Genuine air filter, or pattern part ??

[Anonymous]

I have replaced my rotten, crumbling air filter on my 78 GS750 with a pattern part. Same size, shape etc but not the genuine Suzuki part. Could this be contributing to a lumpy idle ? It seems to run fine, but my word it just will not idle smoothly.

 

[Anonymous]

If it's the foam filter like mine, I can't see how it would affect your engine running. Pattern foam of similar density should be just the same as Suzuki foam - only much much cheaper to but of course.

At the risk of stating the obvious :

the foam needs to be oiled to keep moisture out (engine oil is fine). If you didn't oil it, more air can be drawn in and the engine may be a bit lean at idle.

make sure the filter element is properly in position and the cover is airtight (some grease will seal it).

if you had the rubber inlets between carb or airbox off or just loosened, check there'll all securely in place and the clips tightened. I once traced a very nasty idle to those loose clips - after working on the carbs, I'd driven away and forgot to do them all up again. Duh!

Hope this helps.

 

[Anonymous]

If it's the foam filter like mine, I can't see how it would affect your engine running. Pattern foam of similar density should be just the same as Suzuki foam - only much much cheaper to but of course.

At the risk of stating the obvious :

the foam needs to be oiled to keep moisture out (engine oil is fine). If you didn't oil it, more air can be drawn in and the engine may be a bit lean at idle.

make sure the filter element is properly in position and the cover is airtight (some grease will seal it).

if you had the rubber inlets between carb or airbox off or just loosened, check there'll all securely in place and the clips tightened. I once traced a very nasty idle to those loose clips - after working on the carbs, I'd driven away and forgot to do them all up again. Duh!

Hope this helps.

I have a K@n and it runs the same with the new or old filter.....Must be something else

 

[focus frenzy]

I to have a K&N filter on mine, but I agree, check the air cleaner to carburator boots it is easy to not get them on all the way and it will mes with the air flow into the problematic carb. causing ridability problems.