Messages

1

General Two Stroke Talk / Trustworthy Piston and Con-rod Brands??

« on: April 18, 2013, 10:01:57 AM »

I'm currently running a Hot Rods Crank, Koyo Main Bearings, and a Vertex piston in my '01 Honda CR250. I've run Wiseco pistons for years without any issues. You can't go wrong with a ProX rod; however, a complete Hot Rods Crank may be just as cheap as buying the rod and having a shop replace it for you.

2

Open Forum / Two weeks in a row chaddy boy... Seriously?

« on: February 04, 2013, 11:19:24 AM »

I like how he got the bike turned around in the right direction...

3

General Two Stroke Talk / 2001 cr125 engine cases

« on: January 22, 2013, 10:57:00 PM »

You should be okay to use cases from 96 and up. In 96 Honda changed the transmission input bearing on the center case to one that was wider. You'll also need to make sure you use a 96 and newer transmission as the 95 and down have a shorter first gear/transmission input shaft. On a side note the transmissions between 5 speed and 6 speed can be swapped out without any issues. Many Kart racers swap out the 5 speed transmissions to the 6 speed without issues. Keep in mind to use a transmission from 96 and up in a 96 and up case.

4

Technical / 2001 Honda CR250 Frame Crack - downtube off steering stem

« on: January 14, 2013, 10:07:23 PM »

From what I understand the Honda frame is made from a 7000 series self hardening aluminum alloy. In the event that it is 6061 T6 the frame will have to be annealed after repairs and then re heat treated to get the T6 strength back. In light of the fact that the damage is in the steering head area it is essential that the repairs are done correctly. Having the front end snap off and your melon driven into terra firma at 50 mph usually has dire consequences.

I couldn't agree more with the past part of your statement. I know all my safety gear will do it's job but if I can avoid doing a real world test I'd like to avoid that...besides...the older we get the longer it takes to heal. I remember a debate on this site and was hoping Bearoso would chime in but he hasn't so far. We'll still do an eddy current and see what the results are. I got a replacement frame but I'd really like to see if the original one can be repaired with decent results.

5

Photos & Videos / Cleaning cases for PC 125

« on: January 13, 2013, 08:42:10 AM »

Looks sweet...if the cases are any indication this will be one sweet build.

BTW...What did you use to get them to look the way they do...or is it a "trade secret"?

6

Technical / 2005 cr250 clutch

« on: January 12, 2013, 10:15:34 PM »

When you replaced your clutch did you replace the center bearing and collar on the clutch basket? If there is too much clearance between the bearing, collar and basket it will make noise with the clutch in neutral but will go away when you pull the clutch in; this is a common problem with Honda CR250's.

 Items 5 and 23 are what I've had to replace to cure the noise problem on my '01 CR250.

7

Technical / 2001 Honda CR250 Frame Crack - downtube off steering stem

« on: January 05, 2013, 06:46:08 AM »

WTFactoryX thanks for the link. Well, armed with the link WTFactoryX provided, it's likely to be 6061-T6, we may be able to perform an eddy current inspection, http://www.ndt-ed.org/EducationResources/CommunityCollege/EddyCurrents/cc_ec_index.htm, on the frame to validate it is 6061-T6 and we're off to the races; so to speak.

Or you could just send honda an email. But they probably wont tell you cos its a two stroke.

You're probably right; they might try to sell me one of their "upgrades"...of which I'll pass...I like my ring-dings.

8

Technical / 2001 Honda CR250 Frame Crack - downtube off steering stem

« on: January 04, 2013, 07:56:07 AM »

First thing I would do is stop drill the ends of the crack then I would weld it up or even rivet on a doubler and inspect before and after each ride, but that's just me 

As mentioned before...before I weld it up I need to know what aluminum alloy this frame is made of? Knowing this would help me decide which alloy to use as my filler metal which, in theory, would help reduce the likelihood of inducing any more fatigue in this area.

As far as the repairs, I've been kicking around a few ideas on how I'm going to repair it. I've got a buddy who can NDT it to check where the crack begins and ends so that's not a problem. One idea is to groove it out and weld it up or stop drill it, groove it out, weld it up, and weld a doubler over the crack. Either way, it'll need to be looked at after each ride just to make sure the crack doesn't reform.

Then again, SachsGS makes a good point...it may be time to cut my loses on the frame and just replace it.

