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Old 06-17-2014, 10:45 PM
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Default 1995 CR250R rebuild/HP/Torque

I have a beautiful 250 I got from my brother in law he was the 2nd owner. Both of them only put a total of 60 hours on the bike. I've had it for 2 years and I'm ready to give it an internal makeover. Please help me with suggestions. Full FMF gold series pipes, Renthol alum sprocket. I'm about ready to put on A V Force 3 reed, redo head gasket, piston rings and air filter.
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Old 06-17-2014, 11:10 PM
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Quote:
Originally Posted by CharlieMurphy5 View Post
I have a beautiful 250 I got from my brother in law he was the 2nd owner. Both of them only put a total of 60 hours on the bike. I've had it for 2 years and I'm ready to give it an internal makeover. Please help me with suggestions. Full FMF gold series pipes, Renthol alum sprocket. I'm about ready to put on A V Force 3 reed, redo head gasket, piston rings and air filter.
When you have the jug off I would suggest checking the rod for up and down play. The manual will tell you how much play is allowed, if its out of spec I would look into doing the bottom end as well. You should have a manual before opening it up, if you don't, I can send one over.
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Old 06-17-2014, 11:23 PM
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So another question, what is the stock piston size?

---------- Post added at 09:23 PM ---------- Previous post was at 09:22 PM ----------

If you could send me a manual I would be very grateful.
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Old 06-18-2014, 03:45 PM
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Quote:
Please help me with suggestions
The '95 had a pretty stout motor right out of the box, in fact the '95 cylinder
is the best of the 92-96ers.

Before I offer any advise I need to know what kind of riding you do...Trails,
MX, play riding, etc. An FMF fatty, silencer, VForce 3 and Keihin PWK will
make a good motor better for MX, but not so much for technical trails.

Quote:
what is the stock piston size?
66.4 mm

dogger
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Old 06-18-2014, 11:27 PM
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I ride trails, track, and sand. Soo 66.4 is the stock size, I did some searching last night and it said 66.34. I'm a little rusty on my mechanical side. What is a Keihin PWK? I have the fatty on there. I'm just looking for some ups that will help me keep up.
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Old 06-19-2014, 09:12 AM
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Quote:
What is a Keihin PWK?
The PWK was the next generation of carbs from Keihin. Your CR came
with a PJ. While it was a decent carb, it lacked some of the tuneability
of the PWK which came standard on most of the other brands. Switching
to a PWK will net you better throttle response and it's easy to jet and keep
jetted.

If you want a little boost, the easiest is to mill the head and rework the
squish to net a better burn and up the compression. Any competent
tuner can do this for you, but don't go overboard or you'll be stuck
running race gas. Combine the head work with a VForce 3, the Fatty
with an FMF long silencer and PWK and you should get a nice boost
in power with a fairly broad powerband.

dogger
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Old 06-19-2014, 08:47 PM
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Well this sounds very good. So piston size 66.34 or 66.40? Or is there that big of a difference? I've been looking at the PRO X any other suggestions? How much are those carbs running for?
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Old 06-20-2014, 05:54 AM
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I would always go with a OEM piston from Honda, they are pretty cheap, if your doing the top end make sure you do gasket, piston, rings, wrist pin and bearing and new C clips.

I rebuilt the top of my 250 every year, it takes about 2 hours total from stripping the plastics to putting them back on. good luck!
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