fixitrod Posted February 28, 2004 Report Share Posted February 28, 2004 I have a 4mm stroker. I was using 28mm flat slides because of $$$. That's what I had. The reason I went with the stroker is because the crank went so I figured what the hell. My builder is Andy from http://www.grandriverracing.com. He suggested from the beginning that I run 35mm keihns pwk's. He also said that wouldn't loose any bottom end because of his porting. I got a set a while back and ran into some intake, boot size, air box location issues. Today I got it running on the 35mm. Man, what a difference with the bigger carbs. I didn't loose a thing. I have more power through the entire range than before. I have a low jetting sputter, but that will be resolved when I get to Dumont. If any of you have small carbs on a stroker, get the bigger carbs. It's very well worth it. I put a 15 tooth on the front and I can not keep the front end down. I may need to go bigger. I think it will be okay with the 21" paddles I'm going to run. Anyway, I just wanted to let you stroker people know that the bigger carbs are really really worth it. I was shocked. Quote Link to comment Share on other sites More sharing options...
sredish Posted February 28, 2004 Report Share Posted February 28, 2004 A buddy of mine is a +4 and he runs 36mm mikunis and he loves it. he bored in a "boost vent" in the intake port and he claims that really helped his top end but hurt his low end. Quote Link to comment Share on other sites More sharing options...
H300F Posted February 28, 2004 Report Share Posted February 28, 2004 thats exactely what i needed to hear. but... i have pwk30s sitting here waiting to be put on why didnt i get 34s!!!! Quote Link to comment Share on other sites More sharing options...
Banchetta Posted February 28, 2004 Report Share Posted February 28, 2004 I'll be dyno testing some v-force reeds, stock carbs, 28's tapered to 30, and some 33's....That won't be until we get back from Dumont though..... Quote Link to comment Share on other sites More sharing options...
H300F Posted February 29, 2004 Report Share Posted February 29, 2004 cool banchetta. i would really like to throw a set of topend pipes on mine and see what happens. i wonder if the crank makes up for their lowend lose. also id like to test 30s vs 34s. i dont think my 30s are taper bored. i really wish i went with bigger carbs, but the more i think about it the 30s arent that small of a carb and maybe they will give more well rounded power vs a set of 34s. Quote Link to comment Share on other sites More sharing options...
Banchetta Posted February 29, 2004 Report Share Posted February 29, 2004 Got me thinking, I'm dynoing w/ the midrange pipes.....maybe I'll try some high revs on the dyno also and see if carbs will be different.....that'll cost some money on the dyno though...... Quote Link to comment Share on other sites More sharing options...
H300F Posted February 29, 2004 Report Share Posted February 29, 2004 yeah its hard to say what the stroker will make of topend pipes. i still think the ptrs will be better all around. i do think there will be a considerable gain on the top, but the ptrs lowend and midrange may outweigh the lose up top. i am pleased with the way mine runs with my ptrs but i have some curriosity as to how hirevs respond. fixitrod, now you got me excited. i think i am going to attempt putting the 30s on again! i am having trouble with one overflowing. pretty sure im going to give it a shot though. Quote Link to comment Share on other sites More sharing options...
H300F Posted February 29, 2004 Report Share Posted February 29, 2004 banchetta what do you predict your putting out hp? whats your porting like? did you ride it? with the right setup i was told i would be doing 75+hp ( CPIs and 34s). i had passion racing do the porting. he added finger ports from the intake right into the transfers. i have been running on the stock carbs because i had trouble setting up the 30s. she still ran real well though, but i am real antsy to get some more bang from the 30s! Quote Link to comment Share on other sites More sharing options...
brugal Posted February 29, 2004 Report Share Posted February 29, 2004 Well those people at GRR know there stuff.I have read that 34's are the sure shot with 4mm stroker... Quote Link to comment Share on other sites More sharing options...
q8bizkit78 Posted February 29, 2004 Report Share Posted February 29, 2004 guys im running 4mm strocker with 35mm carb 15/41 and guess what you guys should try out i have a set of cpi , thunder and dmc with the 4mm strocker the dmc is a killer you guys cant bleave the result we drag race 1/8 of mile and for such distance the big pipes dont work that well and one more thing i have another set of carbs 28 flatside they suck when it comes to the 35 who knows i might get the 36 Quote Link to comment Share on other sites More sharing options...
Big Blue Posted February 29, 2004 Report Share Posted February 29, 2004 thats exactely what i needed to hear. but... i have pwk30s sitting here waiting to be put on why didnt i get 34s!!!! Did you get the 30s off of ebay, that is where i got mine and i really like them now that im getting the jetting figured out, i dont have a stroker though you should get the carbs line out and see how you like it. i didnt loose hardly any bottom end after getting the porting and im running shearer inframes and can still ride trails. Quote Link to comment Share on other sites More sharing options...
sredish Posted February 29, 2004 Report Share Posted February 29, 2004 and one more thing i have another set of carbs 28 flatside they suck when it comes to the 35 who knows i might get the 36 the 36s are sick on the 4mm with the right setup. hella good power. Quote Link to comment Share on other sites More sharing options...
H300F Posted February 29, 2004 Report Share Posted February 29, 2004 Big Blue, yea i got them off ebay. what jets are you running? im going to give them a shot today if i find alittle time. Quote Link to comment Share on other sites More sharing options...
highroller Posted February 29, 2004 Report Share Posted February 29, 2004 For you guys with the 35's, what jetting are you running? I go in the dunes in oregon and haven't yet tried my new 35's for my 4mm with t-5's. Any help would be great. Quote Link to comment Share on other sites More sharing options...
Minkia38 Posted February 29, 2004 Report Share Posted February 29, 2004 hmm.... i still have my stroker +4 motor sitting in a box with no top end..... im having Dan Hull and A&S do it, but he said i would be fine with the stock carbs bored out..... damn.. decisions decisions.... Quote Link to comment Share on other sites More sharing options...
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