94 SL 750 fuel delivery issue?

[The Tim]

94 SL750. Carbs rebuilt last season. SBT motor. Removed choke plates, primer kit. New 3 outlet pump. New gas

Took it out 3 times earlier this summer and it ran great. The next time out it would lose top rpm after it would warm up. Took carbs off and the internal filters had some junk in them. Cleaned them out and put it back together. Took it out again and everything seemed good for the first 20 mins. Then out of nowhere I lost bottom end power.
If I pull the throttle wide open from idle it would only go about 3000rpm and stay there, no matter how long I held it wide open. Tried adjusting low speed screws, didn’t change. Tried new plugs, nothing. I let it sit for 1 hr and tried it again, didn’t change. The only ways to get it back up into the high speed circuit would to VERY slowly pull the throttle till it got past the low speed circuit. Once it hit the high speed circuit it took off like normal. Or during the stall hitting the primer once would make it take off like it should. So this tells me its a fuel delivery problem? I went home and check for any air leaks in the fuel lines/gas tank, none. Have a new 3 outlet pump, took apart and checked it anyway, looked good. Checked compression...good.

Could a bad seal/gaskets at base of carbs cause something like this? Any ideas before I go and pull the carbs off again would be great.

Thanks
Tim

[Technical Support]

Real easy...your carbs got clogged and you didn't clean out the source, the fuel tank/lines, you just cleaned the filters.

Mop out your tank, verify the lines are clean and rebuild your carbs again, making sure to spray them out well.

[The Tim]

Possible but I completely tore this machine down to nothing and started over last summer. Perfectly clean gas tank, all new lines. The clear inline filter shows no junk in it. The only the reason the internal filters where dirty was because of the many Pop Off pressure test and low speed jet changes to adjust for new flame arrest. I didn’t bother cleaning the filter side after I did all these adjustments/test, my stupid fault there. When I took carbs off this last time I completely cleaned them again to be safe. Knowing this is there anything else you can think of?

If not ill just have to take them off again and see [img]graemlins/crying.gif[/img]

Thanks
Tim

[Technical Support]

REjetting and changing you pop off does not intruduce debris unless you put it there. I unerstand you did it last year, but obviously there is more there now. The main filter doesn't trap doo-doo.

[Hannibal_Smith]

Re: 94 SL 750 fuel delivery issue?

i just got a polaris sl 750 and im not getting fuel from the tank im thinkin i have a bad fuel pump but im not sure where it is or what to do so any advise would be great.

[Technical Support]

Re: 94 SL 750 fuel delivery issue?

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