Engine work help.

[WIkid500]

Ok guy's the 85 200x is going to get stroked, bored and a cam, along with the valve job/springs and what not. The question what should I do for a carb. Is there a size that will work best with my engine or should I bore out the stock carb. and run it? I'm going to get a good mid range cam I don't want a whole bunch of rpm's; more torque for trail riding. I need the machine to be reliable to last 100 mi trail rides and what not but it needs to be fast. A sweet compromise if you will. lol

[Dirtcrasher]

That's a question I beat up and never got much help with....

I bought the "new" 30MM Mikuni carb on EBAY and it's great, but the jets and parts are not something Sudco wants to help you out with even with carb ID numbers. Other places want me to buy 4 of one size etc etc and soon I could have 150$ into it by the time it's jetted dead nutz. BUT, these are a "stretch the AB boot" and bolt on and run carb which is a huge benefit!

So, I had a board member sell me a 28MM flatslide Mikuni with a flange machined to the front of it specifically for a built 200X motor. This one was sold by White Bros, something similar to that would be sweet for you to find.

There may be plenty of 28-30mm carbs for the 200X that will add gains, but most of them won't bolt to the stock intake and will either eliminate the airbox or force you to use radiator hoses etc etec. Thats what I DIDN'T want! and I lucked out..............

[oscarmayer]

if your spending that kind of $ on it, why not look into a CNC valve/porting job?

[WIkid500]

It's going to get ported. Got a few friends in right places. All machine work will be done by two people who know whats going on. I guess if it comes down to it I will see how the stock carb measures and bore it out if it will work that way. Everything else will be port matched
The whole stroker thing is up in the air yet, I'd like to do it, and it would be smart to throw crank bearings in it anyhow so we will see what it's like when I tear into the engine. I want it stroked bad though. Not everyone has a stroker motor.


Thanks for the info on the carbs. Anyone by chance know what stock size is off hand ?

[oscarmayer]

the cost of a stroker kit (if you can find one) would to me not weight out on the performnace. i'd get it bored out 1mm over, drop in a 12:1 comp piston and you'd be good to go. with the 12:1 you shoudl be able to stull run pump, but only super unleaded. also see if you can find some larger valves, and install larger valves (.5mm - 1mm over stocker and anymore requires new seats)

the cnc valving work I was talking about is done on a CNC machine and was flowed too. the ports are already really big, so there isn't much work neede donthe ports themselves. if they do too much to them, they can actually make it run like poo. so make sure it's not a friend who works at a shop who has some access to ttools, but a pro head specialist. the place i talked about is a pro head shop. the cool thing is they specialize in Honda motors of all types!!

[Dirtcrasher]

IDK.....

I really wan to build a stroker motor myself. Boring it and everything else gives you some nice gains, but stroking it is where the big increase in displacement comes from....

BUT, stroking costs $$ and people claim it hurts the reliability of the engine also.

[WIkid500]

For real I want a stroker crank with a compression ratio I can run any old pump gas in as this is my trail ride and I need to be able to get gas anywhere with it. As for the porting we will look at it and make a decision if we should reshape the ports or just clean them up. As for what he knows He's done a few heads in his day,pulling tractors and other stuff of the like. The guy's a genius, and a hell of a machinist. We re chambered my rifle this weekend and it ended up with .0005 of an inch run out on the chamber, that is match quality.

I know power-rol will do the crank if need be, which for 200 dollars isn't the worst if I do the rest of the work. It will be bored out for a bigger piston, so the cylinder will be fresh. I will get a web cam as I hear a lot of good things about them. Have them hard surface the rockers too. Other than that it's just little stuff you do when you rebuild an engine.



Does anyone else do a stroker crank for these? I know of power-rol and that's it.

[SWIGIN]

powroll is by far the best of all the stroker cranks i have ever seen.

they dont weld the rod pin in so it is rebuildable by any shop, and sooner or later a stroker WILL break at those welds.......as far as stroked cranks go a powroll is as close to stock for reliability as you can get.

just keep you compression around 10 to 1 and you'll be fine on pump gas like any other motor but it will run hotter so an oil cooler would be great idea.

[honda_atc200es]

not to steal the thread or anything, but what kind of power gains will be had after all this work? i wish i had the cash to do this to my bike

[WIkid500]

Thanks SWIGIN Power Roll it will be then. I like how they crush the rod rather than cutting it and welding it together too. I will Keep compression ratio around 10:1 cause we all know what kind of quality gas you find along the trail...

I don't know what kind of power this thing will make but it should be somewhat quick I would think. I think it will have just enough power to be really fun on the trails, should be able to keep up with the others. I will be working on it after I get the rest of the bike done. New plastics and rear brakes are what's left, then it will be motor work.

[SWIGIN]

just to be sure.........you are talking about powroll right?

i never heard of power roll

[WIkid500]

just to be sure.........you are talking about powroll right?

i never heard of power roll



Haha yep you got it.

http://www.powroll.com/ Them boys.

Has anyone here ever had a stroker built by them?

[SWIGIN]

not me ( soon thoe) but my buddys have....a few of them

like i said they hold up the longest out of all the rest i have seen (maybe 3-4 different types)

[WIkid500]

That sounds good. I want this to be a reliable project. I like Powroll's website they seem very helpful with all the instruction and info they have there. Not just some fly by night operation. I have yet to talk to them but when I'm at that stage we will see how it goes. I can't wait for mid winter to tear into the engine on this thing. I will post progress pic's as it comes together.