Note to first timers shove a rag under the piston before pulling wrist pin clips. One falls down in your day just got ruined

@owensworkshop

3 жыл бұрын

Agreed. I was just a beast and did it like a pro but next time I will stuff a rag in there since it's not worth the risk.

Professional video and instructions, you have a bright future 👍

@owenruth325

3 жыл бұрын

Thank you.

Thanks for posting, Owen-very helpful, been near 20 years between doing top ends, and my first KTM. 👍🏻👍🏻

Thank you so much definitely showed me not to stress the rebuild and the challenge is nothing more then patience and concentration

I'm Italian and I understood everything. You are so good, keep it up.

Great tutorial 👍

this helped a lot. thanks man

Really good video mate, good explanation and demonstration, keep it up

Great video

Great video !

bruh you put mad effort in your vids

Nice vid. I Will replace on my KTM 150 2018 this week

Great video ! good to see maintenance on a new 125 please keep them comming . general such as oils and whatever you do to keep up with scheduals thanks . very clear instructions

@owensworkshop

3 жыл бұрын

I am going to start a new series on that bike. It will be focused on some of the basics.

@josephbuczek9949

3 жыл бұрын

@@owensworkshop just curious . i see a ktm not sure what it is but your feeling on what you prefer the tc 125 or ktm 125 ? Not that you can go wrong with either just your own opinion ,

@owensworkshop

3 жыл бұрын

@@josephbuczek9949 Simply put it comes down to personal preference on the bikes appearance. The KTM and Husky are almost identical so to most riders there is no difference other than looks. I will say on the technical and testing side of things that KTM is better. Based on my own experience the KTM will have slightly more power as a result of the air box design (aluminum frame with side number plates vs the husky composite design) which allows for more airflow. KTM now makes an air box cover with drilled out holes and people have been modifying the air boxes on both brands for greater airflow in order to increase power. I did this on my husky 125 and it makes the bike a lot better in conjunction with an FMF exhaust system. It is not noticeable at first glance that my bike is modified since the side number plates are not drilled or cut out but underneath I cut large holes in my air box to allow for better airflow. The side number plates simply block large amounts of dirt while the air box underneath can breath from all sides but the rear. If I were to summarize this paragraph I would say with the following: I prefer the Husky simply because of the looks and because KTM and Husky bikes are basically identical. When it comes to hard core racers go with the KTM for the increased airflow air box design and the more aggressive ECU mapping (based on some forums and tests they say KTMs have better and more powerful mapping). Great question. Hope this helps.

@josephbuczek9949

3 жыл бұрын

@@owensworkshop yeh i happen to like the looks of the husqvarna over the ktm myself . Im sure if your pro or even expert class the ktm might have the advantage but for those who arnt in it to race pro im thinking the husqvarna vs ktm might not be noticable if im even correct, i have seen penty of videos and when its wide open you can even hear a slight difference in the high end ( ktm just a tad more rev) i think id prefer the tc 125 over the sx 125 seeing pro competition isnt even in my mind i used to have cr 125s and rm 125s in the early 80s and i found them both to be just as good for my skills at that time. If some one were to have asked me what one was better i wouldnt be able to say i liked them both Also owend a 1975 honda mr175 / suzuki pe 175 great enduro bikes in thier day and the ktm and husqavarna have really stepped things up since those days. But The husky really has caught my eye for the last few years ( tc 125) beautiful bikes stock even. ok thanks for your thoughts . Be safe . I wont say break a leg cuz ive been there !! ride safe , looking forward to more videos from you !

professional bro, from italy :)

@owensworkshop

3 жыл бұрын

Thank you.

Its good you know mechanics

I just did my 150sx and be careful with using parts cleaner, the o-rings in the power valve can swell causing it to stick, also within 25 hrs the power valve, depending on the premix you use, can be coated with carbon buildup, I was surprised. Love the vid🤘

@owensworkshop

3 жыл бұрын

Thank you. I agree with you. We run maxima k2 at 40:1 with stock jetting and I don't get much oil reside or gunk. Also, for this video i didn't cover cleaning the power-valve since i think thats a topic for a different video.

@charlieolson1900

3 жыл бұрын

@@owensworkshop it’s a pain to clean lmao

@owensworkshop

3 жыл бұрын

@@charlieolson1900 IKR!

thanks for the help

Nice bike

@owensworkshop

3 жыл бұрын

Thank you. For sale in spring of 2021!

