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Discussion Starter · #1 ·
Ever since I put the Yoshi duals on, it's been backfiring on decel under load in all ranges---Have played with a/f screw changed jetting up and down---Have never been able to fix it---It starts good and runs strong---I did find some leaks in the exhaust connections but way back by muffler.

Can't get to the leaks so I just pulled off the whole system and put on another brand new set of duals---Pro Circuits---And crap---It backfires worse with them on and there is no exhaust leak anywhere.

The only 2 things I haven't looked at is the pilots to see if they are dirty or clogged or checked valve clearance---I've held off on the valves as so many have posted up what a bucket of worms they opened---Actually R&R'ing the the air filter box is for some reason more intimidating to me than the valves.

If you guys have any other suggestions please post up---I'm sure if I mess with the valves I'll be back on here whining about something:p:p

Kenny
 

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How many turns out are your fuel screws?
 

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Discussion Starter · #3 ·

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I'd check the valves anyway if you feel you can just to eliminate one more thing.
 

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I had the same issue I got 42 pilots and was able to tune it out now I never have any popping.
 

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It's probably lean and needs bigger pilots as others have pointed out, but check the valve clearance anyway. It's part of scheduled maintenance and needs to be done.
 

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Discussion Starter · #8 ·
Appreciate the posts---If I change out the pilots from #40's to #42's, (most of the threads recommend this when UPP's are added but not for stock), if it's too much/too rich how will I know in the seat---What should be a good indicator that it needs to go back to #40's.

Today is Wedn. and I might be leaving tomorrow nite to do about 150 miles of riding---I don't want to do anything that will screw it up---As it starts fine and runs well except for constantly backing off on decel---I love the rumbling sound of it but can't be any good for it to run this way---Also the rear exhaust has been showing black carbon/soot lately, (at 182/185)--I don't have any other jets, but was thinking of trying to change the front to the rear, (185/182), just to see if it does anything noticable.

When I get back will definitely look at valve clearance too---Thanks

Kenny
 
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