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I think the 86 ports are lower than the newer. the overall length was within .0015 thats 1.5 thousandths, the later cyl works better with the thin gasket. this was checked on the same block and same rod same piston within 5 minutes.

the bridgeless beauty

I did more work in the ports after this, but didnt take any pictures

ok, I read my last post, the piston was not .003" proud it was .039" (above the deck). This was as high as i could get the deck, i had to use a Honda gasket i had in inventory since 86 that was .045 compressed compared to the cometic (wiseco) version thats only .012". This thick gaske...

http://w8raqa.bay.livefilestore.com/y1p8b7skgST5mXMvoUaKTRUDbDMo0kNdBXYsL2OzThHpz2Km5HQ9f3eoUtUQZd_JgQXMnIjiqzuE0g/Dawgs.JPG http://w8raqa.bay.livefilestore.com/y1pn1kzEXXKEcScFtTx6WBTwEcurDATgiM4x94IBA1z8i0FEic-3j1A27gX9GMyk3C5EjsXnwAql2w/Ultimate%20Trans%20Shaft%20Specs.JPG the list here should s...

you're using a 85-88 style jug with the large reed area, I looked at drilling the same style ports in mine, but witht he old jugs I cant get the port high engouh because of the lack of material, in the newer jug i could deffinately get it where i want it. I'm getting mine ready for the hillclimb sat...

anyone here runing a bridgeless jug that would like to share their ring end gap opinion? I've got mine together, not fired it yet, and I've got that knot in my guts if i've got enough. Danny, did you do any wet testing to see what affect those 2 new ports do for blowing the fuel directly out the pip...

I'm sure theres a situation that requires it, same as a top fuel car having dual plugs. i'm sure theres not to many nitro guys tho

its for high compression, when you're blowing out the spark on a single plug. Says it was a drag bike, likely was, theres a point where you load the engine so hard it simply cant jump a single spark.

if you've got an 85 you can use all of the trans gears from the 84

ya, I was expecting to slap another engine together today, cuz i blew the center gasket out of my '88 yesterday. The only jug i've got here is the bridgeless one that is still narrow enough to run the pro-x. I might just put the '88 cyl on the '86 bottom end and skip the piston break-in, gotta make ...

I've seen the window of the pin boss be the limiter on how wide the port can go

wider than the factory?

I'd like everyone to know that this is my bias opionion, and have never owned a system from accu-products, but having a family business of building performance engines for over 35 years www.millarengines.com , careful consideration of how i was going to approach the decompressor regarding durability...

I won't ever put a helicoil in a bike application, I eclusively use the pioneer insterts that are solid pieces, the 6mm case bolt inserts have a 10mm o.d. and are the best insert ever. i just had to put 6 10mm ones in some old 650 bike jug for a dude

throw it back on the hone after

I always run c-12, or u-4 mixed 1/2 with premium so fuel is lots, but 300 yards from the garage is my cousins pro practice track that most canadian pro-mx riders get to atleast a few times a year, they say its the best outdoor track in Canada. then if i want to go to the hills, they're a mile west o...

we can consider that it's actully 942, because 3 fields are of 2-stroke and only 1 field (23 votes) is 4-stroke!

redrocket190 thanks, thats quick!, what did you build that pdf in? I have better resolution pics i'd like to make a pdf of.

k, its not a manual, but I've worked outa bunch of diagrams that explain the misconceptions of the engine, and Interchangeability, http://w8raqa.bay.livefilestore.com/y1puxNFEnCmrE8kJWFWlBTqaopkBjScpRN5t3yAwCHqxk88dMFu1J5tOubBsWP2gHmRGx7ulxv7dOoJsaISRoP-fA/Ultimate%20Clutch%20Info%203.JPG http://w8r...

I've been considering the same case deal, I'm wanting to rework the LH case to accept a factory KTM hydraulic clutch button, and it'll have clearence for a 16t sproket, with a '02 cr250 style ignition cover. I have some alcoa billet pieces milled as mock-up stuff at home, I've got access to alot of ...

were they only 38.00? dammn, thats steep! I guess the cdn $ was only .70 cents at the time, instead of the par we've got now. Either way I haven't had a chance to use either tire yet

i could pay 68.00 right now, and its cheaper for me than when i got the others at 48.00 2 summers ago.

the cuz just called me, factory connection says his stuff is junk, burned beyond repair. He also needs a complete trans for the bike, and some bearing spun in hte case. He ordered another new bike, and the suspension work is on hold.

right now one of my lil cousins '07 250sxf bikes is tore down in the shop, parts in bc, and suspension in quebec, but the suspension guys shop burnt down. no word yet of the parts, because insurance workers and fire officials haven't checked the place yet. I told him it'd be best to sell it to me ch...

dannygraves wrote:

Roostius_Maximus wrote: If u guys ever rode an 02 250 compared to a 00 250, the 02 is a stump puller, and the 00 is like milking a 125 out of the hole, but the 04 is somewhere between the two

now, wasn't the '01 supposed to be the best of them all?

never rode an '01, but it could have been