Search found 169 matches
- 07 Jan 2014, 03:07
- Forum: Motards / Specials / Rebuilds
- Topic: CRM250SMR (using CR250/YZ490/KTM250SX internals)
- Replies: 31
- Views: 62405
Re: CRM250SMR (using CR250/YZ490/KTM250SX internals)
everyone has the piston, but nobody has it in 2mm oversizemekros wrote:Vertex claims they have the piston you need, I don't know if it is a big bore or standard piston though.
- 03 Jan 2014, 03:28
- Forum: Motards / Specials / Rebuilds
- Topic: CRM250SMR (using CR250/YZ490/KTM250SX internals)
- Replies: 31
- Views: 62405
Re: CRM250SMR (using CR250/YZ490/KTM250SX internals)
Not that I know of.mekros wrote:Do mitaka make a piston you could use?
If you can find one, let me know.
I just need a KTM250 - 1999 piston in a 68.50 size that isn't a wosner.
- 27 Dec 2013, 05:11
- Forum: Technical
- Topic: rear shock
- Replies: 3
- Views: 4024
Re: rear shock
if your location is Australia like your name suggests, try Dave at Two Stroke Performance in Victoria.
He rebuilt, revalved and resprung mine for a very affordable price.
Otherwise try PROMECHA in melbourne
He rebuilt, revalved and resprung mine for a very affordable price.
Otherwise try PROMECHA in melbourne
- 27 Dec 2013, 04:23
- Forum: Motards / Specials / Rebuilds
- Topic: CRM250SMR (using CR250/YZ490/KTM250SX internals)
- Replies: 31
- Views: 62405
Re: CRM250SMR (using CR250/YZ490/KTM250SX internals)
nope... I'm in a sticky situation at the momment. Wiseco stopped making the pistons I was using, so I ordered a Wossner piston but it was faulty, so I ordered another and it was faulty too. So I've concluded that all Wossner 1996-99 265cc KTM250SX pistons are faulty so I'm stuck without a piston for...
- 28 Jan 2013, 12:56
- Forum: Motards / Specials / Rebuilds
- Topic: CRM250SMR (using CR250/YZ490/KTM250SX internals)
- Replies: 31
- Views: 62405
Re: CRM250SMR (using CR250/YZ490/KTM250SX internals)
today I made the copper head gasket, made the base gaskets, modified the piston so it doesnt scrape the oil off the bore, checked the ring gap and double checked the exh and transfer port timing. The timing is still a little high for my liking at 197/129 but that's why we have powervalves. Just have...
- 27 Jan 2013, 08:49
- Forum: Motards / Specials / Rebuilds
- Topic: CRM250SMR (using CR250/YZ490/KTM250SX internals)
- Replies: 31
- Views: 62405
Re: CRM250SMR (using CR250/YZ490/KTM250SX internals)
amongst preparing my TZR421 for some classic road racing events and commissioning a GP spec cylinder to be designed and manufactured for my road racer, I've managed to find time to get all the bits together to get the CRM beast going again. Replated cylinder with a recessed exhaust bridge new Wosner...
- 24 Dec 2012, 02:17
- Forum: Technical
- Topic: big bore crm
- Replies: 15
- Views: 12447
Re: big bore crm
if you feel that you need more power, sell the CRM and buy a KTM 300/360/380
cheap, reliable and powerful
cheap, reliable and powerful
- 22 Dec 2012, 01:02
- Forum: General Discussion
- Topic: Would this fit?
- Replies: 6
- Views: 5656
Re: Would this fit?
peak fuel efficiency is at 55 degrees any lower and the fuel droplet atomisation rate decreases, = larger fuel droplets = more fuel to do the same job as you dont get a complete burn peak power has been proven to keep on increase continually as the coolant temp is lowered, significant gains are achi...
- 21 Dec 2012, 10:25
- Forum: Technical
- Topic: Question about powervalve..
- Replies: 17
- Views: 14611
Re: Question about powervalve..
paint the powervalve with a light colored paint pen then let the piston scratch it, where its rubbing will be obvious. a few minutes with a diegrinder will fix it. if the PV position where it contacts is outside of the normal usage range then you dont really need to worry about it as your PV will ne...
- 21 Dec 2012, 03:58
- Forum: General Discussion
- Topic: Would this fit?
- Replies: 6
- Views: 5656
Re: Would this fit?
Yeah that's what I was thinking, don't suppose anyone knows the size and pitch of the temp sensor?! if thats all too hard there are other ways around it. just get a 19 or 20mm inline temp guage from trail tech. they are very affordable. you can run them through either their 39 dollar mini guage, or...
- 21 Dec 2012, 03:12
- Forum: Technical
- Topic: big bore crm
- Replies: 15
- Views: 12447
Re: big bore crm
yeah sorry, I got a little bit distracted before half way through my post as I had to go and fire up the barbie to for the end of year/Xmas BBQ at work. yes so pretty much to get a performance cylinder with an 80mm bore to work you will need to have the following modifications done 1. crank rebuilt ...
- 20 Dec 2012, 22:14
- Forum: Technical
- Topic: big bore crm
- Replies: 15
- Views: 12447
Re: big bore crm
because it will be designed for my motor (137.5mm rod, 18mm wrist pin which requires crank mods), and requires fly wheel and pickup mods to work with a programable ignition (complete bike rewire)
- 20 Dec 2012, 21:37
- Forum: Technical
- Topic: big bore crm
- Replies: 15
- Views: 12447
Re: big bore crm
Stickman (of this forum. Last contact ~ a year ago) did 300cc - He had to move the PV out in the barrel to get the clearance. He also grafted a CR 250 barrel and head onto a CRM crank before this with much more success than Jeram has had to this point. Stickman used the engine in scooter racing. I'...
- 20 Dec 2012, 21:18
- Forum: General Discussion
- Topic: local guys says CRM cylinders cant be rebored?
- Replies: 5
- Views: 4902
Re: local guys says CRM cylinders cant be rebored?
Just for the record, the AR can be rebored. you send it to a specialist such as Millenium with your new piston. for 200 dollars plus they will bore it and plate it for you. For a little extra, eric gore (whom is now part of millenium) will port it for you while its there. Also for those of you wanti...
- 18 Dec 2012, 02:48
- Forum: Motards / Specials / Rebuilds
- Topic: CRM250SMR (using CR250/YZ490/KTM250SX internals)
- Replies: 31
- Views: 62405
Re: CRM250SMR (using CR250/YZ490/KTM250SX internals)
coincidentally, Im going to have all my bits back before Christmas so that I can get the CRM going again for some January and February. However the motor wont be running for more than a few months as I am currently in talks with a cylinder casting professional who is looking into making a batch of o...