baxterl7333 Posted February 3, 2014 Report Posted February 3, 2014 I have a fresh 421 cub build with a clean up port. Don't ride that often but when I get the chance I do a little drag racing. Was wondering would getting a full drag port done make that big of a difference in 300ft? Quote
coryv4 Posted February 3, 2014 Report Posted February 3, 2014 (edited) no the full drag port only makes a big difference in 299ft. Edited February 3, 2014 by coryv4 Quote
baxterl7333 Posted February 3, 2014 Author Report Posted February 3, 2014 If it was the same ppl who do a lot of dragging would just get a clean up port done. But they don't so it have to be some difference Sent from my iPhone using Tapatalk Quote
sheerider11 Posted February 3, 2014 Report Posted February 3, 2014 Mx port! Just kidding. Why don't you call some builders? Whoever you go with will be able to give you the best discription on what makes "there" clean up/drag port different. Quote
baxterl7333 Posted February 3, 2014 Author Report Posted February 3, 2014 Will do that. But just wanted a estimate on how much will i gain if I already have a cleanup port Sent from my iPhone using Tapatalk Quote
Surfrjag Posted February 4, 2014 Report Posted February 4, 2014 I would worry more about getting your setup right before getting the last 5-10hp 1 Quote
stroking Posted February 21, 2014 Report Posted February 21, 2014 (edited) dont waste your money if its a cub,builders will just feed you alot of bs,and in the end you will end up with a clean up port job anyway lighter frame,pipes,domes,timing,and gearing will gave way more than leeting someone grind on your cylinder....theres storys i could tell you about BIG TIME engine builders whos ported cylinder and gave me domes to go with them and bikes was no faster than what i could do myself. Edited February 21, 2014 by stroking Quote
sleeper06 Posted February 21, 2014 Report Posted February 21, 2014 Not true when I drag port cubs theres a decent pile of aluminum taken out and timings adjusted just fyi, to me every little bit helps hp is hp in any shape or form and u better beleive the guy lined up next to is full tilt Quote
sprinklerman Posted February 21, 2014 Report Posted February 21, 2014 Not true when I drag port cubs theres a decent pile of aluminum taken out and timings adjusted just fyi, to me every little bit helps hp is hp in any shape or form and u better beleive the guy lined up next to is full tiltAgreed. ^^^A reputable builder will do what he says he'll do. Stroking ' s problem is probably setup. Just because you have more power doesn't mean you'll go faster. That's assuming you actually increased power. Sent from a van down by the river Quote
RadarRacing Posted February 22, 2014 Report Posted February 22, 2014 I honestly dont see why there should ever be a clean up port. Drag ported will see a bit of gain but so will many other things that you dont have to unbolt and send your cyl off to do. If you dont have big carbs , shearers or cpis , drag axle then do all that first. A drag axle is a big gain. If you have everything go for a drag port. Quote
camatv Posted February 25, 2014 Report Posted February 25, 2014 the castings have gottn a lot better in the last few eyars. long time ago when i started working with cheeta's the transfers were nearly plugged off from casting flash at times. then they had to have a clean up done or they did run like crap. the porting i do on cubs is mostly to broaden the power out i feel. and some internal realignment of ports.. i have seen a bunch of overported cubs. or cylinders that were best suited for super light setups. a lot of them would get so pipey they wouldnt handle much load, a missed shift, or shock on take off. i personally dont like a bike that rides that way. Quote
possum Posted February 26, 2014 Report Posted February 26, 2014 I dont even know why a cleanup port is even called a port. its not porting its cleaning up casting flash. easy way to fool the clueless and get paid i guess. When it should be called a cleanup not a port. And not cost as much as a port job. Quote
camatv Posted February 28, 2014 Report Posted February 28, 2014 maybe because most (at least i do it for sure) clean up the port area's also. i just call it a casting cleanup myself. but do as the romans ya know. Quote
stroking Posted March 6, 2014 Report Posted March 6, 2014 another miss leading info is that alot of compression slows you down....{WRONG)....I SEEN enignes with 225psi run 116-120mph...(on alky).7/10milcubs... you just have to know what to set other things at.... when i port a cub i change the port timimg on the exhaust,but some (builders) just clean up the portand leave the timimg the same they tell you they drag ported it and charge you $450-500 had one tell me he never uses a degree wheel because they dont give accurate readings Quote
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