Several questions concerning a 300ex

[yamahabluebruin]

Ok guys if everythingworks out i will soon own a 381ex. I have some questions. 1. What is the front/rear bolt pattern? 2. It has 21's up front and 18's on the rear, and I want to trail ride it. Could I just put 20's on the back and 21's back up front? Opinions please. 3. It has a full CHM exhaust, and I want to know if a HMF slip on will fit the CHM header? Thats all for now.

It also has 400ex a arms, does that mean 400ex shocks will fit or do I stick with 300ex shocks?

[honda300EXtreme]

1. the stock wheel offsets are
Front = 4/144
Rear = 4/110

2. 21's are fine in the rear, but i suggest going 20'' rear for trail/woods riding

3. the exhaust combo should match up, but ill look into that to be sure

4. if it has 400ex a-arms and the owner did it right it should already have a relocator bracket and 400ex length shocks
(16.25)

[yamahabluebruin]

Thanks, you hit the nail on the head dude. The shocks are dual rate works so im not real sure what they are for. But your saying I can use 400ex shocks?

[honda300EXtreme]

yea, you can use 400ex shocks if it has the relocator, but to be honest why would you want to the works are a better shock

stock 400ex shocks are terrible,

but if it has the bracket you can use shocks from many different other quads

[yamahabluebruin]

Well my plan was to do some triple rate piggy backs up front for xc riding...

[Caseys 300ex]

Well if you plan to use triple rate then just stick with 300ex shocks and have them valved for 400ex arms. Trust me dont do the relocator bracket.

[markvette]

measure your front shocks extended eye to eye. if they are 14 1/2" to 14 3/4" they are built for the 400 arms with no relocator bracket. works builds shocks for this setup so you dont have to use the bracket. i had them build a set for my sons race 300ex.

Mark

[yamahabluebruin]

Thanks for the help guys. Now I want to know who makes a stroker crank for this bike. Its already a 381 how much more can I make it? 300extreme did you find out if the HMF can would fit a chm header?

[honda300EXtreme]

no i forgot all about it, but i will find out for you,,


a 380 is damn big for a 300ex motor, i wouldnt push it much further than that

thats my opinion of course

a few places that should sell stroker cranks would be four stroke tech, and powroll, those would be your two best bets but again, i would leave it alone if you need more power then dig into the head, and find the right cam

that will make the most improvment

[yamahabluebruin]

Oh it has web race grind cams, fully ported heads, 381 piston, duncan carb, full exhaust, etc.... I just want to know how much more a man could go.

[honda300EXtreme]

i see, man that thing should be fun

but back in the day there used to be alot of built 300ex's and for some reason i want to say the maximum size is either 410 or 419 cc's, but i mean if something would happen to your motor then your screwed

and im 99% sure the HMF will work with that header,
i say go for it

[sparks427]

i was reading though and from some of the reaserch that i've done woudnt it already have a stroker crank to be a 381cc motor, i might be wrong and if i am let me know cuz if there is a way to go up to the 400s i deff. wanna know how to do that cuz i'll do that to mine and just have an extra jug and stuff layin around in case it blows.

[yamahabluebruin]

Well thats what I thought but Im pretty sure he said we could stroke the crank and still go bigger so Im not sure.