the cold start button pulled out.

Thank you

Worth mentioning, that the EFI 4stroke EXC also has a cold start enrichment button(choke) and it uses the throttle to turn it Off. But once started you do the opposite by pushing the throttle CLOSED to hear it click off the cold start button.

@slaverace1

Жыл бұрын

Sorry, you are incorrect. The yellow button you are calling an enrichment button is not a choke and does not add fuel. Take off the plastic cover and take a look. It only holds the cable pulley in a partially open position for a fast idle. You are correct on how to shut it off.

@jr.6199

Жыл бұрын

@Slavens Racing thanks I should know better than to talk semantics here.

you push the throttle foward to turn off the high idle not wide open, try it

So I noticed when it gets colder (Kalifornistan, so not like back east cold) neither my 450, 350, or my 300 will light off. Pushing in the cold-start/fast-idle button lights 'em off immediately, every time. Valves are spot on on both 4 strokes, in 60-50deg temps (first time starting for the day) they all like the fast idle on to start. I let 'em idle like that for a short period, then kick 'em back out and let 'em idle normally. Point being, while I can only speak for my bikes, the fast idle DOES work to get 'em lit when they won't start normally. Little tip here...: a long screw driver works(t-handle does as well) to get in there to push it in/pull it out when you have big hands like some of us do and its difficult to get your paws in there.

do you have oil spooge out of the silencer ever? slow trail riding causes this? is there a way to eliminate the spooge factor?

Any chance you could make a part 2 on warm-up procedure from starting cold to operating temp?

@slaverace1

Жыл бұрын

Hello Austin: Seems like you are over-thinking the warm up. In the video I said I get my gear on, get on the bike, start it and head down the trail at a leisurely pace for a few miles then let er rip! Do you let your car/truck warm up for 15-20 minutes every time you head to work? Probably not, so why do you want some special procedure for your bike. Just ride it and enjoy.

KTM have gone a lot of trouble telling users, to use the cold start button on the 300 TPI, (6,20 pg. 21). The ECU has 2 maps, a cold start map and a normal map, the cold start that throws more fuel / oil into the engine up until a set temperature, then reverts to the normal map.... Reference TSP

How about do what the manual says.

After you started it you blipped a throttle a little bit (to not get the cold engine stalled right?). So my guess for the KTM manual always was that they did not want to ask people to "blip a throttle" bc most of them would go crazy high rev multiple times, and that might damage a cylinder coating when it's cold. So instead KTM came up with the idea that asking to temporarily put in high throttle would also help it start and KTM does not have to explain what is "to gently blip a throttle".

You're supposed to start the TPI engine with the high idle knob on, only for a few seconds then shut it off, then start it back up. Reason for this is the sensor recalculates the elevation settings. Once you start it the second time with the idle knob on, let it idle high until it starts doing a strange rev by itself. Once that happens turn off high idle. Then do not ride the bike hard for another 12 15 minutes. After that, rip time all day. I've taken many bike engines apart and doing a warm up with with TPI, you can go a few hundred hours before needing top end...

That 2500 XCF-W must be one bad mama jamma!

I was told by the dealers not to touch the red knob, I adjust my idle with the yellow

@slaverace1

Жыл бұрын

Good luck with that. You have been given bad information. Read your manual.

Good tips. I have a 2009 Husqvarna Te310 4 stroke injected bike. A lot of these models have busted starters, owing to the fact people just hold them on, instead of short blips and start. My electric start works fine. I have the black fast idle pull knob, I agree totally to use it only after the bike started. Good for warmup before taking off when it is really cold, idle revs double immediately on pulling the fast idle knob out. Can you tell me what the little short lever next to the clutch is. Is it some sort of decompression lever to make kicking the bike easier if required??.

@slaverace1

Жыл бұрын

It's a Rekluse Left Hand Rear Brake Kit, slavensracing.com/shop/dual-actuated-left-hand-rear-brake-kit-ktm-berg-hqv-rekluse/

@andyroo3022

Жыл бұрын

@@slaverace1 Great idea, this brake lever kit.

