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Edited Date/Time
11/10/2014 8:48pm
Planning to send my '06 CR 250 cylinder and head to Eric Gorr for the port/mill/head work combo. Anyone have any input on this? I think it's called the Mo Better port package. Also not sure if it's worth it to do the pump gas head work or race gas, do I gain that much more power from race gas? My stock setup seems to run fine on 92 non ethanol...Any experience or input appreciated!
- all have lots of experience with that engine
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I didn't do the race gas upgrade because I didn't want any more power.
Make sure you realize the mo betta work is not designed for big gains in power, it's more about smoothing out the
power band while adding just a little. If that's what you're looking for, you'll be happy. As for reshaping the head for
race gas, that's a nice mod if you don't mind being tied to the extra cost for fuel. Some states have gas stations that
sell premium ethanol free pump gas and that's what I run in my CR500. Works great and doesn't cost a bunch. My
CR250s have highly modified heads (and port work), done by Tom Morgan, and they get uber expensive VP MRX02.
This gas also works great (unusual smell too), so I work both sides of the race gas debate.
Sounds like with the mild port work you selected, you'd be better off going with ethanol free premium pump gas. If you
want more power, you can always send the head in for reshaping and switch to race gas.
Something to consider.
dogger
I have this exact setup on my 07. Matt Bisceglia has done many laps on my bike and he loves how it runs compared to his stock 07 CR250. It has much broader power that fills the vacant low end of the stocker, boosts the mid-range, and no loss of top end over-rev.
If you are determined to use pump gas after milling the cylinder base, you can add 2.5cc to the head's dome volume. You won't get as much snap off the bottom, but it will still be a big improvement. Gorr is well versed in the base and head work, and it's $100 to do both. The actual cylinder porting is excellent from the factory and you won't get much gain from additional porting.
My bike had more lowend, but it was the midrange and topend that really ripped. Maybe he accidentaly ported for topend, but all i can say is there wasnt a 450 on the track that out accelerated it. It was super quick and very, very potent.
I loved it.. .absolutely loved it.
Your never gona get the lowend power you want out of that engine, but you certainly can make it one of the fastest bikes around with a good mid-top port job. Then the 2 teeth lower gearing will bring all that power down a bit, so you'll loose 5-7 mph on top speed. so what, I don't see anybody racing at 70 mph around the track. .
I say go for the biggest gains you can get, then if it's too gnarly, do like I had to do AMD put an 11oz fww on it..
Pit Row
But your rite, its a 2 stroke and it's strength's has to be taken advantage of.
And those advantages are light weight, excellent handling, awsome acceleration, and an aggressive overall nature.
I used to never let off the gas in corners on my kx, I just used the clutch to meter the power out untill Icould let it all the way out without fflipping.
Riding a 2 stroke like a 4 stroke will never work, get comfy riding wide open and using the clutch to meter the power and realize the true potential of that awsome CR 250.
You wouldn't be saying its quicker and improved, you'd be saying, this is the quickest bike I've ever ridden. Then you wouldn't be looking for other cr 250's to mess with, you'd be looking or 450's to smoke.. Not trying to be a smartass, just saying. I've been down that road, and my kx 250 ate 450's for lunch, as far as outrite acceleration goes..
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