660r2a400ex Posted January 31, 2008 Report Posted January 31, 2008 is this possible, i never jetted with pipes, the bike still runs great, seams to run a little leaner, but silencers are still smokin theres still signs of gas and oil on the plug, starts 1st or 2nd kick everytime ? why is this, pipes are fmf fattys with Q silensers, also has k&N Quote
yamaha04 Posted January 31, 2008 Report Posted January 31, 2008 if you had stock pipes before dont run the bike and jet it. if you just switched pipes and you had some aftermarket before then chances are the jetting is a little off. i would go to the fmf site figure out what jetting to use and do it either way. your taking a major risk right now and its probably not going to turn out good. you can also tell use what kinda mods you have and your elevation and someone should be able to get you straight on jetting Quote
dajogejr Posted January 31, 2008 Report Posted January 31, 2008 If you follow these instructions to a T, and the plugs are fine...ride on. http://www.dfn.com/benkaren/plugchop.html If the bike before pipes was jetted pig fat rich, that could be the case. I've NEVER heard or seen someone switch from stock pipes to aftermarket pipes and not be lean....on bone stock jetting. Sounds like you know you're lean....why chance it? Quote
jayzx10r Posted January 31, 2008 Report Posted January 31, 2008 (edited) is this possible, i never jetted with pipes, the bike still runs great, seams to run a little leaner, but silencers are still smokin theres still signs of gas and oil on the plug, starts 1st or 2nd kick everytime ? why is this, pipes are fmf fattys with Q silensers, also has k&NFMF website ballpark recommendation:http://fmfracing.com/techsupport/jettingcenter.aspx In fact, when the jetting is lean I think it usually runs the best it ever has....then seizes!! Edited January 31, 2008 by jayzx750 Quote
dajogejr Posted January 31, 2008 Report Posted January 31, 2008 FMF website ballpark recommendation:http://fmfracing.com/techsupport/jettingcenter.aspx In fact, when the jetting is lean I think it usually runs the best it ever has....then seizes!! A perfectly tuned bike is on the edge, albeit a very thin one, of being lean. That's when it makes the most power. I don't dance on that line...I keep my bike a little like me, a little fat, a little happy.... Quote
airtite Posted February 1, 2008 Report Posted February 1, 2008 A perfectly tuned bike is on the edge, albeit a very thin one, of being lean. That's when it makes the most power.I don't dance on that line...I keep my bike a little like me, a little fat, a little happy.... I had my shee dynoed and jetted I had a K&N filter with airbox etc but now I am running 2 pods straight off the carbs, do you guys think I am lean? Quote
dajogejr Posted February 1, 2008 Report Posted February 1, 2008 I had my shee dynoed and jetted I had a K&N filter with airbox etc but now I am running 2 pods straight off the carbs, do you guys think I am lean? Yes. Removing the airbox and slapping pods on there will need 1-3 bigger mains. You're not severely lean...but keep in mind, it only takes one bad revolution of the motor for shit to break....and at 9 to 10K RPM, that's a lot of spinning... Quote
KaosBanshee44 Posted February 1, 2008 Report Posted February 1, 2008 Rich is a bitch and Lean is mean! Quote
660r2a400ex Posted February 1, 2008 Author Report Posted February 1, 2008 i normally run my thumpers lean and never had a problem, but i'll fatten it up a lil, dont know much bout the shees but sounds like im driving a time bomb Quote
dajogejr Posted February 1, 2008 Report Posted February 1, 2008 You just have to remember the simple basics of the motor.... It gets ALL it's lubrication from the fuel. Lean fuel air means less lubrication, too. Your 4 poke gets fed oil a different way. Not that being lean is much better...but, I think you understand. Run a 4 poke out of fuel, not a big deal...run a two stroke out....well, you ran it out of fuel and starved it for oil all in one...that's all!!! Quote
ellison445 Posted February 1, 2008 Report Posted February 1, 2008 I concur!!!!! :biggrin: :biggrin: Preach Brother, I do the same with mine :cool: :cool: A perfectly tuned bike is on the edge, albeit a very thin one, of being lean. That's when it makes the most power.I don't dance on that line...I keep my bike a little like me, a little fat, a little happy.... Quote
660r2a400ex Posted February 2, 2008 Author Report Posted February 2, 2008 okay, gotch, yea im starting it from both iunderstand that, now, i normally run out of gas in the trails and stuff, what if i run the actually tank dry, i guess that'd be bad for my shee as well huhh ? Quote
660r2a400ex Posted February 2, 2008 Author Report Posted February 2, 2008 with out the pipes i would occasionally foul plugs, with them i see a clean plug with small amount of wet oil on them, but havent fouled yet and dont think i ever will Quote
yamaha04 Posted February 2, 2008 Report Posted February 2, 2008 yeah running it dry isnt all that good. the oil in the gas it the pistons and clyinders only lube. if your just putting through the trail and it starts to bogits not good but i probably wornt hurt it much. if its done alot then yeah im sure there could be problems.i would be more worried about running out going wide open down a strip or on the road. Quote
yamaha04 Posted February 2, 2008 Report Posted February 2, 2008 yeah running it dry isnt all that good. the oil in the gas it the pistons and clyinders only lube. if your just putting through the trail and it starts to bogits not good but i probably wornt hurt it much. if its done alot then yeah im sure there could be problems.i would be more worried about running out going wide open down a strip or on the road. Quote
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