"The cold start button 1 is fitted to the bottom of the throttle valve body. The electronic fuel injection system extends the injection time if the engine is cold and the ambient temperature is low. To help the engine burn the increased fuel quantity, it must be supplied with additional oxygen by pushing the cold start button. After briefly opening up the throttle and then releasing the throttle grip again, or turning the throttle grip towards the front, the cold start button returns to its original position." - direct quote from the PDF manual it's great you live in a desert that you don't need a cold start, but you're flat out wrong about how they function

@slaverace1

Жыл бұрын

You are correct. You can push the throttle forward or wide open to release the cold start button. However, I don't use the button. I start it and ride without letting it sit. Do it however you wish.

What about starting in the wet, is the procedure different?

@MAXlMUS

Жыл бұрын

Wipe the seat with a dry cloth, start as usual 😁

Oh wow look at all those mxt national shocks 😳

@onthethrottle7104

Жыл бұрын

I know, that is sexy isn't it!!!!!! I'm getting one soon.

👍👍

I thought you would explain the warm up procedure of the different bikes.

@slaverace1

Жыл бұрын

Hello: I've explained that in other videos. Put on your riding gear, start your bike and go ride easily until it is up to temp. Why do you want to sit there and warm up your bike? Do you warm up your car or truck every time you use it?

husq fc 450 140 hours never used fast idle to start

When first starting A TPI 250 2 stroke, Is it okay to let it idle. Until it warms up. Gas gas 2023 EC250

@slaverace1

10 ай бұрын

Sure, but that has no positive purpose and will lead to fouled plugs and clogged power valves.

With the yellow one pulled out my bike wont start what should I do?

@slaverace1

Ай бұрын

Hello: Don't use the yellow knob.

Some way to replace the Li-Po battery with a lead acid during wintertime? I do some biking down to - 15 celsius and the Li-Po is not coping well.. Greeting from Sweden...

@LuckyNikitaBoba

Жыл бұрын

How about convert it into a 24V system by using a smaller 12V lithium battery. There’s is a guy on KZread who converted the starter process to a 24V but then the system would charge the primary battery with the standard 12V.

@kennethmikaelsson7990

Жыл бұрын

@@LuckyNikitaBoba It´s the Li-Po battery thats the problem it doesnt like the cold... -15 C and almost dead and you have to take it out of the bike and load in a warm place...

@lancelitwiller522

Жыл бұрын

Kenneth, if you push the start button for a couple seconds, release, wait 30 seconds and repeat. This may take a few times when it’s really cold, but doing this actually “warms up” the lithium battery, giving it essentially more starting power each time.

@kennethmikaelsson7990

Жыл бұрын

@@lancelitwiller522 Jupp that's what i have been doing... but my older bikes with lead acid was better when it is cold...

The high idle comes off when throttle is twisted towards off position. Ofcourse cables have to be adjusted properly. No need to rev the engine.

@slaverace1

15 күн бұрын

Hello: Both methods work well.

Read.the manual. To release high idle you roll forward. Been like that for years on husky 4 strokes.

@slaverace1

2 ай бұрын

Hello: It works both ways to release the fast idle.

You should let KTM know they are wrong and you are correct.

@slaverace1

Жыл бұрын

Just trying to help but use whatever method you want. My bikes start very easily.

What about just doing a one nice manual kick to squirt fuel rather then button bursts?

@Aldershot1993

Жыл бұрын

No more kick starts on the bikes

Appreciate the video! Curious on thoughts regarding how long to let these TPI and TBI bikes to idle before riding? Thanks

@bikesbeersbeats

Жыл бұрын

I always get mine to between 90f and 100f

@2stroke-nut

Жыл бұрын

I prefer to idle the bike till the rads are warm to the touch.

well, not really - yellow knob whatever it does it DOES help with cold start - I ride all year round snow or sun and when cold I always use yellow knob and starts right up. Without it not a chance. Another thing, bumping starter button first of all wakes up lithium battery, that's why we doi it, not to prime fuel pump or other things.

@slaverace1

5 ай бұрын

Whatever gets you out for throttle therapy is what you should do. My bikes don't need the yellow knob to start correctly.

@robsonenduro3316

5 ай бұрын

@@slaverace1 only because you riding in warm climate or you don't ride at freezing temperatures.

On the 500, the tank looks like a nut basher.

