So I was riding today and ..... By Gti (Read 568 times)

[Gti]

I had adjusted the carb and everything was running fine and I gave it the beans coming up a small hill. All of a sudden the engine died and would not restart. The engine would turn over and overall sounded ok. Upon tear down I found the timing chain was broken!! How does this happen, why does this happen and what can be done to prevent this from happening again?

[Alleyoop]

Check your tensioner maybe it backed out and the chain was now whipping up and down. Also going up a hill puts a lot of strain on belts and chains if the motor is struggling to keep the rpms up.
Also the age of the built how many miles on it.
Alleyoop

[mike6736]

What a bummer... What other damage have you found?

Magoo

[Gti]

As of this afternoon no more damage. I will go into the case tomorrow but everything appears to be fine.

Alley - this engine has less than 10 miles on it, this is my 200cc nightmare. Not sure why it would be the tensioner would be the issue only because the chain had no slack in it. Could the tensioner itself be defective? I'm confused. Give me a run down on exactly ho9w the t4ensioner works please.

[Alleyoop]

QUESTION GTI:

1. When you put the chain on the Sprocket before you put the Valves on did the chain have some slack or was it tight?
Alleyoop

[Gti]

I think it had a little slack but it was only because i did not put the tensioner in until I had the cam and everything seated and tightened first. The thing I am questioning is when the screw is in place in the tensioner to keep it from spewing oil, the tensioner does not adjust. What can be done to fix this problem or is it supposed to be this way?

[Alleyoop]

Watch this Video GTI, about 6:00 minutes into the Video he shows how to put the CHAIN TENSIONER on and how it works.
Alleyoop

[Gti]

This is very informative and helps me understand.