Building a 4mm cub set up

[Bansheeduner02]

Hey im getting the cub cylinders and a 5mm crank with a 4mm longer stroke would i really need a longer swingarm i was thinking about a +1 or something cuz its going to be a desert racing bike and a duner.

 

any ideas?

[Wallrat]

Well most numbers I've seen for a 4mm cub put it around 90+HP. For that I'd recommend at least a +4 swingarm. If you wanna keep the swingarm short for better handling why get cubs? A 4mm w/ stock cyls is still gonna run like a raped ape. I've got a 4mm with a mild dune port on stock cyls and I can't keep the front end down on the stock swinger. I'm hoping that I can get away with a +2.

Edited February 11, 2006 by Wallrat

[FasterThanU90]

i just bough a bitchin +6 for mine

[1redram]

I run a +4 on my 4mill. Cub. If you want a dune bike with a little drag racing a +4 is great.

If you jump alot and ar not so much into the drag racing I would say use a +2, but you will ave problems keeping the front end down in all the gears.

 

 

Nathan

[Ducman]

+ 4 will work good in the dunes. If you go more than +2 in the dirt you spin the tires real bad and its hard to get the front end up on a surface like a dirt road. If your in softer material with good tires a +4 will work in the dirt, but I would say you will want from +2" to +4".

[lowriderb]

mainly drag racing ive been running a +10 on my stock cylinder 4mm and i will keep the same swinger for the cub motor im building, i mainly drag out in the riding areas where we ride, and need it.. the bike will stand up if i dont lean forward as well..

 

 

im also running 22x11x8 12 paddle's so im sure your probably going to run less tire..

[eehsnab2]

if you plan on doing any drag racing your going to need a least a +8. When I launch out the hole with my 8 it still stands up in a wheelie.

[Bansheeduner02]

hmm what about a stock cylinder 4mm stroker? about a 403cc bike im thinking +2 at the most.

[BigRed350x]

I'm only going to be running a +4 with 4mm cub. Thinking 22" 9 paddle for sand and 22" Razr's for dirt. I like to wheelie, so if it does like to pull the front end up that doesn't bother me. i don't drag race much at all so I don't really worry about it too much.

[Leadfoot350]

I have a +6 with a ported cylinder stock stroke. While duning the front end wants to come up and I weigh 230. With a 4mm cub your going to need a +8 swing arm or longer.

[Wallrat]

hmm what about a stock cylinder 4mm stroker?  about a 403cc bike im thinking +2 at the most.

473245[/snapback]

 

 

Well stock won't work, I can vouch for that. +2 is where I'm heading.

[lowriderb]

with the stock cylinders on a .040 over bore its a 385cc motor..

 

 

if your going to run a +2 swing arm with that motor you better be prepared to look into the sun all day long..

[bigboybanshee]

With a drag ported stock stroke 350 and a +8 swinger, I'm pulling wheelies off the line in dirt. I'd highly recommend at least a +4 swingarm unless you like riding the back wheels all the time

[trex banshee]

damn Travis i didn't know your bike was still a 350. your engine must be one of the ones Andy was telling me about. Anyways on the swingarm topic i got a +4 with my stock stroke motor and the only place i can get it to stand up is in the sand. I think my gearing has a big factor though.(17/41) but for this year its going to be bored to 68.5mm and a 4mill and a drag port with 13/42 gearing for the dirt, hopefully i won't need a longer swinger.