rx7500hpt2 Posted December 15, 2003 Report Posted December 15, 2003 I put these on with 145 mains and 38 pilots. The problem is the air screw. If the air screw is completely closed it runs perfect and I can get it to idle with the idle screws. but if I ever so slightly open up the air screws it starts to idle high and idles down weird. The more I turn them out the worse it gets, 1 to 2 turns is usually the best for any other bike I have but with these carbs its horrible. Quote
rx7500hpt2 Posted December 15, 2003 Author Report Posted December 15, 2003 Oh ya even with the idle screws closed it will idle high with the air screws opened. I don't have any air leaks. Quote
H300F Posted December 17, 2003 Report Posted December 17, 2003 im guesing you need to go bigger on your pilots Quote
Dragg-on Posted December 17, 2003 Report Posted December 17, 2003 try a 45p with 3/4-1 turn out on the screws and work from there Quote
rx7500hpt2 Posted December 17, 2003 Author Report Posted December 17, 2003 I went up to the 45p 1 turn out on the air screw and it still idles high. I thought their would be a big difference going from a 38 to 45. I guess I'll throw 50's in. Quote
Dragg-on Posted December 18, 2003 Report Posted December 18, 2003 I would first take off the air filter and make sure both slides are low and come up evenly. try going w/ a 55p and you should be able to turn the screw out maybe 1.5-2 turns, hopefully. like I said if your slides are too high bringing them down will lessen the idle. there should be an adjustment at the thumb throttle that will bring down both slides. Quote
rx7500hpt2 Posted December 18, 2003 Author Report Posted December 18, 2003 Thats what I mean man the the slides are all the way closed. I put a little slack in the cable and the idle screws are backed off, the slides are diffinitely all the way down. The only air the motor is getting when it idles is from the air screws. If I close the air screws it will die. Quote
Dragg-on Posted December 18, 2003 Report Posted December 18, 2003 if you close the air screws then it dies? so what happens if you open them slightly? i dont think its OK for the slides to be completely shut. just up a bit. try a richer Pilot and let me know. Quote
rx7500hpt2 Posted December 18, 2003 Author Report Posted December 18, 2003 I think I figured it out. I need stiffer springs on the slides. The high idle is the slides feathering slightly open. When I twist the throttle sometimes they will feather and sometimes they'll fully close. I took the slides off and slide them into the carb and they move freely, no sticky spot. My throttle cable is brand new and moves freely. So I've got to find some stiffer springs. Who sells spings? Quote
Banchetta Posted December 18, 2003 Report Posted December 18, 2003 I was going to say that either your throttle was stuck open or you had an air leak...A lean pilot will not make your shee rev out of control....One of the ways to dial in the air screws and pilots is to find the highest idle you can get from adjustments and turn the idle back down w/ the idle knob... Quote
Dragg-on Posted December 19, 2003 Report Posted December 19, 2003 OH forgot to mention, when I 1st bought a used set of 28pwk, they had aluminium slides that were worn and caused an air leak, so I called carb parts wherehouse and they recommend I switch to the chrome slides, they said this was a common problem. they were costy but fixed my problem, I recommend you ask them what can be done about your situation, I had my doubts, but it worked! Quote
rx7500hpt2 Posted December 19, 2003 Author Report Posted December 19, 2003 Mine are worn and probably need to be replaced. Another bad ebay buy. Sudco wants $61 a piece for chromes. The stock carbs don't look so bad after all. Quote
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