My bike runs lumpy for first 5 mins.

N

nightwalker21492

New member
Hi,good morning.
I own a 1990 gsx750f (slingshot).It starts fine but always for the first 5 mins or 3-4 miles it runs lumpy,it seems like its firing on 2 or 3 cylinders with full power coming and going after this time everything is great and is as it should be,although if i let it warm up for 10 mins on tick over it doesnt seem to do it.

Thanks
Colonso.
 
What are you doing with the choke? This may be a simple matter of leaving the choke partly ON for the first few minutes/miles.......just enough so that it is a tad above normal idle speed.

Then there is the plugs and the gas. Change the plugs if you haven't lately and run some carb cleaner through with the gas; Berryman's B12 Chemtool is good.
 
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