Quantcast
Jump to content

  • Do you own an ATV or UTV? Join our Forum!

    Join QUADCRAZY ATV Forum today for FREE! We keep these forums clean and user friendly. All first posters will have to wait to have their content reviewed and approved. Once your first post is approved, you will no longer need to got through an approval process. To gain immediate approval and a NO ADS experience, consider subsribing to our Premium Membership.

Old 1989 Yamaha big bear 350 won't start


Recommended Posts

I have an old '89 big bear 350 that I am having trouble with . I have cleaned the carb , install ed a new stator , pulsar coil , ignition coil , CDI box ,new plug ,  timing is dead on , and a new intake boot , compression test says 125 lbs . When I crank it over it will start , but won't run it acts as if it's either got a bad vacuum or compression leak or is out of time . If you have any input maybe it will help I am about out of ideas .  When I got it it was not firing and the guy said he had it idling and it just died and wouldn't start . I have ordered a new carb but have my doubt's it's going to help because this is the second carb I have cleaned and installed on it . Any Ideas ?

Edited by Samuel Jerome Morris
Link to comment
Share on other sites

  • Ajmboy changed the title to Old 1989 Yamaha big bear 350 won't start
Dream Car Giveaway
  • 4 weeks later...

Ok  got it firing and now it will start . Problem is it just sits and kinda idles like an engine out of time and if i touch the throttle it dies immediatly . I have cleand the carb and then pulled the carb off another one i have and swapped them it runs great on the other bike and mine does the same on this one barely idles . I have checked for clogged exhaust , made sure fuel flow is good checked valve lash and timing . I am out of ideas i think i will pull the head next and check the gasket . The compression is around 130 lbs . Im lost ! Anyone got any ideas ? HELP !!! 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...