Please help the newbie new mods runs awful

[sandshee]

I am hopefull that someone will be able to help me out. I recently installed a 4 mil crank 5 mil rod stroker kit and a stock milled head. I already had K&N, toomey tk6s, and good running jet kit. I completed a good break in period everything seemed OK the first ride in glamis seemed pretty good I thought the motor would put out more than it did. then the sputtering begain. from then on my down hill problems begain. tried moving needle clip down to richin mix, checked carb sync, sprayed carb cleaner on all intake related parts while running to check for leaks,

 

any thoughts or suggestions would be greatly appreciated,

Tim

[T_Shee]

can you give a better description of your problem. ie not running, running bad at what throttle position, running bad when cold etc....

[sandshee]

sorry should have been more descriptive. Motor still runs, Idles, and can rev, but when I rev it hard it sputters or under load of riding it sputters.

 

Thanks

[Wildcardracing]

how do your plugs look? Are you sure you were running the proper fuel for your compression ratio?

[firebanshee]

sorry should have been more descriptive. Motor still runs, Idles, and can rev, but when I rev it hard it sputters or under load of riding it sputters.

 

Thanks

 

 

I don't want to sound like a broken record but i would check the 5 ohm resistors in the plug boots, you can get replacement ngks or get the ones without resistors but then you need to be sure to run a resistor plug or you can damage your cdi. You can check them with an ohm meter,or just get new ones on $6 each.

[firebanshee]

Are you running a spacer plate for the longer stroke? if so you need to get your head cut .080 and take out the plate and it will run WAY better.

[sandshee]

plugs looked a little wet from what I am used to. and the kit has the fat head gaskit the head had .030 chopped off.

[sandshee]

I don't want to sound like a broken record but i would check the 5 ohm resistors in the plug boots, you can get replacement ngks or get the ones without resistors but then you need to be sure to run a resistor plug or you can damage your cdi. You can check them with an ohm meter,or just get new ones on $6 each.

what am i checking for?

[Wildcardracing]

the fact that your spacer is under your head and not under the cylinder has increased your effective compression cyle even more than a spacer under cylinder setup, you may now have enough compression to need race fuel...especially considering the head was milled allready. You may want to at least perform a compression test to verify your approximate octane requirements, even if this is not the problem.

[firebanshee]

what am i checking for?

 

banshee spuddering and cutting out under load

 

you should read the above link it might help you. You are checking to see if they are open, if they are good they should read real close to 5 ohms, you unscrew the plug cap off the end of the wire and check it were the wire goes in and were the plug tip goes in. These fail alot and if you don't know they are there they are hard to diagnose, i had a friend with this problem and he thought it was a jetting issue and first he went way rich and that didn't do it so then he went way lean and smoked a piston, and found out later it was bad plug boots.

[sandshee]

the fact that your spacer is under your head and not under the cylinder has increased your effective compression cyle even more than a spacer under cylinder setup, you may now have enough compression to need race fuel...especially considering the head was milled allready. You may want to at least perform a compression test to verify your approximate octane requirements, even if this is not the problem.

will do after work tommarow, at what point would I want to start running higher octane? It crossed my mind in the desert that i might be to rich and I actually tried running my buddies gas he mixes 50/50 91 and c12.

 

Thanks

[firebanshee]

will do after work tommarow, at what point would I want to start running higher octane? It crossed my mind in the desert that i might be to rich and I actually tried running my buddies gas he mixes 50/50 91 and c12.

 

Thanks

 

155 to 160

[sandshee]

banshee spuddering and cutting out under load

 

you should read the above link it might help you. You are checking to see if they are open, if they are good they should read real close to 5 ohms, you unscrew the plug cap off the end of the wire and check it were the wire goes in and were the plug tip goes in. These fail alot and if you don't know they are there they are hard to diagnose, i had a friend with this problem and he thought it was a jetting issue and first he went way rich and that didn't do it so then he went way lean and smoked a piston, and found out later it was bad plug boots.

Im going to go check it out and see what happens.

thanks for all the input and time spent I'll let you know how it wen't.

 

Thanks again

Tim

[sandshee]

155 to 160

thats what I thought too, One of my other buddies says and we have gone back and forth on the issue for awile he always brags about only running 91 but he's always the last to the hill and last to the drags lol

 

Thanks

[sandshee]

Are you running a spacer plate for the longer stroke? if so you need to get your head cut .080 and take out the plate and it will run WAY better.

the spacer plate is the thicker head gaskit, what do you recomend? head chopped .030