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02-19-2008
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 RM 265kit, questions I just recieved my piston and cylinder back from Eric Gorr(great guy and does great work) and have put it all back together. I chose the low to mid powerband and pump gas. I just have a few questions. Since I picked low to mid powerband does that mean that I actually lost the top end? The only reason I ask this is because my friend has a 07 yzf250r and he can smoke me now(when I had the stock motor in there I could stay right next to him the entire way, and it had over 100hrs on the top end)... I think I am going to do a leakdown test but I am just a little confused I am currently trying to get it jetted correctly. Any help on this would be appreciated... Stock exhaust and intake with 265 kit....      |
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02-19-2008
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| Thats a tough question with little info to go off. What carb is on it? What are the jets in the carb now? What is the bike doing when you get in the top end
__________________ 86 Honda 310R Power Valve Paul Turner Eliminator pipe 39mm Sudco racing carb 215psi 110 octane 310esr p/v Ported by Neil at C-Leigh Racing +4 Durablue axle +2 Burgard A-arms 87 Quadzilla Lonestar custom swingarm Lonestar axecaliber axle Lonestar steering stem Powder coated frame Custom Paint 42.5mm mikuni Alky carb (soon to be 48mm Packard Lectron) Marvin Shaw suspension LOTS OF CHROME Trinity Drag port ( I know its Trinity, but do you want to race it ?) CPI oof drag pipe am I forgetting anything? hmmmm   Never argue with an idiot. They'll just drag you down to their level, and beat you with experience! |
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02-19-2008
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| Basically it is a 2000 with a stock carb(not sure about stock jetting)...The bottom of the powerband is good, and when I get to the middle or top of the powerband it doesnt get any stronger at all, I can go faster shifting at the very bottom of the RPM range....It just doesnt seem right.... I am sorry, I do not have the actual specs of the carb (jet numbers). I will write them down this afternoon.... The plug looks like it has some carbon buildup(not super clean) but it is a light grey color.... I know that the motor has a compression 120psi.... |
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02-19-2008
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| One other question, the crankcase/tranny has to be air tight right for the bike to run properly, correct? That is what a leakdown test is supposed to confirm..? Chris |
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02-19-2008
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| Well 120 compression is no good should be in the 160-170 range. Are you sure you held the throttle wide open while you kicked to get that number. What I meant about it running in the top end was, does it cut out and smoke a litte more or is it popping through the exauhst. If so those are jetting issues. If your comp really is only 120 (which makes no sense on a fresh motor) that probably is the problem. Do you have a aftermarket head gasket on it. If so is it thicker than the stock gaskets?
__________________ 86 Honda 310R Power Valve Paul Turner Eliminator pipe 39mm Sudco racing carb 215psi 110 octane 310esr p/v Ported by Neil at C-Leigh Racing +4 Durablue axle +2 Burgard A-arms 87 Quadzilla Lonestar custom swingarm Lonestar axecaliber axle Lonestar steering stem Powder coated frame Custom Paint 42.5mm mikuni Alky carb (soon to be 48mm Packard Lectron) Marvin Shaw suspension LOTS OF CHROME Trinity Drag port ( I know its Trinity, but do you want to race it ?) CPI oof drag pipe am I forgetting anything? hmmmm Never argue with an idiot. They'll just drag you down to their level, and beat you with experience! |
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02-19-2008
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| Quote:
If you had an air leak, it would rev to the moon as soon as you started it
__________________ 86 Honda 310R Power Valve Paul Turner Eliminator pipe 39mm Sudco racing carb 215psi 110 octane 310esr p/v Ported by Neil at C-Leigh Racing +4 Durablue axle +2 Burgard A-arms 87 Quadzilla Lonestar custom swingarm Lonestar axecaliber axle Lonestar steering stem Powder coated frame Custom Paint 42.5mm mikuni Alky carb (soon to be 48mm Packard Lectron) Marvin Shaw suspension LOTS OF CHROME Trinity Drag port ( I know its Trinity, but do you want to race it ?) CPI oof drag pipe am I forgetting anything? hmmmm Never argue with an idiot. They'll just drag you down to their level, and beat you with experience! |
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02-19-2008
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| 120 with the throttle closed.....I will check it again.... |
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02-19-2008
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| No aftermarket head gasket...All I know is that eric had to bore out the head a little to lower compression.....for the pump gas...... It does not smoke anymore at the top end, it actually seems to run fairly smooth at the top end, just not much power.... |
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02-19-2008
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| 130psi throttle open |
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02-19-2008
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| I take it you had Eric do some port work, if this is so & you haven't jetted since this could be your problem. If the engine is moving more air thru it, then when you get into the topend you may be starving it a little. I would do a plug check.
__________________ 1985 LT250R Quadracer Manufacture Date: 12-84 +8mm Hot Rod FloTek Drag/Dune port w/ Head Mod LA Sleeve STD Weisco Piston AAEN Pipe 1Dirracing Ported Reed Block w/ Secrets Keihin 39mm PWK Nology Pro Fire Coil & HotWires 7oz off FlyWheel Barnette Kevilar Clutch Kit UNI filter +2 +1 Chrome Burgard A-Arms +4 Chromoly Swingarm WORKS Fronts w/ Rezzys DuraBlue Rear Strut Billet Twin Row Carrier LSR Axcaliber +2 Axle & LSR Brake Hub "If your not scared, your not safe" |
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