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 Post subject: Rough running bike carbs
PostPosted: Mon Feb 09, 2015 12:04 pm 
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Joined: Wed Jul 10, 2013 9:41 pm
Posts: 51
Location: York
Finally got my zetec install started yesterday :D Was a bit rough & lumpy. Started again this morning after a couple of goes. Runs lumpy on tickover & pops back through no's 3 &4. When I open the throttle it backfires through 3&4 then smooths out.
Question is why is it poping & banging through 3&4 only? And why the lumpy tickover?
Only on edis at the mo & have checked HT lead are on right. Timing was checked double checked before install.
Thanks Mark


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PostPosted: Mon Feb 09, 2015 1:38 pm 
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Joined: Wed Sep 05, 2007 5:48 pm
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Location: Northamptonshire
Check for air leaks too

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PostPosted: Mon Feb 09, 2015 1:55 pm 
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Will do. Anywhere in particular?


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PostPosted: Mon Feb 09, 2015 4:33 pm 
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What gasket you using between inlet manifold to head mine leaked there so I bought a thicker type from FastDan on here.

Also check around the fluro tubes which connect the carbs to the inlet.

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PostPosted: Fri Feb 13, 2015 1:15 am 
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Also if you have had the plastic tops off the carbs to do the jetting if you don't get the rubber seals back in place properly they draw air here as well.


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PostPosted: Fri Feb 13, 2015 9:47 am 
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I've had one top off, so will check that its refitted properly.
I've re-checked all the jets for blockages again & checked the fitment of the fluro tubes.
Need to refit back on the car now.


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PostPosted: Fri Feb 13, 2015 11:34 am 
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Might need to be balanced. Also check the floats are working as they should be.


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PostPosted: Thu Feb 19, 2015 10:56 am 
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Joined: Wed Jul 10, 2013 9:41 pm
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Location: York
Thanks for all your help. Done all of the above & now got the car running on Megajolt. Just need to get it to Boggs for final set-up.
Just one other thing to check is I have a gentle popping coming from carb no.3 at idle. Could this be a sticking valve? If so will it eventually clear its self or do I need to take further action? I'm using 5/30 oil.


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PostPosted: Thu Feb 19, 2015 6:49 pm 
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Joined: Fri Jul 06, 2007 10:53 pm
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Location: Uxbridge
Sounds like, your carbs just need setting up.

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