popping and backfiring

[05bansh]

[Dont go above 32:1, unless you like rebuilding crank assemblies.

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Hows that? My friend has been running 40:1 for years in his shee and never had a problem with his crank. I have been running 32:1 in my shee, but I am getting ready to switch to 40:1

[rocketboy]

[Dont go above 32:1, unless you like rebuilding crank assemblies.

330802[/snapback]

todays modern synthetic oils can easily and reliably be used at ratios far above 32-1

its not going to hurt your crank at all to run a higher oil/gas ratio than 32-1. some go as high as 100:1 for years with no problems whatsoever .its the quality of the oil ,high compression over 155psi now thats something that will hurt your crank!

[race-a-holic]

This has nothing to do with jetting,but in a way you were trouble shooting.One good thing to do is pressure test your motor for air leaks.Alot of people think they have a jetting problem when they have a air leak.I made my prussure tester for a few bucks and use my air compressor.i will check it once a year if I don't tear the motor apart...Also check it after rebuild.

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A friend of mine had a Banshee with Pro circuit pipes and clamp-on filters that would sound like a 22-rifle went off once he got up in the gears.It sounded awful.Surprised it didn't burn it up.He put bigger jets in it and the problem stopped.He now runs 400jets.The bike runs really good know.He's beat alot of piped Banshees.

[Sick Twin]

im haveing a similar problem i just went from stock bore with a shaved and fmf fatties ! to 20 over with vito power pistons and the stock back on it was running a 240 main jet and now it is popping like a gun going off from 0 to 1/4 throttle.

 

 

 

And the plugs are black and pretty wet.and the bike isnt broke in yet any suggestions on where to start. everything i have been reading point to being lean on the pilot .would appreciate any help

[fun_on_the_sand]

Don't complicate this, if the problem is that your shee is popping at WOT just go to the next size biger on the mains.

[fun_on_the_sand]

Also remember that if you change the gas-oil ratio you nedd to rejet since you have more gas on the mixture.

[NEVER SATISFIED]

you should also make sure you run the same TYPE of oil as when you started... NOT GOOD to mix synthetic with semi synthetic oils in your gas. use one or the other or drain before use of the other...just a quick note... im bout to go up to a 400 main and a 30 pilot with the mods that contradict the jetting such as vforce3's.. mild port... clamp on pods.. pc pipes...i ran 320's and it ran hot in 70 degree weather.....

[NitroTate]

Hey, I'm having the same problem with WOT, not firing like a gun but it loses power and starts cutting out, I'm going to try some of the suggestions from this post but I do have another question;

 

Could too much timing advance play a part or would it happen accross the throttle range if it were timing because I have great power from 1/4 to almost 3/4 throttle until I reach higher rpms and wider throttle.

[lincster]

I just rebuilt my topend with new weisco prolites. It had stock pistons before with 135 psi compression. Now it has 185 psi compression. I was running 400 mains with the stock pistons. A friend of mine told me that the motor is more efficent now and does not need as big of jets. He said to try 280 mains. I also changed my oil/fuel ratio from 32:1 to 40:1(castor 927).

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Get new friends, that logic is ridiculous. Did you mean to say a 300 main?

If you had 400 mains with an air box, you had a major air leak or are VERY rich.

Also, it is bad to change more than 1 thing at a time when trouble shooting.

 

You should be running race gas with that much compression.

[hotrodbanshee]

I have went from 280 mains up to 370 mains and it still misses out at WOT. My plugs look really good with the 370 mains. I just now noticed that there is oil/fuel leaking where the left reed cage bolts onto the cylinder. I started thinking if there is fuel leaking there, then @ WOT it is sucking air in there also and causing it to miss out. When I did my topend rebuild I reused the reed cage gaskets that were on there because they looked fine. I have a set of new gaskets that I will install this week and hopefully it will solve my problem.

[Banshee~]

Try 300 mains, 32.5 pilots, stock needle and clip position.2.5 turns out. Or you could just call toomey, they can get you close. If its to rich you can hurt your engine also.

[lincster]

Try 300 mains, 32.5 pilots, stock needle and clip position.2.5 turns out. Or you could just call toomey, they can get you close. If its to rich you can hurt your engine also.

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Call Toomey.... HAHAHAHA That is a good one.

They are the same ones that say to run 280 mains with their 2:1 air filter setup.

I run 370 mains with T5's and the 2:1. I wouldn't trust their input.

 

Get the air leak fixed first, then try it.

I would never reuse intake boot gaskets, in fact I never reuse gaskets. They are too cheap to not have new ones.

I had some sand sticking to the top of my reed cage, due to a leak, after putting in new reeds, I shut it down and spent the rest of the weekend sitting in camp.

Wasn't worth burning my motor up.