Can anyone confirm what I really have for a motor

[rigger]

Hey guys. Just wondering if you may be able to point me to a spot where I can look so that I can confirm what I really have for a motor, or crank, piston and so on. I would just like to know for sure while I have it torn down and going through it.

The piston is a Wiseco
562M06675
I thought this piston was for an 87' and up but I just looked on the Wiseco piston chart and they have this piston # for all four years of the R.

The crank rod has an
HA2 6 on the side of the rod. This was suppose to be an 87' long rod motor.

But the left crank case serial number is
TB06E-1007300 and from what I have found, this is an 86' case number.

The cylinder has
HF 1 on it. At least I think it is a 1.

The head has
HF 1 on it. This one I can read with no problem.

If someone knows what these are for sure or can tell me where to look, that would be great. I would just like to know for sure what I really have in this motor.

[deathman53]

thats a 30 over for a 87-89 250r. You must have a 87-89 crank in a 86 motor, I have 4 85/86 motors with long rod cranks.

[rustyATV]

I bought a new OEM late model crank, and it has HA2 6 on the rod. I, too, run '86 cases.

562M06675 is a 66.75mm Late Model (long rod) TRX piston. I almost made a mistake and called it an early piston, which starts with 526.

Unfortunately I can't search Service Honda's site any more, so I can't try to find what HF1 could be a code for. I'm suspecting an older CR250 part, but just taking a WAG.

Can you get pictures of the parts? That would help a lot.

[Rich250RRacer]

Originally posted by rustyATV
I bought a new OEM late model crank, and it has HA2 6 on the rod. I, too, run '86 cases.

562M06675 is a 66.75mm Late Model (long rod) TRX piston. I almost made a mistake and called it an early piston, which starts with 526.

Unfortunately I can't search Service Honda's site any more, so I can't try to find what HF1 could be a code for. I'm suspecting an older CR250 part, but just taking a WAG.

Can you get pictures of the parts? That would help a lot.

You'll find HF1 cast into nearly every stock 250R head and cylinder. It isn't a Honda model designation like HB9 or HA2, I believe it's just a casting number.

[rigger]

I had done a good bit of digging my self but have just not been able to find the answers I was looking for. That is why I am asking about it here.

I will get some pictures on here tonight.

I don't know if the pictures will do much good on the ports but I would like someone to try and tell me what type of port work has been done. I don't know port work very well but it has had some work done. Maybe just a port clean up, maybe some real port work.

[rigger]

You said pictures may help, so here they are.

I don't know if you can tell anything with the ports but if you can and somebody can guess what was done, it would be great info to know.
http://i708.photobucket.com/albums/ww85/rigger4343/100_0248.jpg
http://i708.photobucket.com/albums/ww85/rigger4343/100_0249.jpg
http://i708.photobucket.com/albums/ww85/rigger4343/100_0250.jpg
http://i708.photobucket.com/albums/ww85/rigger4343/100_0251.jpg
http://i708.photobucket.com/albums/ww85/rigger4343/100_0253.jpg
http://i708.photobucket.com/albums/ww85/rigger4343/100_0254.jpg
http://i708.photobucket.com/albums/ww85/rigger4343/100_0252.jpg

[rustyATV]

It's an early cylinder. Looks like a lot of nice flow work in the transfers. If you're running the late model piston in the early model cylinder, you'll want to not let that piston get too old, or you run the risk of the skirt lodging in the intake.

Does the cylinder sleeve look strange to anyone else? To me it almost looks like a sleeve in a sleeve.


Originally posted by Rich250RRacer
You'll find HF1 cast into nearly every stock 250R head and cylinder. It isn't a Honda model designation like HB9 or HA2, I believe it's just a casting number.

Oh, THAT number. I was thinking he was reading the cylinder sleeve.

[hondamancbr03]

[QUOTE]Originally posted by rustyATV
[B]
Does the cylinder sleeve look strange to anyone else? To me it almost looks like a sleeve in a sleeve.



I agree, it does look like a sleeve in a sleeve....that would be a first in my book!!!!

Rigger,
When you get the motor back together you should put a degree wheel on and check the port timing, very easy to do and many people on here can give you an idea what the porting is set up for......The transfers look a little shinning like they were raised.

[deathman53]

I was gonna say the same thing about the cylinder, 85 or 86 and the sleeve inside a sleeve. I've seen this before in cylinders that were sleeved down to 200cc and keeping the same stroke(big thing in 85-87 for the 200cc 2 stroke class) and when a 295 sleeve was installed and the person wanted to go back to a stock size.

[rigger]

So it kind of sounds like maybe I really do have an 86' motor, if that left case is original, with a long rod crank in it on an 86' or older top end.

Anybody have any pictures of an un-ported cyclinder just so I can see what has been done to the ports?

Or does anybody know were I could go to do some reading on port work? My Dad would probably know when he gets to see it. He knows old school 2-stroke pretty well from his racing days.

I have never ridden this motor. The guy I got it from had only ridden it a few times just for a short while. The top end does not even really look broke in yet. He said it pulled really well off of the bottom and through the mid and then it would get flat on top. Does this sound like what it may be ported for with the long rod. Sounds like it was maybe set up to be a woods motor. That is fine with me because that is what I will use it for anyway.

I noticed that double sleave look but I did not pay to much attention to it. Just figured that was how they did it back then.

Hate to be asking a zillion questions but this is just something that has got me wanting to learn more about it.

[hondamancbr03]

Mcdizzy.com........Port education old school style.

[rustyATV]

That would be mAcdizzy.com, and there's a small fee to join the forum, but it's peanuts for what's on there.

[hondamancbr03]

Originally posted by rustyATV
That would be mAcdizzy.com, and there's a small fee to join the forum, but it's peanuts for what's on there.

My bad....macdizzy.com it is, but there is more free information than most garage mech. would ever use about porting, cylinder maping, head CC'ing etc etc. Worth checking out if someone is considering grinding on their own cylinder.
The website was free for a long while until the ole mighty dollar became more important than sharing with fellow riders.