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Open Forum / My next project
« on: June 08, 2013, 04:53:00 AM »
that plastic looks like its from a newer model
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Open Forum / race here sat and sunday.
« on: June 03, 2013, 05:40:26 AM »
its pretty cool having access to a track like that when ever you want, just down the road!!
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Technical / Re Gassing rear shock
« on: April 25, 2013, 05:35:45 PM »
mx shocks should be serviced every 40 hours. more often if your a fast expert. trail you can go a bit longer. chances are you need it serviced
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Open Forum / My next project
« on: April 25, 2013, 06:39:24 AM »
i rebuild them all the time with a 12 ton press. lots to it other than pressing it apart and back together. measure the width of the crank before you begin, side play on the big end of the rod should be between .020-.030". you should cut the pin in half and press each side out individually to the inside. that way the munged up pin wont be pressed through the bore of the crank half. i made an assembly jig to press them back together true. they usually end up with only about .0005" or so runout. trueing the crank is critical. that cyl is plated, no sleeve. some plated cyls will attract a magnet, that one looks done for. time for a replate or sleeve job. honing grooves out of a cyl is never a good idea, cant do it on plated cyl anyway. even if it was sleeved by the time you honed the grooves out the piston to cyl clearance would be way too big.
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Technical / yz 250 engine seized, i think
« on: April 12, 2013, 07:32:08 AM »
fo sho! deff left that piston in there too long. check the plating around the ex port. when the piston is that loose it really wears the plating quickly. and wiseco rods are the only aftermarket rods i never use. seen several break
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General Two Stroke Talk / was there a 2 stroke in the 450 class at st. louis?
« on: March 03, 2013, 01:33:18 PM »
thats proven by the fact that on occasion the 250f class posts lap times very close to the 450s
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General Two Stroke Talk / CRF Redemption: The 500 Project Part 1
« on: March 03, 2013, 05:23:55 AM »
the gear ratios also changed after 92. 4th and 5th anyway
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General Two Stroke Talk / clock is ticking
« on: March 01, 2013, 02:24:45 AM »
no doubt! my shop is already backed up and every one wants their stuff now!
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General Two Stroke Talk / 144 bored vs 144 stroked
« on: February 24, 2013, 12:22:33 AM »
stroking the crank makes the port timing even more radical, thus the need for long rods or cyl decking or both.
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General Two Stroke Talk / 45+ racing
« on: February 21, 2013, 01:57:24 AM »
i guess i'm a youngster at 41. took a couple years off from moto after mangling myself pretty good in 2010. been trail riding mostly now. gonna do some moto in a couple weeks on our anual ride trip to north carolina, we'll see how that goes.
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General Two Stroke Talk / I think we have another convert
« on: February 19, 2013, 12:10:02 AM »
i had a 96cr250 back in the day. awesome bike, great power, great handling.
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Technical / Base gasket or not ?
« on: February 15, 2013, 10:40:14 PM »
yes you'll notice it, but make sure you check the squish clearance. if someone has been in there before they may have altered it. i wouldnt go tighter than .045"-.050" with an older crank. with a new crank i have run it as tight as .030"
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Technical / Base gasket or not ?
« on: February 15, 2013, 02:09:11 PM »
you could just have the cyl base turned down .020" on a lathe
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General Two Stroke Talk / I think we have another convert
« on: February 14, 2013, 04:33:38 PM »
i agree that 2 strokes are easy to start, but so are 4 strokes unless there is something wrong. my old kx450 and current 520exc start 1-2 kicks hot or cold. 250f is no different unless there is something wrong. the older ones can be tough especially when hot or when modified, but the new fi 4 strokes are cake
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