2002 blaster, spits a little bit under load in higher rpm...

[mastuhblastuh]

just bought a blaster the other day and i immediately knew that the TORS system was bad... so i removed it. after that, i took for a test drive and found that the quad would bog down really bad under a load... well, as of now, i fiddled with the carb long enough to get it to run a lot better! however, it still seems to bog a bit under a load but will rev in neutral awesome! i did take the carb apart and cleaned it. float seemed like it was where it should be however i did not see if it would float in gas by its self... another odd thing i noticed is that my jets do not have any markings on them but i was told the carb was new.
later today im going to try n fashion a leak down test and see what happens there... but im curious to see if anyone has had a similar experience and what they did to fix it.. the only real modification i did to the carb was play with the air/fuel mix and that seemed to help quite a bit.
any and all input is greatly appreciated!

 

[Blaaster]

The air screw is primarily to set the idle speed and transition onto the needle.

Above 1/4 throttle the air screw has little or no affect on the Air fuel ratio.

If the jets are unmarked and in a new carb the possibilities are that they are not the ones to suit your mods.

You should set the float level as per specs and do a plug chop to see just where the jetting is at.

 

[mastuhblastuh]

I see. The reason i bring up the air screw is because it ran so much better after i played with it

 

[best]

Many of the cheap Chinese carbs do not have values on the jets.
You can compare them to known jets with a needle.
These carbs often bring constant headaches.

Buy a set of jets and follow Blaaster's advice.

Steve

 

[mastuhblastuh]

so.. i may have found out why it wasnt running very good at first... the guy i bought it from wasnt very thorough in his preliminary inspection.. and i also failed to notice this.. but the oil injection res was blocked off and he said it worked so he just ran regular gas -___- granted, it didnt run for very long at all and he swears that with oil injected engines he always mixed a little bit of oil with his gas just for redundancy but i mixed fresh gas and shortly after starting runnin a lot better..

side note* for the 2nd night in a row i failed with my leak down test.. first time i didnt get the right pump for the fitting i was using and last night the "hose" clamp snapped and i had no way to seal it tight... granted the carbs off, i will verify float level, and see if i can get a buddy of mine to maybe spare me a set of jets for assurance! thanks for the help so far guys.. im sure youl hear from me again! lol

 

[mastuhblastuh]

The air screw is primarily to set the idle speed and transition onto the needle.

Above 1/4 throttle the air screw has little or no affect on the Air fuel ratio.

If the jets are unmarked and in a new carb the possibilities are that they are not the ones to suit your mods.

You should set the float level as per specs and do a plug chop to see just where the jetting is at.

totally forgot to mention blaaster is that as far as i can tell there are no mods besides a silencer on the bike! not that i like cheesy parts but if the bikes stock do you still think the jetting could be off? also, il be bringing the socket i need to get the plug out home today. il let you know what it looks like! last thing the guy i bought it from also said that the stock plug requires an R8 is what i believe he said... but he put in an R9? do those numbers make sense to you?!

 

[Blaaster]

BR8es or B8es is what is needed,, the 9 heat range is too cold and will easily be fouled.

 

[mastuhblastuh]

Good. Got a new plug last night and had the float set by a tech at jmp cycle. im hoping this plug is the problem... he told me he had put an r9 in his bike and it caused it to spit a lot so before i get to carried away on parts im going to give that a whirl. In the process of deleting wires for oil pump and tors and then im going to put her back together and let it rip. I also noticed that the air filter was an absolute mess... caked with mud so im aure that couldnt of helped. For temp purposes i soaked it n gas a couple times and blew it out so im hoping the combo of all the little tweeks will help!