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YX 150 help? Cases need split. Any upgrades?

1945 Views 9 Replies 5 Participants Last post by  andy123
New to the forum....having major problems with my yx 150 nitro motor. Never was right out of the box, was jumping in and out of third and locked up. Found bearing outer skirt in case when I pulled the first time. Upon another inspection after pulling clutch and oil pump, found these chunks...thank you oil screen!! It has broken a part of the case, but not completely. My ??? is should I send it to have it repaired or am I looking at a parts motor now?? Money wise.......have around 500.00 in it complete. What type of money to split this and repair? Also....heard it from a friend there is an upgrade to this weak inner case for these and it may be a common problem. Anybody??? By the way....the motor does still run great in all the other gears..thanks here are the pics
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Friend is correct. Gen1 YX had a goofy thin-race bearing there, and would break the bearing and/or case from kick starting. There is a repair kit that includes a stronger case half with Japanese needle bearing in that location. it includes a matching trans output cluster and idler gear.

If you have to pay to have the work done, plus two-way shipping, it may get close to the cost of a replacement engine. But, since you've got it that far, I bet you can tackle the rest;) Really, all you need to be careful of is washer location on dis-assembly. They're not too difficlt an engine to work on.

$104, and you're rolling again.

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tblumer said:
I thought the nitros had the case upgrades? The one I got from Wholesale is starting to act up when kicking it over, and I haven't even got 20 minutes of run time on it. I presume that's why he was clearing them out cheap. I even modded the flywheel to help with the kickback. Oh well, even with having to buy the case upgrade it was still cheaper than my Lifan.

Yep, $104 and you're rolling again. Again:)

Can ship with the Honda cases...
andy123 said:
Mine did it new within the first 20 minutes as well:confused: Better quit while you are ahead I would guess. This motor is in a atc 70 3 wheeler and will be push started from now on, no kicker for me. It runs flat track only, no woods or trails. Could someone provide a manual for this motor or at least list the steps involved in splitting?? I have a good idea, just don't want to forget a step,part,torque setting etc... Thanks for the quick replies..

Make sure the bearing shell or case isn't broken already, or you'll be replacing the input cluster too, when it lets the bearing out and spreads the shafts. Might even get the other side case. For a bump-only, you can get new early case halves CHEAP. The sleeved bearing trick is typically enough for a no-kick version.
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