97 sea doo backfiring threw carbs after rebuild

[aokroi]

So I picked up a 97 Seadoo Xp last year from a buddy. The motor only has about 20 hours on it. When I first put it in the water I noticed it was very hard to start once I got it started after choking it for a few minutes it would run great and then die every so often and we have to choke again. So this winter I ordered car kits from SBT installed them. Still continue to start hard so I ordered a new rotary valve and cover. Installed that with all new fuel lines and it still seems like I'm losing Prime after it sits for a while. But when I do have it running it doesn't want to wind out more than 30 miles an hour and will backfire through carbs. All the Jets are set where they're supposed to be

 

[JeremyD615]

The SBT carb kits are your issue. Order the “Back to OEM” kits from OSD and your problems will be gone... Also, if you used the spring from the SBT kit on your needle lever arm, go ahead and use the one in the OEM kit...

 

[aokroi]

That's what I did the first time and as soon as I would start it up it would immediately flood the motor. So that's why I switched to SBT

 

[aokroi]

Last year this thing ran great just continue to die from time to time and was hard starting now after going through the carbs and putting a new rotary valve in. It doesn't want to Prime its own fuel after a day and backfires through the carbs once it's running it will sit and idle all day long just no power on the top end

 

[aokroi]

If the pop off pressure was too high could that cause an issue

 

[JeremyD615]

If it was giving you trouble with the OEM carb kit, then you’ve either got something installed wrong in there, or you didn’t get the internal ports clean in the carb... Either way, you need to open them back up and get the SBT stuff out of the carbs and OEM back in. You’ll never get it sorted out otherwise... Did you replace the needles and seats when you did the carbs?

 

[aokroi]

Yes I did

 

[JeremyD615]

Well unfortunately you’ve got to do the carb again... People argue about not wanting to change out brand new carb parts all the time, but in almost 100% of cases, the aftermarket stuff is causing a problem... It’s much better to bite the bullet now rather than spend the next month buying different parts and trying different things only to wind up digging back into the carbs later...