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metz1234 08-14-2018 08:08 PM

Bogging while turning
New to forum today...2003 Xlt 800 from slow idle Bogging bad while turning and slight hesitation going straight from dead stop. Changed plugs first, Rebuilt carbs still having the problem. Runs great all other times compression is about 100 on both cylinders, also drained all gas during carb rebuild and changed tank vent due to pressure build up. Any help would be greatly appreciated.

rodsatheart 08-15-2018 06:28 AM

The tank does build pressure when not used and in the sun. The vent lets air in but not out. 100psi is low. Should be closer to 140ish. When you rebuilt the carbs, did you reuse the old needle springs ? Did you set the mixture screws back to factory settings ?

metz1234 08-15-2018 10:15 AM

Does it build enough presssure to blow the cap out of your hand and break the chain?
I read on here not to use the new spring so I didn't on the needle in the carb sort of like a regular float needle. These were mike I carb kits. The only thing I didn't rebuild was the small pump on the top of the front carb and was thinking of doing that next not sure what that one does. I did put the carb back to factory setting and I think it was 1/2 turn out on one and 2 out on the other for both carbs

metz1234 08-15-2018 10:17 AM

Mikuni not mike spell check got me

metz1234 08-15-2018 10:19 AM

Were you talking about high and low speed needles and springs? If so kit didn't come with that I cleaned and put back

metz1234 08-16-2018 12:52 PM

anyone have any ideas on what the problem is and what does the small pump on top of the front carb do?

Dave in DE 08-16-2018 08:13 PM


Originally Posted by metz1234 (Post 7089015)
anyone have any ideas on what the problem is and what does the small pump on top of the front carb do?

Rods was asking if you used your old spring from your needle and seat valve inside the carb?
Your problem could be your accelerator pump. Witch is the small pump on top of the first carb. You'll need a new diaphragm and make sure the nozzles in both carbs are clear and clean. They tend to get corroded. You can find the diaphragm at SBT.

rodsatheart 08-16-2018 08:25 PM

There are screws on the side of the carbs. Did ou mess with them, and if so, did you put them back to exactly the setting they were in ?
Dave's right on the rest.

metz1234 08-17-2018 06:46 AM

High and low speed jets were put back exactly and the nozzles were clean I will order diaphram. So should I change springs on needle inside carb while I have it Apart?

Thanks for the help

Dave in DE 08-17-2018 08:14 AM

No. It's best to use old springs. Just make sure there set correctly.

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