Will re watch after I get my cylinder back from being re sleeved! Where did you go to buy oem top end?

@owenruth325

3 жыл бұрын

I source my parts from rocky mountain atv www.rockymountainatvmc.com . They have like 99% of the oem parts for all the dirt bike makes and models. They also sell a lot of aftermarket parts. Great prices and fast shipping even with COVID-19.

What do you recommend measuring the base gasket with, also should I check the piston ring end gap at all?

@owensworkshop

2 жыл бұрын

I use a digital caliper to measure the base gasket thickness. The proper and most precise way to set your gasket thickness or "deck height" is by using a decking gauge and preforming what is called "decking". I have never specifically checked the ring gap when doing a top end rebuild; however, I think it is a valid measurement to check. The piston ring gap tolerance is less than or equal to 0.40mm. The piston diameter tolerance is less than or equal to 0.010mm. I hope this helps!

Hi, I removed the exhaust valve cover on the left and although the piston has 13 hours and the carb ratio is right I found a lot of oil residues. It's normal? I use maxima 927

@owensworkshop

2 жыл бұрын

Yes, I would say that is somewhat normal as I have experienced the same thing on my KTM 2 Strokes. Not much oil but just a little bit. If you are finding a lot of oil (more than 1/16 teaspoon) behind your power valve covers I would consider replacing your power valve Viton O-rings as they may be worn out and allowing oil to blow by into that area. I would also consider checking the condition of the power valve cover gaskets as I believe those should be making a tight seal as well. On a service note, I recommend replacing the power valve o-rings when you can and at least inspecting the power valve gasket covers. As far as the oil you are using, castor 927 is good. Just make sure you are mixing the correct ratio and mixing accurately. Hope this helps!

Do you know where to get a 2016 ktm bottom and top end rebuild kit?

@owensworkshop

2 жыл бұрын

I recommend Rockymountainatvmc.com because they have a complete OEM catalog of parts and a good selection of aftermarket parts. Additionally, their customer service and shipping is really good

I got my new piston in and 2 rings came with it but there is only one groove for it. Is that ok or do I need a different one

@owensworkshop

3 жыл бұрын

I don't know. I would contact the manufacturer and ask them. My best guess is that it's a spare.

@bryson96.

3 жыл бұрын

@@owensworkshop hey I figured out the rings it’s because the aftermarket piston only has one and the other is extra like you said but I have another question about the power valve linkage clip. It can off easy and now I’m trying to put it back in and it won’t go through and I don’t see how it would because there are no holes in the ball the linkage locks onto. Do you know why this would happen?

@bryson96.

3 жыл бұрын

@@owensworkshop never mind I got it I just didn’t hit it on far enough

How many NM did you thight cilynder head and cilinder liner? Thanks

@owenruth325

6 ай бұрын

Cylinder head screws are 18nm and the cylinder base nuts are 23nm.

@simonecaltabiano4883

6 ай бұрын

@@owenruth325super 💪

Hi, how would you measure the base gasket ? Great video,tx!

@owensworkshop

2 жыл бұрын

I use a tool called a Digital Caliper to measure my base gasket thickness. Find a virgin area of the gasket which has not been compressed between the cylinder and the engine cases. Cutout and place that virgin base gasket surface area in between the measuring jaws of the caliper and slide the jaws closed until they make contact on both sides of the gasket. Take the reading and write down the number. Repeat this process on a few other virgin surface areas of the gasket and see what the numbers are and then find a base gasket that is the same thickness or very very close. For example if I made my measurements and I got a number that read .049mm then I would round up to the nearest gasket which is a .050mm. If I got a measurement of .026mm then I would round down and select a .025mm base gasket. If you order a gasket kit, especially the OEM gaskets, it will come with many thicknesses which you should be able to correctly match (sometimes by color if it's OEM because they will make certain sizes white or green which helps differentiate each size). Also note that some KTM/Husky bikes stack gaskets to achieve a certain thickness. For example a KTM 85 might stack a .020mm and a .025mm to achieve an overall base gasket thickness of .045mm. In any event, I recommend being as precise as possible in your measuring or alternatively watching a KZread video on how to "deck" a 2 stroke which is a more precise way to set base gasket thickness. I did not "deck" my 125 because it was blatantly obvious which gasket size was "factory" because I measured the original base gasket with a caliper and got a reading of .050mm and it was dark green and my OEM kit came with a dark green .050mm replacement gasket which I determined matched the factory gasket perfectly. I hope this helps!

