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Old 05-27-2015, 10:17 PM   #1
UltraLife   UltraLife is offline
 
Join Date: May 2015
Location: Seattle, WA
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Oh No Help diagnose a sputtering bike?

I have a 2006 Bajaj Chetak which has served me well for a long time. I rarely start it during the rainy Seattle winters, but drive it a lot in the spring and summer. I went to start it up the other day and it starts and idles fine, but when I turn the throttle, it sputters and has very little power. I made a video so you can see what happens.
Can someone help diagnose this?
Big thanks in advance!
Adam



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Last edited by UltraLife; 05-27-2015 at 10:23 PM. Reason: Link didnt work
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Old 05-27-2015, 10:20 PM   #2
UltraLife   UltraLife is offline
 
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Video link not working

I'll try here and will also put the link in my profile
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Old 05-28-2015, 05:24 PM   #3
Ebuddy   Ebuddy is offline
 
Join Date: Jun 2013
Location: Minnesota
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My first impression is that this could be a vacuum leak. At idle, the carb can keep up but under load, it's sucking in too much air somewhere. I'd check the lines as well as the carb. Pinhole leaks are the worst.....



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Old 05-28-2015, 06:22 PM   #4
UltraLife   UltraLife is offline
 
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Quote:
Originally Posted by Ebuddy View Post
My first impression is that this could be a vacuum leak. At idle, the carb can keep up but under load, it's sucking in too much air somewhere. I'd check the lines as well as the carb. Pinhole leaks are the worst.....
Ugh, for a pretty untechnical guy like me, that sounds like a nightmare. So I should look closely at all the tubes and hoses? Any best practices for troubleshooting that type of thing?
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Old 05-29-2015, 10:56 AM   #5
Ebuddy   Ebuddy is offline
 
Join Date: Jun 2013
Location: Minnesota
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Well… It depends upon how “untechnical” you are. ;-)

Rather than recreating the wheel, here’s a site that has some good information:

http://www.mopedarmy.com/wiki/Vacuum_leak

I’d just stick with Method 1 to start.

After that, I’d replace all of the vacuum and fuel lines anyhow. This is a cheap, easy task that should probably be done on a ’06 if it’s never been done before.

Failing that, I’d start looking at the petcock/fuel pump, auto enricher (if equipped) and the carburetor (in that order).

Best to try one at a time so as to not be overwhelmed.

If after all that there’s still an issue, perhaps the valves need to be adjusted.



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Old 06-15-2015, 01:24 AM   #6
UltraLife   UltraLife is offline
 
Join Date: May 2015
Location: Seattle, WA
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Super helpful, thanks! I am going to try this out with a friend soon!

Quote:
Originally Posted by Ebuddy View Post
Well… It depends upon how “untechnical” you are. ;-)

Rather than recreating the wheel, here’s a site that has some good information:

http://www.mopedarmy.com/wiki/Vacuum_leak

I’d just stick with Method 1 to start.

After that, I’d replace all of the vacuum and fuel lines anyhow. This is a cheap, easy task that should probably be done on a ’06 if it’s never been done before.

Failing that, I’d start looking at the petcock/fuel pump, auto enricher (if equipped) and the carburetor (in that order).

Best to try one at a time so as to not be overwhelmed.

If after all that there’s still an issue, perhaps the valves need to be adjusted.
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