Still popping after much maintenance...

[Wayne S]

I have a `98 Standard with 34K on it and recently have experienced popping through the exhaust (right side primarily) during static accelleration (around 1400-2000 rpm) and during decelleration (compression braking).

I have replaced all vacuum hoses, the intake o-rings and made sure all rubber intake couplelings and clamps were installed correctly and tight.

I also replace the exhaust gaskets.

Can carb problems cause popping?  I've ran Sea Foam thorough it and I'm temped to run a large can of Techron through it on the next fill up.

Any suggestion or recommendations are welcome.

[FLATSIX]

I have a '97 standard and had also the popping.

Now I finally got rid of it and I think there were 2 causes :

1) my left exhaustbolts did I tighten I don't know how many times, but each time after a ride I checked the left bolts and could tighten them more till the 7th or 8th time that it was finally O.K.
I did it with a torque-meter. So if you install new gaskets for exhaust, please check and tighten each time till they are finally good!!

2) did the carb synchronisation many times now, better cannot - I cannot, but they are very close when machine hot - this can also play to get rid of poppop I think.

This is my experience, I am glad without the pop 

[Patrick]

From your post it appears that you may have some carburetor varnish .. Don't give up with just one try with the sea-foam.. Depending on how heavy your 'dosage' was it may take couple tank fulls of good heavy doses to clean things up..

[Medic]

Just fixed this one myself as well...had already had bike Desmogged.....one of two things fixed it

1) I rebuilt the fuel petcock
2) I dropped the bowls on the carbs...cleaned them..and switched out the stock 35 slow jets to 38's. I think the old slows were clogged (seems a standard problem)

I had already ran through several cans of seafoam as well without luck. My petcock looked good when I broke her down, but already had the rebuild kit so did it anyway. My money is on the slow jets being clogged, most folks have switched to 38slows.

[Wayne S]

Thanks for the quick replies.  I'll double check for intake vacuum and exhaust header leaks and I'll run a large bottle of Techron through it on my next fill up.

If that doesn't fix it, I'll pull the float bowls and change the 35's to 38's.  I really don't want to have to do this, but you gotta do what ya gotta do.

Thanks again.

Wayne S

[98valk]

popping on decel is always a lean condition. ethanol in the fuel will cause a lean condition that wasn't there before ethanol.
Open up your carb mixture screws 1/2 turn at a time until it stops. all carbs screws should be the same. If u have to turn them out 4 1/2 turns then u need larger pilot jets. Unless the bike is sitting for a yr the jets will not clog. I do not know who started this thing about clogged 35s, a 38 can clog just the same. My bike sat for over a yr, only put 2k on it, never drained the bowls and no clogs.
I have posted the ingredients of seafoam before, its mostly alcohol which is already in the fuel. higher alcohol % in fuel more leaness. Why do u think the epa, govt and enviromentalists waited for all vehicles to be fuel injected to implement their plan of ethanol?