We were riding our bruin the other day and all of a sudden it just stopped. It was a very hot day so I figured I would just let it cool and try it again later. It still wont start, if I crank it over and over, I might get a backfire once or twice but nothing other than that. It is getting gas and spark, I cleanded the plug and still nothing. I took at the look at the valves and they needed adjustment but not too bad.
I figured if it jumped time the valves would be in their proper position.

Any other ideas that I can look at?

thanks

 

What will it do on starting fluid? bad ground somewhere? test cdi unit?

 

x2 on the starting fluid, best starting point shoot it right into the carb

also, water in carb will do pretty much what you are describing

 

We have baiscally taken everything off. The opening where the Carb connects, I have sprayed in starting fluid and still nothing. It was running fine, valves did need to be adjusted because of valve lash, but it was running good. Of course I was not the one ridding it when it died so I am unsure exactly what it sounded like or what it did when it died.
I do know thought, it is getting spark, I have pulled the plug out and grouneded it agains the motor and the spark looks good. It is a brand new battery put in a few days before this problem.
I dont have a compression tester handy but I do know there is some compression. May have to rent or buy one just to check that.
I am also wondering if it might have jumped time just enough to cause it not to fire.

 

I would think if the chain jumped that it would have at minimum bent a valve but a compression check would tell you that. Tester's are inexpensive and you can probably get one on loan from O Riellys, Autozone, Etc. Anytime I've over thought the problem it turns out to be something easy and I wonder how I missed it in the first place. You can buy a manual on cd for like 10.00 on ebay, they are a lot of help. Good Luck

 

I already purchased the manual on CD a few years back and have been looking at it. I think I have to tear into the motor something bad has happened. If I blow air into the cyclinder when it is at TDC on compression stroke, I can hear air going through the motor and out the exhause. I am guessing that means something bad. I also noticed when manually turning over motor it seems to bind a little, dont know how else to explain it.
What are your thoughts, motor need rebuilt?

 

Sounds like your going to have to start at the top and work your way down.

 

I was guessing that. Well it will give me something to do I guess...
Thanks for all of the help and information.