4 mm Stroker?

[cloeter]

Hi guys, hope you can help me with some info I am not so clued up with engine mods, I am about to redo the entire motor, I am changing the motor to a 4mm stroker, it will have the wiseco stroker crank in and 66mm wiseco pistons in, the setup will be also a cool head, ported, FMF Fatty powercore II pipes, Pro Flow air filter with no lid, jet kit. What do you guys think of this setup, will the Hp range be between 55-65 Hp????

 

Thanx guys!

[smkmupbanshee]

Does it have any portwork? If not, I would get some.

[thegroup]

Does it have any portwork? If not, I would get some.

475017[/snapback]

that was on his list of things to do i would change ur pipes to t-5s

[dennybyz]

sounds nice ....hp sounds close ....are you using a stroker plate .....if so i was told in opinion thats not the right way to build a stroked motor ....but that was someone elses op .......if you dont use a plate its really expensive ....let me know how it turns out ....im thinking in your same direction ....

[lowriderb]

the person thats building the motor can cut the domes to run the stroke out of the cylinders, thats the better running of the two instead of running a spacer plate..

 

 

once the port work is set up you shouldnt have any problems hitting your target or beating your target hp goal.. i would deffinitly consider getting bigger carbs if your still running the stockers they will choke down the motor.. and also consider getting a better set of pipes other than the fmf's if you can..

[sheefreak]

I have seen many dyno sheets comparing Fatty's, and T-5's, and there is nothing wrong w/the Fattys. Make about the same power, and the power curve is actually a hair smoother. But I do love the way the T-5's sound.

[lowriderb]

well the fmf's and t5's arent going to let the motor perform like it would if you were to put a better pipe on there..

 

personally i would look to get some cpi's or shearer's because the gain on top end would be worth it, and the added stroke will help on bottom as much..

[Ducman]

cloeter

If you have the wiseco +4mm stoker crank, it also comes with +5mm long rods. You must use 795 series pistons or blaster pistons if you go to a 68mm bore. These pistons have the wrist pin located 5 mm closer to the top of the piston to offset the longer rod. Also you need to figure out if your going to run a stroker (spacer) plate under the cylinders or get custom cut stroker domes to handle the longer stroke since the piston will now go above the top of the cylinder w/o a spacer plate under the cylinders.

 

I think 55-60 hp is about what you may get with stock carbs and FMF fatties if it is tuned correctly. If you had 34mm carbs and inframe drag pipes you might get closer to or above 70. If you want more of an MX/trail motor I would stick with the FMF's. If you ride sand then get CPI, T-5's, ect.

[strokersquid]

on the rz web site they said to grt some 1mm gasket stock and cut your own base gaskets. but then you still have 1mm to make up on the stroke and for best compression evidentally you cant just cut 1mm out of the head and thats it. you cut the old head 1mm you put the head on w the old head gaskt and a piece of solder in the squish, kick it over a couple of times, disassemble and set the squish by milling whatever you need off. this is to keep the port timing good if you dont want to port it. anybody know an easier way ? i believe rz and banshee port timing is the same

[broke]

If you are going through the expense of this, why not just get it ported. A mild clean up port to match the timing needed for the +4 really isn't that expensive.

 

The motor in mine is a 12 port +4 RZ motor that uses no plate at all. The head was cut to accept the extra amount the piston is going to move into it. It uses a metal base gasket and stock head gasket. The motor pretty wild and docile all at the same time. You can lug gears down low, but just keep it in the same gear and it screams on top.

 

RZ and Banshee's have the same port lay out, but not the same port timing and/or shape.

 

My advice would be to get the porting done. It's cheap(ish) and it will make it run the way you want it to run.

[Polish]

I have the same set up

 

400 / 4/mill stroker long rod

blaster pistons

22cc big bore domes

34mm carbs

t-5 pipes....(now i run CPI)

 

with this set up it put out 71 HP

 

good luck

[Polish]

I have the same set up

 

400 / 4/mill stroker long rod

blaster pistons

22cc big bore domes

34mm carbs

t-5 pipes....(now i run CPI)

 

with this set up it put out 71 HP

 

good luck

[cloeter]

Thanx for all the replies, I am sorry for the confusion guys, but the motor is already been ported previously, the entire setup will be for MX and not drag/trail riding, another thing is I am currently running the stock carbs, but I will be changing to the 34mm carbs and change the pipes to T5's or T6's, still deciding on wich toomeys. The piston size will be the 66mm wiseco pistons. According to me (I could be wrong) but 66mm is a blaster size piston, is it not??????

 

Again thanx for the help guys!!!!

Edited February 20, 2006 by cloeter

[lowriderb]

from the people ive talked to get the t5's instead of the t6's the 5's seem to work better with ported motors than the 6's..

 

yes the blaster pistons are 66mm's but dont just bore your cylinders out to .080 over just to fit those pistons to the cylinders.. if you are currently on a smaller bore look into running some 795 series pistons instead..that way you wont be on your second to last bore incase something happens..