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Messages - Momus

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Tech Talk / Re: Steel or alloy clutch plates in Honda CR500 ????
« on: October 05, 2014, 05:01:28 PM »
Steel standard in the '84.

The # 22321 KA4 741 from the 91 CR250 are aluminium and direct fit .

Wiseco also sell aluminium plates.


Tech Talk / Re: RM500 DG pipe powerband
« on: October 02, 2014, 03:47:18 PM »
I scored a sound standard pipe with a squashed header from one of the RM experts here last night.

I've repaired the damage today with air pressure and heat and should be able to answer my own question about the difference between the Suzuki and DG expansion chambers.

Next question. SON mentioned a 550cc RM, presumably big bore, in one of the threads. Is there readily available  info on this?

I assume special piston, special sleeve and some concern about the strength of the cylinder.


I saw young Joel Milosevic on his TM300 hand it to a lot of 450 4 strokes at the MX Nationals round in Swan Hill in June.
Came 9th for the day.

He qualified 4th at Raymond Terrace the next round and came in 10th overall.

I predict a 2 stroke will win the 250 MX National Championship next year.

Tech Talk / Re: RM500 DG pipe powerband
« on: September 17, 2014, 09:35:27 PM »

Competition / Re: VMX race number listing
« on: September 17, 2014, 09:31:12 PM »
Marcus Smith.
Momus here.

Wanted / RM500E Full Floater wishbone RM500 Std expansion chamber
« on: September 17, 2014, 03:43:40 PM »
If any one has a RM500E wishbone- the E's have the 2 clevis' for the pushrods - I'd be happy to relieve you of it.

Ditto for a chamber in any condition.


Tech Talk / Re: RM500 DG pipe powerband
« on: September 17, 2014, 03:25:32 PM »
SON I've got the head in the mill at the moment  putting a decomp valve in it....

Interested to know if you can recommend from experience a suitable outer rotor CDI?


Tech Talk / Re: RM500 DG pipe powerband
« on: September 17, 2014, 12:24:47 AM »
Thanks SON.

Closer to 60.. 28 years ago it  had enough of everything.

I am thinking about flywheel weighting. I have a feeling that the crank wheels on the RM are already relatively high inertia

At the moment I am interested in any feedback on the change in delivery the DG chamber makes.

I've heard they are regarded as a desert racing pipe in the US.

Tech Talk / RM500 DG pipe powerband
« on: September 16, 2014, 09:41:12 PM »
I bought this RM500 fitted with a DG chamber and muffler from a bloke who flat tracked it. It came with a second exhaust which I didn't look closely at but assumed was the stock setup.

The stockie turned out to be another DG. I haven't ridden the bike yet and would like to get an idea from any 465/500 RM owners of the change this fairly fat bellied pipe will make.

I'm a bit concerned that the relatively tractor like curve I remember from one I owned 28 years ago will have been upset and given it came with a sock the jetting could be wrong for the airbox I am refitting. Any comments appreciated.



Wanted / Re: Ohlins rear shock, Simons forks for 84 CR500
« on: September 11, 2014, 02:56:05 PM »
Still looking for an Ohlins or would consider the correct White Power unit.

Also interested in a pair, or a lead on a set of Simons USD forks for same bike.


Tech Talk / CR125/MR175 as a Pre 75 250?
« on: September 03, 2014, 05:19:11 PM »
Can I legally run a '74 CR125 with a MR175 top end as a Pre 75 250?


Tech Talk / Re: 77 DT175 clutch trouble
« on: August 20, 2014, 05:50:50 PM »
Ball is slightly under the diameter of the pushrod; <5 mm if I recollect.

A pushbike shop (or dead pushy crank bearing) or a CBC/ bearing shop.

Tech Talk / Re: Rusty fuel tank fix
« on: August 18, 2014, 09:42:53 PM »
I've just cleaned up the inside of a very rusty '74 CR125 tank with the time honored molasses method.

I filled it with 2 parts water to one part molasses mix and let it sit for a few days.   
Gave it a hot water rinse and sprayed a bit of CRC inside and dried it with a heat gun.
The tank interior is now mostly bright metal with no signs of active rust.

Molasses eats the rust but has no effect on the sound steel.

You can buy molasses from a feed store; I paid 12 bucks for a 5 litre pail.

Tech Talk / Re: '84 CR500 Fork Upgrade
« on: July 16, 2014, 11:44:14 PM »
Quote from:  "Racer X"
It would be a shame if you wanted to race the pre 85 class, it would make the bike inelligable!

I'm not sure if I will run the CR500 in Pre 85. I've been out of it for a long time and plan to get back in the saddle, at least initially, on a Pre 75 CR125 and some sort of Evo thumper.

I can get the later CR cartridge conventionals via eBay for next to nothing and I thought I'd try a pair of them, and some emulators in the stock forks, for a comparison.

General Discussion / Re: A word about use of the forum
« on: July 16, 2014, 11:20:46 PM »
I have looked into doing this, and it may be possible. I will try to figure out how to limit visibility to those interested.

On another (4 wheeled) motorsport forum I contribute to we have a private area that can only be accessed by members who have the forum administrators permission.

Permission is granted, or refused, via a Private Message request from the interested member.

This outlet has allowed a lively discussion on rules and eligibility questions that parallel the Evo conversation here to continue behind a not-quite-closed closed door.

The usefulness and balance of this approach obviously depends on the administrators impartiality.


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