Gorr KX310?

ETS

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#1
If anyone knows I'm looking for opinions of this motor. Looking for tractability like a EXC or MXC 300. I searched but didn't come up with much. How about reliability, starting, finicky jetting, and other problems that might occur. Will it need flywheel weight. What I'm looking for is a non serious MX playbike that I can take to the track and lug around or rip around depending on mood. Nothing that will wear me out or have a pipey band that isn't forgiving. Looking for a similiar powerband to the stock yz400 that I once had only without the extra lbs. Thanks
 

ETS

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#4
Somebody has to have one of these. I would like to the good and the bad about the 310. Thanks
 

Senior KX Rider

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#5
There is no bad that I can think of. Reasonably priced conversion, starts on one or two kicks every time, more power off the bottom, more power in the mid, more power on top, as reliable as any MX bike I have owned, no more (or very little more)vibration IMO than stock. The only bad thing is it wears out rear tires faster than before. ;)
 

Rich Rohrich

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#6
If there is a down side to the 310 it's the sometimes limited availability of the single source replacement pistons in that size. The upside is no one ever seems to wear them out, so maybe it's a moot point. ;)

The EG-265 big bore has most of the same characteristics as the 310 with a bit snappier response (more two-stroke like) and the pistons are available as a stock item through any Wiseco dealer.
 
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#8
Good report- does the 310 have as much more raw mid/hi horsepower than 265 as the jump in cc's would indicate? Or is it more of a torque, low/mid increase thing? Thanks.
 

NO HAND

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#11
The piston availlability may have some weight though. Irony is such that you might have a hard time to get that piston just when you need one in a hurry. That would make me choose the E-G 265 kit hands down.
 

Senior KX Rider

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#12
IMO thats not a reason to miss out on a really great off road motor package. When I had Eric do my cylinder I bought an extra piston and rings for it and guess what..... The piston is still in the box on the shelf. I will probably put it in the next time I tear the motor down and then I'll order another :clue:
I have always kept extra piston, rings and gaskets on hand for all my MX bikes. Also brake pads, levers, chains, sprockets, wheel bearings......
 
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bclapham

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#14
Hey Rich; why cant you guys just spec another piston??? surely a piston is a piston is a piston right???? or even just mod the spec slightly to get around their config????