How auto and manual decompression works - KTM RFS engine
I shot this for a friend just now and thought it might of interest to others. Cam sprocket and rocker arms from a KTM RFS. Probably an old 520 of 2001 vintage judging from the deco lever stop bolt (superceded in 2003 I think).
No reason, just 2min of education if you're not familiar with this engine.
Oh. And as pointed out by some friends, the external lever pushing the rocker arm actuates BOTH valves. Duh. I just wasn't thinking fast on my feet as I talked. 😉
Пікірлер: 9
Omg this just happened to me recently. I got soo lucky my motor wasn’t Grenade’d though. I was hearing a super lout tapping noise inside my head and I couldn’t figure out what the hell it was. I thought it was the valves, so I adjusted them like 5X and the tapping sound didn’t stop. So I figured we’ll, let’s just go for a ride and see if anything breaks lol. We’ll I came to a stop sign and was holding in the clutch when the engine died out, and wouldn’t turn over, I’m really glad I wasn’t gunning it at that moment in time. I thought a valve was bent or broken and seized the piston or something, but when I opened the head, that stupid little nylon bolt was still at the top just barley hanging on all stripped. I was sooo relieved to find out my head didn’t blow and it was just one little bolt.
@teamagoge-theenduroists8683
2 жыл бұрын
Buy a lottery ticket! 😉
Well done
anyone know if 03 ktm scx 625 has a auto decompression too ? it has the manual decompression lever, but i would just like to know if it has both auto and manual .?. my ktm is not running correctly and i have rebuilt the carb many times and it is still not running correctly
Hi, can you maybe show the old and new Cam Gears in comparison? Because the 2 Bolts holding it all together broke the second time for me and i just cant find that new cam gear.....
@teamagoge-theenduroists8683
2 жыл бұрын
You're looking for CAMSHAFT GEAR 2003 part # 59036011100 It's #26 on the parts listing for a 2007 KTM 525 EXC in the "Timing Valve" section. Not sure if this link below will work www.ktmworld.com/oemparts/a/ktm/600f887387a8660e9cf8335b/timing-valve
Do the 2004 450 rfs have both ? Or just one way of decompression ?
@teamagoge-theenduroists8683
3 жыл бұрын
Should have both. Might have been removed from the bars, but Manual Decomp mechanism is there
@motohero137
3 жыл бұрын
@@teamagoge-theenduroists8683 I have the manual but even with the manual does it have the auto just curious as it’s almost impossible to kick my 450 over