carb balancing

Subject: carb balancing Tue Feb 01, 2011 10:23 am

I fitted a open exhaust on my 790cc bonnie,im not sure if this will affect the valves ,but it does pop a bit on revving, any info on this would be great.

Posts : 782 Join date : 2011-02-08 Location : Livingston

Hi Stevie, check your timing mate, backfiring through the carbs is sometimes a symptom that the valves are slightly open when the spark ignites.

Subject: thanks Wed Feb 09, 2011 9:27 am

cheers i know its not firing as it should im going to get it checked out by a bike mechanic near me asap,i dont have the tech stuff to check it myself and i dont want to cause any real damage to the valves by just ignoring it.

Posts : 2 Join date : 2011-03-15 Location : Worcestershire

The new bonnie has an air feed into the carb manifold, this is for emmisions, the reason it is popping is due to the mixture being too lean, with the open pipes, blank off the air pipe.

Subject: Too late Thu Mar 17, 2011 1:09 pm

I gave up,and refitted the original exhaust,it now runs sweet as a nut,however when my mot is done in mid april i'll refit the open exhaust and try again.cheers
stevie

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