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Hi guys, I need the following parts to rebuild my YX160 engine this winter, and ofcourse, it's the smallest silliest stuff that's super difficult to source.... So I need some case dowels (assembly pins) for the center cases and I need a part called "Gear box selector arm return pin" it's part...

Probably asked a million times before but just looking for tips on proper break in for a XY160 with a new set of rings, piston, honed cylinder and head.....

oh my goodness, you're right, never thought of that...touché

Ok, but then I'm wondering, given all the strokes of the pistons in all the 4 banger pit bike motors outs there, there has to be someone out there who's piston gaps all lined up at the same time for a short period of time......that would mean you could randomly get a grove worn into your...

Ok,but in this manual, section "engine top end 4-27" just before the middle of the pdf... http://boss.csteam.free.fr/Moto/SM_KLX110-A1.PDF they're showing the top ring gap towards the exhaust and the second ring gap towards the intake....you're saying to put them on the side???? Also, why...

Ok, think I'll just ask my question here instead of starting a new thread. So going through a similar rebuild, honed the cylinder out and bought a new piston and head with valves pre-installed and rings pre-installed in the piston.... My question is, when installing the new piston, I see in the...

Ok, so problem fixed, I put in a 17.5 pilot and about 1.5 turns out and that seemed to do it..... thanks guys.

Hi guys, I'm trying to source a used or broken YX160 case half, the engine frame mounts must be intact. It's for a dummy engine build that I want to use as placeholder for a frame design. Just looking for motor shell parts, no internals, let me know what you have.... thanks-

just to reply to my67xr about my original post. just to clarify, I've taken the carb off the engine with low compression and put it on a new engine with good compression. I'm rebuilding the ORIGINAL engine. Yes, it's a VM26 with spigot mount. Like you're saying all things point to the pilot...

Will try, and report back :) thanks.

Back story: genuine VM26 on a YX160 with low compression and starting to smoke, with this carb on that particular engine ran fine and hard even with low compression, no bog, fairly easy starts etc. no issues, ran it for a whole summer :)!!!! I know, should have changed the rings and valves...

Hmmmm.... just realized maybe the timing caused that build up in the intake, if the exhaust valve closed to early and the intake valve opened too early on the exhaust stroke, then you would get exhaust going up the intake end.... that would make a lot of sense. But I lined up the timing marks...

Ok, so I'm back for a little update. The season is over here in Canada, well almost, and I've pulled the motor and I'm ready for yearly maintenance. So I ended up riding the bike with it smoking a little bit, bike ran great aside from a little smoke and the throttle slide sticking, which was...

ah gotcha, I see what you mean now. I doubt it's that but I'll check it out. Thanks for the advice, would have never thought of that. I'll probably just pull the hose off completely. Will keep posted on the results...

all signs point to leaky valve seals, just not sure. Bike runs A1. I've never had to deal with this before so I'm wondering if leaky valve seals would make for a crappy running machine? How would a blocked breather tube cause smoky combustion...I don't see the connect.

???????????????????? lol.

actually just got back from another little session and all was good as far as throttle sticking goes so it looks like the additive is helping to break the goo from the oily combustion. But again, she smokes like a chimney now and then. Never did that before, black oil coating on the tail pipe...

They should be ok.. set to .003, .004. If they were off, bike would be hard to start and would run rough but it runs great, and rockers won't cause smoke, just bad timing. The smoke is coming from oil getting into the head somehow, probably leaky valve seals would be my guess.

Hey guys, so a little update on this issue, in point form: Ended up buying a new carburetor VM26. - Swapped for new carb - New cables, new twist grip - Fixed a broken cam chain tensioner, it was broke and didn't notice, thought that might be the cause of the problem in itself...

lol..no, this is an issue. trust me. It's notchy at 1/8th turn, so much so it affects the ride and throttle modulation. It's not just "the way it is", it's the slide somehow getting minute bits of gum on it when it's ran for a little while from crap knows where, Clueless as to why this is...