@cerebralabyss9993

2 жыл бұрын

@@owensworkshop It does indeed,tx a lot !

what parts cleaner did you use

@owensworkshop

2 жыл бұрын

I use a variety depending on the application. WD-40 for scrubbing parts with a wire brush, Gunk degreaser for oil and grease, and then maxima contact cleaner or any brand of carb and choke cleaner for cleaning anything that is not covered in grease or oil. Note that the carb cleaner will melt certain rubbers and plastics.

How many hours do you go on a top end ? I hear all sorts of things

@owensworkshop

2 жыл бұрын

KTM recommends doing the top end every 20hrs, However... I think it is dependent on how hard you ride the bike. The reason there are so many different answers is for that reason. When I started off with my 125 I would do my top ends after over 40hrs but once I started racing I could only go to 35hrs before my pistons cracked. Based on my somewhat extensive experience and using only OEM KTM pistons this is what I think: Hard racing: every 20hrs (best performance and safety), intense practice and advanced riders: every 30hrs, basic riders and weekend warriors: every 40hrs, beginners: maybe over 40hrs. A couple notes. 1) 2-stroke oil brand matters. The better the oil you mix with the longer your pistons will last and the better your fuel will burn. I only mix with Maxima K2 synthetic oil at 40:1 for 85's and 125's and my bike runs clean and the pistons last longer than when run with other oil brands. 2) Mixture ratio and Jetting matters. The ratio you mix oil in combination with your jetting also has an impact on how long your top end will last. Generally speaking, the less oil you use in your mixture for your jetting spec the less lubrication your piston gets so it will deteriorate quicker. You are trading endurance for performance. 3) I think piston brand has a big impact on when you do a top end because of the composition and performance specs each piston has. Gared steinke mentioned he likes OEM pistons and I would agree with him. 4) you can sort of check your top end by taking off your pipe and looking at the side wall of the piston to see if it is worn. On OEM pistons if the grey coating is wearing off and the color changes to sort of a dark grey metallic silver it is time to replace the piston. 5) replacing a piston early is not a bad thing. I waited too long and my piston fractured which caused me to need to rebuild the whole engine. Replacing your piston early is an easy way to restore lost power and prevent a catastrophic failure. 6) the more top ends you do the better you will become at gauging when to do a top end both by physical observation of the engine components and by feeling the bikes performance. Hope this helps!

I solute

what number on the cylinder/piston would determine if I needed piston 1 or 2?

@owenruth325

3 жыл бұрын

I'm not exactly sure. I believe my dealership told me that the cylinder has a piston tolerance and that it can be identified by a mark on the cylinder. The service manual specifies that piston 1 fits a cylinder with a diameter 54-54.012mm and piston 2 fits a cylinder with a diameter of 54.012-54.025mm.

@Choz07818

3 жыл бұрын

@@owenruth325 Ok, Thanks man!

@owensworkshop

3 жыл бұрын

@@Choz07818 Just use a cylinder bore gauge and it will tell you it's spec. If you don't have access to the tools and you need a best guess, go with Piston 1. I'm selling my 125 next spring and it has 180 hrs. I have replaced the top end multiple times and it has done just fine on piston 1.

@owensworkshop

3 жыл бұрын

KTM Husqvarna specifies that "Size I" corresponds to a cylinder with a bore diameter of "54.000...54.012mm" while "Size II" corresponds to a cylinder with a bore diameter of "54.012...54.025mm". A bore diameter that is "Size I" corresponds to Piston I kpl. 125 (Piston size I) while a bore diameter that is "Size II" corresponds to Piston II kpl. 125 (Piston size II).

Buddy I'm sorry to say that ,but you did something bad , you didn't measure cylinder and use on it and piston may be too small and it may cause piston slap ,but overall job is done great , you took some time to clean parts unlike some people

i’m doing it i’m scared as fuck

Stuffs a rag in the bottom end once you took the clip out 🤦‍♂️

@owensworkshop

3 жыл бұрын

At the time it's because the rag got in the way of the camera. But yes... I agree 😬.

@robhayter484

3 жыл бұрын

@@owensworkshop very good video tho mate 👍