85 YTM Tri-moto 200 wont start....need help

**shadix518** · 06-03-2009, 07:42 PM

well on the yamaha its really easy to check there is a little srew on plug on the case where the pull start is....the only problem is putting the motor on TDC while lookin in the hole for the T mark on it...lol....also i would like to say i REALLY HATE pull starts......my arm and hand are killing me

**Lukeatc185** · 06-03-2009, 07:44 PM

there should be a mark on the Flywheel, that identifies TDC use a screwdriver in the spark plug hole, make sure when it reads TDC the piston is all the way up.. when u do that, check the cam shaft should be another indicator on the cam shaft gear, im not sure how

engine times spark, its either points or a CDI magnito. if its points wait for another person to repply with that awnser if its magnito u just need to line up the magnito properly. and your timing should be set.

**Lukeatc185** · 06-03-2009, 07:47 PM

just because you have some vacume through the carb dosent mean you have suffiencent compression for combustion.. i have supreme carb vacume until i remove my valve cover.. then i lose everything.. wich means a bad valve because ive checked my piston and rings. remove the valve cover.. then pull the cord if its really easy to pull after you do this.. you have a blown piston bad rings or a bad valve. if it happends. remove the head. if the rings are good and your piston is good. and it sits in the sleve snugg. u have a bad valve.

**shadix518** · 06-03-2009, 07:50 PM

man i hope thats not the case but ill look into it im really curious to see if the plug just has a weak spark....im replaceing it tonight and readjusting the float....

**Lukeatc185** · 06-03-2009, 07:52 PM

regardless... you have a dry plug u have some kind of compression/fuel issue, i wouldint run out and buy a plug.

**shadix518** · 06-03-2009, 07:53 PM

already bought.......

**Lukeatc185** · 06-03-2009, 07:54 PM

once you start getting a wet plug and you still wont fire, then getting a spark plug may be a good idea.

**Lukeatc185** · 06-03-2009, 07:55 PM

put it in see if it fires. if not take off the valve cover and pull the cord a few times and pray to got its still hard to pull.

**shadix518** · 06-03-2009, 07:55 PM

well i dont know i pulled the plug today before work and it smelled like gas so mabe....mabe not

**Lukeatc185** · 06-03-2009, 07:59 PM

it could also be something as small as a head gasket with a bad leak too.

**shadix518** · 06-03-2009, 08:05 PM

mabe but still the running for like 5-10 sec keeps making me think when it ran it spit and sputtered and like i said there was a oil/gas mix that was spitting out of the carb

**Lukeatc185** · 06-03-2009, 08:07 PM

oh there was stuff spewing out of the carb? towards the airbox.. if so sounds like your intake valve is opening when you have compression and its pushing fuel mix and old engine crap out with it..

**Lukeatc185** · 06-03-2009, 08:09 PM

there is oil in your cylinder so you could be getitng your mix in,, and it could be comming back out of your carb... pull of the exaust make sure theres no blockage..

**shadix518** · 06-03-2009, 08:20 PM

well i didnt think of the exhaust......a black puff comes out of the pip when it pops in the exhaust

**Lukeatc185** · 06-03-2009, 08:21 PM

lol you could have a rat in there or something.. ive heard of some weird stuff comming out of airboxes and muflers lol

Thread: 85 YTM Tri-moto 200 wont start....need help

Thread Tools