big bore banshee

[64xracer]

I just got my shee back together and I did alot of mods. welded crank, Dual 34pj carbs with dual K&N's, 70mm bore, stock stroke, ported to 190 on ex and 126.8 on transfers, T-5 pipes, V-force reeds, 1/2" reed spacers, billet intake, cool head with custom domes. My question is, after running it for 10 min it started smoking out of the right side pipe real bad. If I rev her up it still smokes. I let it cool down and checked compression and they were the same 150. I started it back up and it smoked for a little bit then quit. I rode it for a 10 min and it started smoking again. I started out with 175 mains and 55 pilot and it was really rich everywhere so I switched to 155 mains and 45 pilots, plugs still look rich and I opened her up and it has a hell of a flat spot in 5th gear about half way. It pulls hard everywhere else. I don't have alot of experence with the 34 pj carbs but it does'nt idle very good either. I have the choke knobs at 7.5 turns out an 1.5 on the air screw. I can't tell any difference when I screw the air bleed in or out at all. I took the carbs apart and cleaned them up but still no difference.

[1800bigk]

your pilot is too small and you main is still too big. If it pulls good except in 5 or 6 gear that means rich. Also check your plugs. Another way to see if your rich is launch in 2nd gear if it bogs out then you are rich if it takes off fine then your getting close so check your plugs. I ended at a 55 pilot and 148 main with those carbs. if its warm out where you are you may need 50 pilot

Edited February 28, 2005 by 1800bigk

[64xracer]

well I went to a 150 main and a 55 pilot and it pulls alot harder but it still won't idle. I started with the air screw 1.5 turns out and went both ways and no change. I adjusted the choke knobs from 5 turns out to 8.5 turns out...no change. When I pull the knobs out it dies. If I hold the throdle open just a little it idles fine and has pretty good response, no dead spot. It does have a little hesitation when I am riding it and idleing and go to WOT. The right side still runs richer than the left, still smoking really bad out the right side pipe, but not all the time. I sprayed carb cleaner all around the carbs and reeds but no air leaks. What next?? Go to a bigger pilot?? The main jet I think is pretty close.

[rocketboy]

the right side smoking alot isnt cool ,this is sometimes a symptom of a bad crank seal and the burning of tranny oil not saying thats your problem, but it would most likely cause alot of jetting problems among other things

[1800bigk]

what is the temperature where you are at? and what pilot jet had the best idle, the 45 or 55? I know you said neither could idle good, but were they equally bad or was one just a tad better?

Edited March 1, 2005 by 1800bigk

[64xracer]

I thought about a crank seal too but wouldn't that make it smoke out of both pipes?? I had the entire engine apart and put in new seals...I guess its possible I instaled them incorrectly it was my first time. I put them in just like the old ones came out and lubed everything up with 2-stroke oil.

 

It is about 40 degrees here . It did idle better with the 45 pilots, at least when you get it good and warm it would idle for a min or so before dieing, with the 55 it would die imedently when I took my thumb off.

[1800bigk]

wow, its 40 degrees and it idled better with the 45 than with the 55, well I dont know what to say then. Usually in my personal expierence cold weather means bigger pilot. Maybe just put the 45 back in and set the idle with the throttle cable.

The 34 mm pj are notorious for having idle probs but mine worked fine. could be luck of draw.

Edited March 1, 2005 by 1800bigk

[64xracer]

wow, its 40 degrees and it idled better with the 45 than with the 55, well I dont know what to say then.  Usually in my personal expierence cold weather means bigger pilot.  Maybe just put the 45 back in and set the idle with the throttle cable.

The 34 mm pj are notorious for having idle probs but mine worked fine. could be luck of draw.

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Well I might have mislead you, It is 40deg tonight with the 55 in and last night it was 53deg with the 45 pilot. I need to try it on the same day to get it right. But will 13 deg make that much difference?? Am I going to be battleing this when ever the temp changes??

does anybody make a jet set that has all the sizes of main and pilots in it?? If so, who and how much.

[1800bigk]

no 13 degrees will not make a difference. summer to winter makes a difference

[fastbanshee4u]

I thought about a crank seal too but wouldn't that make it smoke out of both pipes??  I had the entire engine apart and put in new seals...I guess its possible I instaled them incorrectly it was my first time.  I put them in just like the old ones came out and lubed everything up with 2-stroke oil.

 

It is about 40 degrees here .  It did idle better with the 45 pilots, at least when you get it good and warm it would idle for a min or so before dieing,  with the 55 it would die imedently when I took my thumb off.

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Each cylinder is independent .

[64xracer]

Well I took the carb, reeds and the pipe off the right side and put a pressure tester on the radaitor and shined a light in both sides and sure enough there is a small leak on the intake side. So I pulled it apart and am gonna take it to work tomorrow and fix it, tig welder time!! At least I found my smoking problem. I should be putting it together tomorrow night and then I can deal with getting it jetted. Last night I had a guy help me with it and we got it to idle and run the best with the 55 pilot and the needle all the way down (clip all the way to the top) air screw was 2 turns out. But the small amount of water it was burning probaly effected the jetting so I will have to start all over. Thanks for all the help, Brian

[1800bigk]

good, let us now how it turns out after you fix the leak

[64xracer]

ok I finally got it running and jetted!!! Shee really pulls!! I can't wait till I hit the sand, only 3 more days!! I ended up with a 152 main, 55 pilot, 1.5 turns out on air screw, 8 turns out on choke, needle clip is in the second groove from the top. It starts fist kick everytime and idles perfect. The needle position is what made it idle the best, when I tried it before I had the needle in the 4th groove. I do have a little problem though, when it is warmed up, at idle the right side does'nt fire all the time, when you hit the gas it runs fine. the carbs are the same at the top at WOT, they move the same off idle, they are clean, I switched the carbs and reeds, I checked the stator air gap, checked compression, checked for air leaks, switched the plug wires, changed the plugs and it still does it. If I pull up on only the right carb cable it starts fireing. I tried giving the right side more/less fuel and tried screwing the air screw in and out but no change. It use to do this once in a while when I had the stock carbs and cylinders on it, but now it pretty much does it all the time. Any other ideas??? Could one side of my flywheel be bad? CDI? Stator? I am probaly just going to leave it alone for this trip to LS but I am going back for snake hunt so I'll have time to order parts and get them installed if need be.

 

Thanks again for all the help!!!

Edited March 8, 2005 by 64xracer