xtankx Posted December 17, 2011 Report Posted December 17, 2011 Here's the problem... When I start the engine, it's reving pretty high during a minute or two than it goes down as the engine gets hot... After that, Idle seems okay but a little weak and then cylinder 1's spark plug dies. I know that I'm running a little rich, which may not help with idle and some guys already told me it could be a leak. Let me know your .02 about this! Thank you! Quote
Jereme6655 Posted December 17, 2011 Report Posted December 17, 2011 when does the motor rev up? RIGHT at start up..... or when you turn the choke off does it rev for a bit. is your throttle cable sticking slightly? any mods? what is your jetting set at now and what elevation are you at? Quote
xtankx Posted December 17, 2011 Author Report Posted December 17, 2011 The motor rev RIGHT at start. Choke is always off. For the throttle cable, I always give 3-4 hits on the throttle to make sure it's not sticked and then I start the motor. I got Vforce3 Reeds, Pro Circuit pipes, TORS, and slightly machined (air entrance) stock carbs. 270 mains, 27.5 pilot and needle set at 3rd position and 2 1/4 turns on air screws. Running with 40:1 mix. Things is, after rebuilt, banshee was running great. I dissassembled the carbs to switch jets for winter and when I got everything back on, the rev'ing thing started from there... For elevation, from house to playgrounds, range woul varie from 1000-1750(2000) feet above sea level. Thanks for help. Quote
xtankx Posted December 17, 2011 Author Report Posted December 17, 2011 Little update... I took of the carbs to see what could be wrong. Set the air screws to 1.5 turns. Move the needle clip from 3rd to 4th position. Turned 2 turns out the idle screws. The High rev problem seems to have stop BUT motor still dies after a couple minutes. Idle gets real weak and low and can't start it back.... Didnt take a look but I think I burned a plug, once again.... Quote
Larry's Shee Posted December 18, 2011 Report Posted December 18, 2011 Explain what you mean by burned a plug? Quote
xtankx Posted December 18, 2011 Author Report Posted December 18, 2011 Explain what you mean by burned a plug? Fouled. Wont fire anymore. Quote
Larry's Shee Posted December 18, 2011 Report Posted December 18, 2011 What plugs you running? Left or right cylinder fouling? What carbs are you using? If stock, tors still on? Have you syncronised the carb slides, so they raise at same time? Are you getting a nice blue spark on both plugs each and every timr they fire? Quote
Larry's Shee Posted December 18, 2011 Report Posted December 18, 2011 How does it run otherwise, up through gears, cruising? List ALL your jets and settings. Type of carb. Have you comepletely diss asembled and cleaned carbs? Set float levels? In spect choke plunger. Have you done a leakdown test? Quote
xtankx Posted December 18, 2011 Author Report Posted December 18, 2011 I got Vforce3 Reeds, Pro Circuit pipes, TORS elimination kit, and slightly machined (air entrance) stock mikuni 26mm carbs. 270 mains, 27.5 pilot and needle set at 4th position and 1.5 turns on air screws. Running with 40:1 mix. Range from 1250-1750ft above sea level. Running NGK BR9ES plugs and LEFT cylinder (on seat) is fouling. Carbs are sync'd. I haven't checked spark yet nor I've done a leakdown test. I haven't rode it since my main concern is getting a good idle. Quote
Larry's Shee Posted December 18, 2011 Report Posted December 18, 2011 brass washer and slosh baffle under main jet? Float level good? Check choke plunger as seat , I'll bet it's either worn/cracked or dirty. Quote
xtankx Posted December 18, 2011 Author Report Posted December 18, 2011 brass washer and slosh baffle under main jet? Float level good? Check choke plunger as seat , I'll bet it's either worn/cracked or dirty. You're the second person talking about that choke plunger seat.... I'll take a look at that tomorrow! Thanks! Quote
Larry's Shee Posted December 18, 2011 Report Posted December 18, 2011 Might be leaking just enough to make that side run little rich. As to main jet 270 sounds lean for this time of year, sure ain't warm here north of Detroit. Quote
xtankx Posted December 18, 2011 Author Report Posted December 18, 2011 Might be leaking just enough to make that side run little rich. As to main jet 270 sounds lean for this time of year, sure ain't warm here north of Detroit. Hahaha today was pretty cold out here.... I'm supposed to run around 250's on main during summer time and still was a little rich so I went 2 pts up for a 270 .... Might be fine now. I'll let you know when I get this done! Quote
Jereme6655 Posted December 18, 2011 Report Posted December 18, 2011 i wonder if your floats are hanging up a little and its burning the fuel in the bowl and then running out of fuel (causing a lean condition) which would result in a high rev situation. Quote
xtankx Posted December 18, 2011 Author Report Posted December 18, 2011 i wonder if your floats are hanging up a little and its burning the fuel in the bowl and then running out of fuel (causing a lean condition) which would result in a high rev situation. Like I said a couple of posts up, High rev trouble seems to have disappear since I dissassembled carbs, did some cleaning, put em back in place carefully.... Maybe it was just some air going through a misplaced/loose component, I dont know actually. But I fired it and I was done with the rev problem. Now the engine still dies on itself... I let it sit on idle and plug keeps fouling on left cylinder. Like Larry's Shee said, it could be the choke plunger o-ring being worn/cracked which could cause a gas leak, just enough to make it run too rich on one side... It sounds pretty plausible cause I noticed that my plunger isn't smooth a all when I try to pull it out or in.... Also, I think that my idle screws aren't long enough to catch the sliders so adjusting idle with these is useless... Quote
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