9

Technical / 2001 Honda CR250 Frame Crack - downtube off steering stem

« on: January 03, 2013, 09:17:40 AM »

Well...that's the gist of the whole thing...what filler rod? A4XXX, A5XXX, A6XXX or A7XXX?

10

Technical / 2001 Honda CR250 Frame Crack - downtube off steering stem

« on: January 03, 2013, 07:45:16 AM »

Well...it took some time to happen, five years, but if finally happened...my frame cracked.

Here's a little history with it.

In 2007 I was racing my '01 Honda CR250 and wrecked it...4th gear pinned. Well, as the bike went down it jammed the lower triple tree to the right, crushed the throttle cable, embedding the cable into the upper down tube.

For a number of years the damage from the cable was visible but no cracks formed from the damage. Well...fast forward to today and while looking over the bike and noticed a cracked that formed over the damage and must have happened from the last ride.

To make a long store even longer has anyone successfully repaired a Honda CR Frame? Does anyone know what series aluminum it is? I've seen lots of threads on the aluminum framed Honda's, especially the CR500AF, but no one really going into any details in what the base metal is or which filler rod was used.

Here are two pictures of the crack; the lighting isn't all that great but it should give a good idea of the crack. These down tubes appear to be of a real thin wall thickness; around 0.032 inches.

11

Technical / Calling on 2001 CR125 owners

« on: December 28, 2012, 12:52:53 PM »

Two questions: 1. Are the forks even with the top clamp? 2. Have you made any adjustments to the rear shock (rear sag, rebound, compression, etc)? 3. What is the condition of your steering stem bearings (lubed and free moving, especially the lower bearing)?

The reason I ask is if the forks are even with the top clamp and reducing sag should help tame down the head shake. Also, if the lower bearing is frozen, rusted up, it can affect the head shake as well. I would suggest making only one change at a time, forks first, to see what had the most effect.

12

Photos & Videos / Amazing on board footage Kohler Powered Wynnfurst

« on: September 27, 2012, 09:53:56 AM »

It appears to be run at Road America Elkhart Lake Wisconsin. I remember watching Mario Andretti race there with the Indy cars in the mid 80's...sure brings back good memories.

13

General Two Stroke Talk / 2013 250sx tranny issues

« on: September 14, 2012, 09:21:49 AM »

so we picked up a brand new 250sx within an hour of it being received get one ride on it. goes great break in is in full swing. second ride we go out and on third moto i come down out of a corner and try to shift to third only to find it is stuck in second. less than an hour on the bike. so now it is back at the dealership after being fixed(under warranty).
just wondering if any other 11-13 owners have had any problems like this?

It's been a few days but when you brought your bike back to the dealership did they make mention of similar problems from any of other dealers across the country? To be honest, yours is the first major problem, of any kind, I've heard concerning any of the KTM bikes.

14

Technical / Pulled off the clutch basket, crank has a silicone like glue all around it?

« on: September 09, 2012, 10:16:09 AM »

I've thrown in a couple of links to some engine cases off fleabay at the bottom. One is the left and right while the other two are just the right case. Given you mentioned 1992 - 1999 this is what came up. Two claim to ship worldwide but the other only within the United States. From the looks of the case in you pictures it looks as though the last time the engine was rebuilt they cracked the case pressing the crank in. If you could get that stuff off you might have some luck with having it welded. Looking at the parts listing on Motosport it looks as though the cases are sold as a matched set, left and right, which is probably why it's so expensive.

http://www.ebay.com/itm/1992-92-Kawasaki-KX-250-KX250-DAMAGED-Engine-Motor-Bottom-End-Crank-Cases-/230848932017?pt=Motorcycles_Parts_Accessories&hash=item35bfab28b1&vxp=mtr

http://www.ebay.com/itm/KX250-KAWASAKI-1998-KX-250-98-ENGINE-CASE-RH-/120978615476?pt=Motorcycles_Parts_Accessories&hash=item1c2ae32cb4&vxp=mtr

http://www.ebay.com/itm/kawasaki-kx250-kx-250-right-engine-case-center-main-crankcase-cases-95-1995-/370614945684?pt=Motorcycles_Parts_Accessories&hash=item564a5f4794&vxp=mtr

15

Open Forum / Where can I get these?

« on: September 07, 2012, 02:25:51 AM »

Good deal...

Now to find a couple of spare plastic pieces to practice on...if the parts aren't dark enough they may need to spend a little more time soaking.