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Sno Scoot Problems

 
    
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peakperf
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Joined: 01 Oct 2003
Posts: 68
Location: Hayward Wisconsin

PostPosted: Thu Dec 23, 2010 9:51 am    Post subject: Sno Scoot Problems Reply with quote

I know this isn't the correct forum but I can't seem to login anywhere else on the TY forum.

My GP292 oval racer tow sled, 1988 Sno Scoot, has an issue that I can't figure out. The motor will start on the 1st kick and run great with the choke on. Once you take the choke off, the engine starts to race like the throttle is stuck (but it isn't). Put the choke back on and it idles right back down. I cleaned the carbs but it doesn't seem to help. This carb has 2 electrical wires that connect to the idle screw that I'm not sure what they do, but it won't run with them unplugged. I'm pretty good at solving basic engine problems, but this little motor has me stumped. Any help would be appreciated.

_________________
Yamaha's in the stable:
1972 GP 292, 1972 GP 433, 1972 GP 643,
1966 YG1 80cc, 1978 XS750 Special, 1980 XS 1100 Midnight Special, 1988 Snoscoot, and 2003 RX1 ER (Hauck Cams, K&N's, CDI, Lightweight Exhaust) and 2007 Phazer GT
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rupprider
Expert


Joined: 16 Sep 2004
Posts: 389
Location: northwest ohio

PostPosted: Thu Dec 23, 2010 1:03 pm    Post subject: Reply with quote

Possibly crankshaft seals. When engine starts to race (rev up), it means it's going lean. Can you squirt oil around the seal area while it's running? Not familiar first hand with the Scoots! Good luck.
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couch
Expert


Joined: 15 Feb 2007
Posts: 410
Location: Newfoundland

PostPosted: Thu Dec 23, 2010 3:09 pm    Post subject: Reply with quote

Do you have the service manual? Pull the choke plunger to make sure that it isn't sticking and that its clean. Check the play in the choke cable - 2 mm free play when you pull up on the cable if memory serves me correct.

I had a sport that I bought for parts ... previous owner(s) had #ucked up a few things) when I adjusted the carb settings according to the manual it starts easy and runs smoothly.

The two wires are for the TORS switch which is located on the idle adjustment - to disable / bypass it you have to disconnect and plug each of the two ends coming from the throttle into one another.
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scott17
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Joined: 27 Nov 2006
Posts: 83
Location: coventry 02816 R.I.

PostPosted: Sat Dec 25, 2010 10:55 am    Post subject: Reply with quote

dude 1oo percent carb problem NOT crank seals. the carb has tiny holes and u need to soak the carb. been wrkn on sleds 4 20 yrs and lots and lots of scoots and sports and never one crank seal job !!!! inside the card u will find rubber plugs and a oring bowl gasket so do u self a favor and get new ones before taking appart. Yamaha Rule
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