Wassup350 Posted July 28, 2004 Report Posted July 28, 2004 (edited) I just installed my noss machine cylinder heads w/ 20cc domes, then it was running awesome for a while and really ripped but then all of a sudden just died. I looked at my sparkplugs before and they were just about perfect. Now after i installed the head they are a little blackish. I noticed when i checked to see if they had spark that it wouldnt spark but when i turn the handle bars itsparks. So my guess it's the electrical, or it may have to do with having a new head but i doubt thats the case. Also i checked the compression ands its around 170ish or so. Is this too high to run 94 octane or will i need some better shit?? Edited July 28, 2004 by Wassup350 Quote
dlnoss Posted July 28, 2004 Report Posted July 28, 2004 You are 'on the edge' with that compression and 94 octane, and too much if the timing is advanced. I'd probably bump up the octane a little. Quote
jadaven Posted July 28, 2004 Report Posted July 28, 2004 Im running 20cc domes with half race gas and half premium. I wouldnt even think of doin it on 94 alone. Quote
Wassup350 Posted July 28, 2004 Author Report Posted July 28, 2004 Hmmm well i dont know if i want to give up any compression because it really ripps now on the low end. Where can i get some race fuel?? Will octane booster from a gas station work till i get some high octane fuel or no? Quote
ledofthezep Posted July 28, 2004 Report Posted July 28, 2004 Im running 20cc domes with half race gas and half premium.I wouldnt even think of doin it on 94 alone. No shit! Definately man, I can imagine it being anything else...may be why your plugs look a little rich, did you dick with your jetting at all? YOu could either change out domes or go & get some race gas and at least mix it half/half... Quote
Wassup350 Posted July 28, 2004 Author Report Posted July 28, 2004 Hmmm i guess ill just go with getting race fuel, only problem i have right now is where to get it. I figure its worth it to get more compression out of it and pay a little more since ill be racing mx. Hopefully i didnt do any engine damage all ready but it still has good compression so im not too worried ill just wait till i get some race fuel. Thanks for the suggestions. Quote
BdBanshee Posted July 28, 2004 Report Posted July 28, 2004 I noticed when i checked to see if they had spark that it wouldnt spark but when i turn the handle bars itsparks. So my guess it's the electrical, or it may have to do with having a new head but i doubt thats the case. Also i checked the compression ands its around 170ish or so. Is this too high to run 94 octane or will i need some better shit?? I have had one of the wires from the key switch break inside the insulation before and kill the motor when I turn the bars. Straighten them back out and it would start and run just fine. Sounds like it might be your problem too. I have run 170-175 pounds of compression in my Banshee for the last 15 years with no problems on 91-93 octane with the timing advanced 5 degrees. That doesn't mean you won't have problems, but many people don't. Quote
Wassup350 Posted July 28, 2004 Author Report Posted July 28, 2004 I have had one of the wires from the key switch break inside the insulation before and kill the motor when I turn the bars. Straighten them back out and it would start and run just fine. Sounds like it might be your problem too. I have run 170-175 pounds of compression in my Banshee for the last 15 years with no problems on 91-93 octane with the timing advanced 5 degrees. That doesn't mean you won't have problems, but many people don't. My key switch aint mounted on the handle bars just the tether switch, i thought that could be the problem but then i cut the 2 wires and it still stalled. It stalls when i rev it up high then it just kinda dies, im not sure how the heck it happens but i guess tommorow ill figure it out when i have the energy to get off the couch. Quote
DirtRider Posted July 28, 2004 Report Posted July 28, 2004 what does racing gas do mixed with 93 octane? does it make the engine run cooler or something? Quote
Minkia38 Posted July 28, 2004 Report Posted July 28, 2004 more compression needs more octane - otherwise your engine will "ping" = loss of power = bad = rebuild me! where to get race gas? just go to ANY airport - local or big they all sell Aviator Fuel - usually 100+ octane works great, and not too expensive - mine here is about 2.60 a gallon, or 60 cents more than regular 87 gas Quote
Wassup350 Posted July 29, 2004 Author Report Posted July 29, 2004 THats awesome because there is a local airport about 5 miles from here!!! thanks a lot for the help, i hope i can git r runnin right, i didnt hear any pinging so i dont think i had any detonation problems yet but i dont want to risk it. Quote
Meat Posted July 29, 2004 Report Posted July 29, 2004 iv been runnin 165 psi with 20cc domes for about a year now and I run 94 sunoco. I havent experienced any pinging yet. Iv ran it with +2 and +4 timing and still didnt get her to detonate. Im also ported so forget what I just said Quote
Wassup350 Posted July 29, 2004 Author Report Posted July 29, 2004 Update, i just got race fuel and it still dies down. It seems to run real strong and revs nice but then when i rev it high a little it just kinda cuts out. So my guess is i frigged somethin with the electrical when i put the gas tank back on but went through and i dont see any shorts so this is starting to frustrate me. I just hope i can get the thing going by this weekend so i can ride. has anyone ever had it die on them after installing heads because im not sure if thats the cause or if its the electrical?? Quote
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