cp tech ping with 100oct help please - Yamaha Raptor Forum
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post #1 of 51 (permalink) Old 09-15-2012, 09:42 PM Thread Starter
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cp tech ping with 100oct help please

i have a pinging/tinging sound coming from the motor only under hard accleration seems to be more noticable in 3rd and 4th gear. i am running 100 octane and have a cp tech 11.5, hot cam 2, 5mm stroker, full yoshi system, k an n filter intake and no lid so i dont really think it is a octane problem so what else could it be, i only hear it under hard accleration ive tried lugging it on hills to try to put a big load on but nothing, could it be running hot, havent had a light on or anything but did loose my coolant overflow cap awhile back and now it is just covered not sealed. help please this is kind of got me worried?
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post #2 of 51 (permalink) Old 09-17-2012, 09:22 AM Thread Starter
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What vp racing fuel does everybody run and have y'all heard of renegade race fuel that's what is available around where live and I beleave all that is available in unleaded is 102 oct and $60 for 5 gallons I've been using 100 octane from the bp station and on loose gravel when I nail it I get ping ping ping in 3rd and fourth I am also wondering if the octane is my problem I should be around 12.2 comp running 100 octane and 400 ft above sea level? Any ideas through out?
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post #3 of 51 (permalink) Old 09-18-2012, 08:52 AM
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I had pinging also with my tech piston when I ran 93, but only under wide open throttle. I started mixing 100 with 93 50/50 mix and it stopped. If you have an airport near you you can get 100LL there thats what I do around 6.25 a gallon. Good luck.
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post #4 of 51 (permalink) Old 09-18-2012, 09:08 AM
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You can get 110 at any of the stations in the link, I don't know exactly where you are at, but the link is by your zip. I mix 110 and premium 50/50. if that don't work for you...you have other issues.

http://www.racegas.com/fuelfinder

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post #5 of 51 (permalink) Old 09-18-2012, 10:58 AM
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We use 100 octane with our Tech 14:1 piston. If your getting detonation with 100 octane on our pump gas piston I would say there is an issue with the fuel you are running.

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post #6 of 51 (permalink) Old 09-18-2012, 04:06 PM
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Have you had your bike dyno-tuned? If your tuning isn't good then there is a possibility with that.


2007 700-
11:1 Wiseco piston, +5 HR crank, Lucky700R ported head, HDD5050 cam, +3TB, DMC Force IV duals, MSD Blaster FI controller, UNI pod filters, ITP Beadlock rims + more

2001 Raptor-
100.5mm 11:1 Wiseco piston, balanced crank, trail ported head, Ferrea valves, stage 2 HC, Barker duals, UNI pod filters + more

2007 pitbike-
150cc Lifan engine, 26mm Mikuni carb, 32mm custom stainless steel exhaust, 12" motard tires, working on LED
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post #7 of 51 (permalink) Old 09-18-2012, 05:08 PM Thread Starter
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No I have not had it dynod yet I have a oc 3 and am running a dynod map for my exact setup, I had alot of trouble finding a good map but when I tryed this one the diff. It made was amazing and my plug looks pretty good but I do know it can't be 100% because every bike is not the same I am wanting to get a pc5 with timing in a few weeks and possibly auto tune cause I'm not done modding I am gonna get a5050 cam and port work so I don't want to pay to dyno tune 2-3 times, what would cause detenation in a map? Lean at wide open throttle or rich, I'm am getting it when I run unleaded 100 octane that ibuy out of the pump at the gas station that's about thirt minutes away from me. I do have an airport that is 4 miles from my house and cheaper I didn't know if I could run leaded fuel or not? So I can? I also found out I can get renegade race fuel locally that is 102 unleaded or 110 leaded I beleave anybody ever heard of that or use it it's about $55-65 for five gallons. I had the same setup before just without the stroker crank and think I remember it pinging only a time or to,(diff map) I know the crank raises he comp and now it does it bad when at full throttle. What do you guys think cheap fuel I maybe need to run some of know good quality or another, but what could it be, ?? Sorry to ramble
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post #8 of 51 (permalink) Old 09-18-2012, 06:31 PM
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If the fuel was sitting a long time it could degrade some. IMO I wouldn't run "gas" from an airport as I'm pretty sure its rated differently than normal gas. Not sure what in the tuning makes it detonate.


2007 700-
11:1 Wiseco piston, +5 HR crank, Lucky700R ported head, HDD5050 cam, +3TB, DMC Force IV duals, MSD Blaster FI controller, UNI pod filters, ITP Beadlock rims + more

2001 Raptor-
100.5mm 11:1 Wiseco piston, balanced crank, trail ported head, Ferrea valves, stage 2 HC, Barker duals, UNI pod filters + more

2007 pitbike-
150cc Lifan engine, 26mm Mikuni carb, 32mm custom stainless steel exhaust, 12" motard tires, working on LED
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post #9 of 51 (permalink) Old 09-19-2012, 05:57 AM Thread Starter
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No fuel was daily fresh I buying there for a year now but I don't know what brand it is I don't know if bp actually makes 100 or if it is another brand so u think I need ty try renegade or vp?
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post #10 of 51 (permalink) Old 09-19-2012, 06:03 AM Thread Starter
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And would over octane cause this? Would getting a pc5 with timing control?
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