Post by: SSGHopkins on May 04, 2012, 08:22:37 PM
The bike. The guy I sold the RMZ to had a 2003 YZ250 sitting in his garage and after some talking I got it for 300 bucks. The only thing really wrong with it was a grenaded top end. Here are some pics.
The Bike
The Cylinder
The Piston
Box o' parts
I have decided to do more than just get the bike ridable, I am going to make it AWESOME.
So far I have gotten the frame powder coated black
I have also rebuilt the bottom end with a weisco crank and bottom end kit.
So now I am trying to decide what to do with the top end, keep it stock or bore it over. Also where is the best (read cheapest) place to get a full bearing kit? I am also looking for some Kite, Talon or DNA hubs, anyone know where to get those the cheapest. My Pegs and grips will come from TORC1 racing (I get a pretty good discount. Any help or advice would be appreciated. Also as I understand it a 250 2 stroke races 250 4 strokes in amateur racing, correct? Also if I go big bore how big until I cant run with the 450's? Thanks everyone. It will be a few months before I can finish since I wont be able to finish until I get back from Italy.
Post by: ford832 on May 05, 2012, 01:00:41 AM
Can't wait to see how it turns out as I'm still mulling over colour combo's for mine.
Post by: cnrcpla on May 05, 2012, 04:07:10 AM
Can't wait until your done, I love YZ projects 
Post by: SSGHopkins on May 05, 2012, 09:37:22 AM
Post by: TMKIWI on May 05, 2012, 09:49:48 AM
Some of the part numbers are the same for YZF & YZ.
In 06' Yamaha did the yellow aniversary model. I like the look.
You should be able to make the 06' plastics fit.
Post by: SSGHopkins on May 05, 2012, 12:26:03 PM
Post by: arnego2 on May 05, 2012, 09:28:51 PM
Post by: streaks383 on May 07, 2012, 02:28:56 AM
Post by: MyckMcClung on May 07, 2012, 06:49:33 PM
Post by: SSGHopkins on May 10, 2012, 09:53:17 AM
Post by: cnrcpla on May 10, 2012, 12:28:23 PM
Post by: SSGHopkins on May 10, 2012, 06:14:21 PM
I used Millennium Technologies for my cylinder on my YZ. They did a great job on my cylinder.
Contact info?
Post by: cnrcpla on May 10, 2012, 10:00:59 PM
Fax: 920-893-4830
Address: 1404 Pilgrim Road ? Plymouth WI 53073
Site: http://www.mt-llc.com/
Post by: SSGHopkins on May 11, 2012, 09:30:27 PM
Post by: SSGHopkins on May 13, 2012, 04:28:21 PM
Post by: ruskee on May 14, 2012, 04:17:10 AM
Post by: scotty dog on May 17, 2012, 03:25:42 AM
Post by: Stusmoke on June 03, 2012, 08:30:53 AM
Ok what about the 295 kit for this bike? Anyone rode one? I will be racing MX and Hare Scrambles down in Georgia
I've heard of a couple of people running the 295 kit and their fifth gear going off consistently. Not sure if its the same model or same kit or anything but I'm pretty sure I heard it somewhere on here not sure who from.
When Dogger did his (godlike) CR project he sent basically his entire engine off to be cryogeniclly insert-technical-phrase-here anyway the outcome was major loss in friction, less wear and twice as strong.
I can understand the fifth gear going its putting a tremendous load on it. Anyway as I said this is just something I've heard and is possibly inaccurate. Just something to consider if you're gonna go the 295 kit.
Good luck mate going really nicely so far
Post by: SachsGS on June 03, 2012, 02:44:36 PM
Post by: Stusmoke on June 04, 2012, 12:07:33 AM
Post by: cnrcpla on June 04, 2012, 12:44:41 AM
Post by: Stusmoke on June 04, 2012, 02:19:18 AM
Just a thought here, I know transmissions can take a beating, and I know gears are pretty tough, but keep in mind the gear boxes are meant to handle 250 cc's of power, maybe a little more, but I don't think that a 250 trans is designed to handle the torque and power of an additional 110 cc's. I'm no engineer (yet, I'm going to school for it) but you wont catch me running a 360 kit on a stock 250 trans. Just my 2 cents though.
Yeah that was my point too. You could swap it out for a long ratio tranny maybe but that wouldn't do much for mx. If you do find a 360 kit, I'd look for ways to get your gears treated and strengthened. As I said Dogger had some pretty sweet **** happening inside his powerplant so you might want to contact him
Post by: cnrcpla on June 04, 2012, 02:34:43 AM
Post by: Stusmoke on June 04, 2012, 02:36:56 AM
Post by: cnrcpla on June 04, 2012, 02:38:20 AM
Post by: SachsGS on June 04, 2012, 03:37:44 PM
Post by: Stusmoke on June 05, 2012, 07:28:09 AM
The engineers at Yamaha would have designed a safety factor into the transmission so it would probably handle the additional torque of the 360 kit.Ohlins would have had this in mind.
Maybe but I wouldn't stake too much on it. google Ohlins 360cc kit problems or issues or something like that, see how frequent they are. Sachs may be right, he usually is. 360 cc's is alot of load on the gears though
Post by: SSGHopkins on August 04, 2012, 07:35:44 PM
Post by: streaks383 on August 06, 2012, 06:23:11 AM