sparks racing 400ex carb mod's

[ridered448]

hey any one sent there carb off to curtais sparks and had them modify it? if so was it worth it? waht kinda power increse's did you feel?

[Dave400ex]

I'm wondering the same thing. I just got off the phone with Rocky Ridge about their Carb mod. They bore it to a 38mm, take off the choke assembly, and he said something else for $125. That seems like a good price, but I'm a little worried about taking the choke off because I have enough problems all ready with it starting in the cold winter. He said with it jetted right there shouldn't be any problems, but I want to hear from guys that have the mod done or their choke assembly off to find out how it starts in the cold...

[jgfarmsracer]

the choke being off is not a problem / just pump the the throttle 3 or 4 times, mine starts even better with out it. the sparks mods are great

[Dave400ex]

So even in cold weather there is no problem? I got my carb setup right now where the jetting works year round and the jets don't need to be changed in the cold and I like that. I just don't want to do this mod and have to mess with it all the time, or at all like now. If you have the Sparks mod, how much power did it add? Thanks...

[jgfarmsracer]

not for sure on the power the the throttle reponse is perfect

[ridered448]

so you dont have to jack with the jetting all the time, oh but really, is it worth the 125 dollars?

[jgfarmsracer]

Originally posted by ridered448
so you dont have to jack with the jetting all the time, oh but really, is it worth the 125 dollars?

ya i think so i have a carb that all i did was pull the choke off it doesn't have the pick up like the sparks one

[mx400]

let me tell you the sparks mod is way worth it. i have rode 400exs with and w/o the mod and let me tell u the ones with the sparks mod would take off a hell of a lot faster and not bog and would have slightly better power increases. i reccomend them 110% for any type of motor/carb work

[Dave400ex]

What does Sparks do in their modify? I would think the same as Rocky Ridge, but just wondering.

[mx400]

i have never actually asked sparks or any of the guys i race with that have their mod but that is what im gona do first thing tommarrow

[UglyMotha™]

go with the rocky ridge mod in my opinion it was well worth every penny and i got the time slips to prove it :devil: they do the same exact thing sparks does only its cheaper as as far as starting goes it's not a problem i live in ohio where winters are down right frige'ed and she starts with ease

[Dave400ex]

Ok the starting was a big concern of mine. Last question, Ugly do you have to mess with the jetting a lot, or once you got it dialed in it pretty much works for all temps year round?

[ridered448]

where can i check out this rocky ridge? im interestd, thanks!

[jgfarmsracer]

Originally posted by ridered448
where can i check out this rocky ridge? im interestd, thanks!


270-259-9604 rocky ridge racing

[UglyMotha™]

Originally posted by Dave400ex
Ok the starting was a big concern of mine. Last question, Ugly do you have to mess with the jetting a lot, or once you got it dialed in it pretty much works for all temps year round?



nope never have to mess with mine i have left mine the same since i got it dialed in that's in summer and winter also riding in ohio and west virginia

i had to go one up on the main jet cuz mine was a little lean on the top end