Plug Chop Pics

[tgbanshee]

Here are the left and right chop from my bike, B8ES plugs, currently at 310 mains on stock carbs with pod filters:

 

 

 

Here is the chop from a friends bike, he has a Trinity 2 into 1 carb setup with a PWK and BR9ES plugs, not sure what he is jetted at:

 

 

 

From the looks of it, it looks like my bike could use one size up on the mains although it runs fine and goes like a bat out of hell. Does the uneven color on the left plug mean anything (detonation or something)? In the second picture, my friend with the 2 into 1 and PWK, it looks like the jetting is spot on although I wonder if the colder plugs have something to do with the color and I'm curious if he should even be running those plugs. Let me know what you guys think.

Edited March 24, 2008 by tgbanshee

[dajogejr]

Run 8 range plugs. Go up 2 sizes on the mains...check the plugs again.

Are you warming the bike up on old plugs, going for a WOT run, then pulling the clutch, holding the throttle open and coming to a stop, then removing the plugs?

 

 

Are you winding out at least 5th, if not 6th gear?

 

If you are doing it properly, bump it up two sizes, chop again...keeping in mind, once it warms up, you'll probably need to jet down a size, maybe two. You're very, very close...

[tgbanshee]

Run 8 range plugs. Go up 2 sizes on the mains...check the plugs again.

Are you warming the bike up on old plugs, going for a WOT run, then pulling the clutch, holding the throttle open and coming to a stop, then removing the plugs?

 

 

Are you winding out at least 5th, if not 6th gear?

 

If you are doing it properly, bump it up two sizes, chop again...keeping in mind, once it warms up, you'll probably need to jet down a size, maybe two. You're very, very close...

Indeed, I did the plug chop exactly as you described and almost wound out 6th. I do have a 13 tooth front sprocket so I run though the gears pretty fast and can't really pin it in first or second because I'd be laying on my back with the bike on top of me :biggrin: I wonder if that would affect the results since the bike is spending less time in powerband each gear than a bike with a larger front sprocket. Both chops were done in 45 degree F weather.

[dajogejr]

Indeed, I did the plug chop exactly as you described and almost wound out 6th. I do have a 13 tooth front sprocket so I run though the gears pretty fast and can't really pin it in first or second because I'd be laying on my back with the bike on top of me :biggrin: I wonder if that would affect the results since the bike is spending less time in powerband each gear than a bike with a larger front sprocket. Both chops were done in 45 degree F weather.

 

 

Go up 2 on the main to be safe, go down 1-2 once it warms up to normal riding temps. You'll be fine. I try to get my bikes one jet to two jets on the safe side, rather than the lean side.

[jbooker82]

Hay next time you chop the plugs instead of cutting down just cut all the way around the threads. That way you can completly see around the plug.

[dragbanshee]

Hay next time you chop the plugs instead of cutting down just cut all the way around the threads. That way you can completly see around the plug.

 

Plus its actually easier!

[tgbanshee]

I used a dremel so it was easy regardless but I def agree cutting all the way around is a better idea since you get to see all the way around the insulator like you guys said. Thanks for that tip.