Cylinder Kit 223CM3 250cc for Honda ATC 200 XL200

[Russman1986]

I'm rebuilding my 200x after I destroyed it at trikefest. Trying to make it faster I have a xl200r cam and full top end gasket kit. Also a mikuni 30 mm carb and intake boot. Did a valve job and polished the head up. It has a nice kerker exhaust and was looking at this 223 jug kit couldn't find alot of info. This is a link any one ever use it?

http://m.ebay.com/itm/Cylinder-Kit-2...-/191596279700

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[DohcBikes]

Your link doesn't work but I know exactly what you're talking about and it is actually a jug for a crf230f. The seller has several parts with misleading specs.

Mickey Dunlap at fourstroketech sells a 250cc stroker kit. http://www.3wheelerworld.com/showthr...ght=250cc+200x

Your other and probably best option considering your progress already is to run a high compression wiseco piston.

The 30mm Mikuni will be too large and nearly impossible to tune out off idle bog.

[Russman1986]

I forgot to mention I had a xl200r head. I was going to go with a 10 25 1 wisco high comp just figured I would ask about this.

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[DohcBikes]

There's no benefit to using the xl200r head over a 200x head. It will work though. Good luck with the build, post updates!

[Russman1986]

I thought that I read the intake and exhaust ports are just slightly bigger. If there isn't any benefit I'm not out any money because the head came with the cam in it.

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[DohcBikes]

To my recollection none that I've owned or worked on were. Get out a caliper and prove me wrong, always ok to double check And in fact the 200x head has slightly larger cooling fins than the enduro engines.

[Russman1986]

I haven't started on it yet so I have no idea. I'm just going off of what I've read so far. But I think I will check it out with a caliper. Because you know how everything you read on the Internet is true lol.

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[Russman1986]

I fixed the link http://m.ebay.com/itm/Cylinder-Kit-2...-/191596279700

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[DohcBikes]

Ya even though it will bolt on, that cylinder is 65.5mm which means it needs around 8mm more stroke than a stock 200x crank to be a 223cc cylinder. The crf230f is a 223cc engine, 65.5mm bore, 66.2mm stroke with the same cam chain adjuster design as that cylinder a stock 200x stroke of 57.8mm it would be a very low compression engine and would not run well if at all. The guy just doesn't know what he's selling. You could do some very intense measuring and have a stroker crank built to the right spec to use that cylinder.

[Russman1986]

Thanks buddy that's what I needed to know. I'm just gonna go with what I have done and the high compression piston. What kind of high comp piston should I run considering my progress so far and also considering that I'm running pump gas

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[DohcBikes]

The 10.25:1 wiseco will work great. Bore only to the next size needed. Have your cylinder bore measured before ordering.

If you wanna spend some smart cash for a nice gain, these guys will do your valve seats for $50 with a SERDI cutter, http://www.ebay.com/itm/HONDA-CRF50-...B_QiZg&vxp=mtr providing much better flow and efficiency while maintaining port velocity. You'll need to email them beforehand and let them know what your head is. They've done a few atc heads for me at $50 so I think that'd be the price for almost any 2 valve atv head. If you have the valves cut with a SERDI, get new quality valves, and DO NOT lap them. Some use larger valves on these engines but I do not reccommend it personally.

[Russman1986]

I am interested in this thank you


you are bidding on a serdi valve jobon yourXR/CRF 4-stroke head.the serdi cutters can really open up the seat area and add some extra flow.works great with that new 88cc big bore kit you are going use.This includes disassemble head& inspect valves, insect valve guides, valve seals, valve seat sealing area, head surface lapping,serdi radius cuttingand assemble. After inspection, if anything needs to be replaced, you will be called about work needed to be done All work done in-house for reasonable turn around times by master technician. I will need to know when you send your head, whatmods you have done and or are planning on doing.precision valve seat machining on a serdi valve cutting machine is the last word in performance 4-stroke head mods.this is a lot better and more accurate then some old school 3 angle valve job done with hand tools.serdi tooling is used by most PRO AMA MOTOCROSS TEAMS,NASCAR,AND F 1 RACE TEAMS.the custom radius cutters open up the seat as well as unshroud the valve to gain better flow at all openings.why use old school thinking on your new high output race motor.Port design modifications are aided by port mapping software and flow bench testing & dyno testing and most important, on track testing for gains and wear evaluation. With todays newer 4 stroke engines making reliable extra horsepower is not an easy as just grinding on the ports, making it very critical that engine builders/tuners have the knowledge and experience to do the job properly the first time around.most valve seats are not set true to the valve guide and hand cutters will not cut the seat true to the center of the valve guide,they will follow the off set seat and not let the valve seal the way it should.plus over size valves can be installed at an extra charge.try that with your hand tools.SERDI VALVE CUTTING is the state of the art in recutting your head.



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[Quinc]

What mods did you end up doing? Did it make a big improvement in performance?