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Messages - Momus

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Wanted / Re: 81 RM250 Reeds
« on: December 28, 2014, 01:58:38 PM »

Do try a Suzuki dealer for new genuine parts.

 You might be suprised at how much NOS availability there is for your girl.

Tech Talk / Re: Case bearings dropping out easily!
« on: December 26, 2014, 07:37:34 PM »
The C number refers to the ball bearings internal clearance. It is not a specification for an incrementally different race outside diameter. The standard bearings for 2 stroke mains are C3. CN is the usual fit for non main applications like motor armatures, gearbox shaft support. C3 is looser than CN, C2 is tighter. C4 and C5 are looser again than CN.

These clearances specs are very fine tolerances variations and can easily be overpowered by the amount of press fit interference in the housing.

The YZ cases shown look like at least a resleeve to rectify for long reliable life. If you can get the good used set go for it.

That said, lots of engines have been put together with the garden variety (CN) bearings in worn slip fit housing and a dollop of Loctite retaining compound. If you are not concerned by the possibility of a shorter life or an unexpected teardown this might be the way to go.

Tech Talk / Re: cr80/xr80 hybrid?
« on: December 25, 2014, 01:12:09 PM »
Wouldn't  it be easier to graft better suspension onto the xr chassis?

XR frames are weak when jumped; no under engine tubes and the backbone bends.

The rear shock is very short and limits travel to about 6". CR85's run about 11" at rear.

Tech Talk / Re: cr80/xr80 hybrid?
« on: December 25, 2014, 05:21:04 AM »
Langtown in SoCal.
Once the holy grail of backyard Supercross;
150 cc 4 stroke, any chassis.

Now, after being noised out, the track is used for a novelty race for mountain bikes.

Wanted / Re: RM370 right hand engine cover
« on: December 24, 2014, 01:37:40 AM »

Suzuki / Re: RM370 right hand engine cover wanted
« on: December 24, 2014, 01:36:20 AM »

Tech Talk / Re: cr80/xr80 hybrid?
« on: December 23, 2014, 04:24:41 PM »
It's a very popular conversion with the XR100 motor being the usual choice.


I have a nearly completed XR100/Takegawa145 in an SX85 KTM chassis.

eBay Finds / Re: Mugen 125 cylinder and head.
« on: December 21, 2014, 01:41:38 AM »
Hmmm, it has some non uniform colouring on the bore and perhaps a sign that the head studs have been put in.

Tech Talk / Re: monoshock internal repair - not hard anodized 1983 YZ
« on: December 21, 2014, 01:24:24 AM »
Tomas I'd say about $300 for making and fitting/welding the shock body would be right. Of course if an engineer has to be found and directed the admin side of it could blow out a bit. Perhaps Wasp can let us know how much a new, Yammy replica 46 mm body will cost.

There could be a bit of fixturing and set up time to do the case job- ordinary car  mechanical workshops are charging well over $100 bucks an hour these days

 ;) Sounds like you have a small Honda 4 stroke big bore job underway?

Tech Talk / Re: monoshock internal repair - not hard anodized 1983 YZ
« on: December 20, 2014, 06:11:46 PM »
It shouldn't be too hard to make a new shock body. From the CMNSL website the key part looks to be an aluminium bore tube welded to a cast or forged bottom section valve body/mounting head.

With the design to copy, any jobbing engineer could machine the tube and it's features and TIG weld it to the old head.  The bore would be turned slightly undersize and a small cylinder hone and kero post welding will bring it to tolerance.
6061 grade material is the usual choice for this. It is readily available locally, fully weldable and can be hard anodised. Material cost would be negligible- perhaps $25.00 for 55mm diameter- and probably around 2 hours machining and welding.

Tech Talk / Re: Suzuki front brake cable length
« on: December 20, 2014, 03:30:42 PM »
That cable is 1190 total length with 150 of inner free length.

Have a look here for PN's and dimensions:

General Discussion / Re: Not VMX...Bubba made a boo boo
« on: December 18, 2014, 10:56:47 PM »
I'm waiting for mobs chanting that he was an innocent victim of white racism to start burning MX tracks down....

eBay Finds / Re: HRC600
« on: December 17, 2014, 05:46:05 PM »
OK, seems like the seller is referencing the chat on that bikes provenance in the earlier 8 page thread here.

 "This listing was ended by the seller because there was an error in the listing."

20K US is what, 24 large here?

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