@slaverace1

3 ай бұрын

Hello Elvis: If your junk is banging on the tank, you have bigger issues, you are going over the bars. Hang on!!!

Dude you need to read the manual before making these videos. None of the bikes have a cold start button? My 23 300xc manual says to push the cold start button when it’s less than 68 degrees. It makes a huge difference starting a cold motor when it’s 40 degrees outside

@slaverace1

Жыл бұрын

Dude, I’ve read the manual. As I clearly stated in the video, there is NO true cold start button. The 4 strokes and the TBI 2 strokes just have the fast idle yellow button that is NOT a “cold start button”. The TPi models have a knob that adds air when pulled. It is called a “cold start” but is not. I don’t use any of them because they don’t help, but if it makes you happy, pull your knob.

@onthethrottle7104

Жыл бұрын

@@slaverace1 I love you to death, but the manual states "pull the cold start button and turn it one quarter turn". The manual shows a picture of the "cold start button" and it's the same item you are calling the "fast idle screw". Let's face it, that "cold start button" or "fast idle screw" was put there for one reason and one reason only - to start the bike up when it's cold.

@slaverace1

Жыл бұрын

@@onthethrottle7104 Do whatever works for you. I don’t use them. My bikes start well without pulling any knobs or buttons.

@LocalGarage

Жыл бұрын

@@slaverace1 but dont your TPI bikes have aftermarket idle speed screws? If they do, thats not the same as some guy trying to cold start a bone stock bike

@slaverace1

Жыл бұрын

@@LocalGarage Hello, Yes my bikes have our idle screws but that does not change the starting procedure.

i mean, why are we assuming that KTM doesn't know how their motorcycles work? They engineer some of most advanced machines on the planet and we are just assuming that their manual is incorrect? The only time ive ever fouled a plug on my TPI was listening to some bad advice on youtube... just sayin... (it wasnt from this channel)

I never understood why you have these coldstart and other buttons on the ktm fuel injectet bikes. that should be the job of the electronics to regulate everything. IMO Like on a car... Just hit the start button and go riding.

@slaverace1

Жыл бұрын

Agreed. I don't use the buttons.

The manual clearly states it's called a cold start button. The manual also clearly states that when the bike is cold the system will add extra fuel and oil until it warms up. The Cold Start button allows more air to enter the mixture so as to be able to burn the extra fuel and oil entered into the system automatically by the bike upon cold start so as not to gum the bike up and allow it to run at a high idle until it warms up, a simple push forward on the throttle grip will disengage the cold start. Sorry buddy, Mr Slavens, I know you know your stuff and have been around these things for a while but you are just plain wrong and if you are not using the cold start then good for you but you are going against what the manufacturer and their very expensive DEV/RnD team has said and clearly state in the shop manual for the bike. This is not good advice you are dispensing, I hope folks read and understand their manual and don't just go off what you're telling them as you are misinformed.

@slaverace1

Ай бұрын

Hello Basement Dude: Thanks for your insight. If I lived by the manual, I would spend all my spare time working on my bike versus riding it. The manual clearly states that you should check the fuel pressure every 20 hours. Do you do that? It also clearly states to rebuild your forks every 10 hours and your shock at 20 hours. Do you do that? It also clearly states to do a complete engine rebuild at 80 hours. Do you do that? Manuals clearly are not written by the R&D/Development department or anyone with common sense. They are written by writers, not engineers or mechanics, that probably don't even ride dirt bikes. The stated "cold start button" is not a choke or a fuel enrichening device. It simply opens an air passage on TPi models and moves the throttle cable pulley on 4 strokes. Yes, the fuel injection system richens the fueling slightly when the engine is cold but the problem is the baseline O.E.M. mapping is WAY too lean. Even when it is slightly richened it is still too lean and adding more air is detrimental, NOT helpful. Sorry sir, but the information in the video is plain right. Regards, JS

With my KTM Freeride 250R in the winter, I would put it in gear and push it to cycle the piston at least one revolution then give it a couple of throttle twist to give it some gas. Finally, hit the starter button. To be honest, I’m not sure if it helps.

@lboughto

Жыл бұрын

On my KTM Freeride E-XC I turn the key on wait for it to beep push the start button and go. No warm up needed!