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Messages - Momus

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Suzuki / RM370 right hand engine cover wanted
« on: December 02, 2014, 01:27:05 AM »
I'm after a good clutch side engine cover for a RM370.

Will consider a complete engine.

Please email me.


Tech Talk / Re: Honda thread pitch sizes
« on: December 01, 2014, 05:09:54 PM »
Quote from: oldfart
For some reason the tap sizes are tight in alloy cases .... if you run a STD  tap they are too  loose and will strip out easy

The crankcase half and side cover threads on bikes are usually a standard M6 thread.
The threads that highly stressed fasteners, like studs, screw into are generally made with a carefully toleranced undersized tap to give a tighter fit.

There is a series of special taps to take account of this.

I use the 'Threadflow' fluteless taps that Lozza mentioned a lot at work. The tapping hole is drilled larger than for a cutting tap. The tap is wound in the normal way and displaces the aluminium (or steel or stainless steel) cold forming the thread. This gives a high strength slightly work hardened job with a good finish. There are no chips produced so this method is very safe for blind holes. These taps are quite a bit stronger than the usual type because the minor diameter is greater. The taps are more expensive but well worth the extra for fine work.

Wanted / RM370 right hand engine cover
« on: November 29, 2014, 02:45:01 PM »
I'm after a good clutch side engine cover for a RM370.

Please email me.


General Discussion / Re: Keeping up with the times
« on: November 28, 2014, 06:38:13 PM »
Old school. 

Old's cool.

Tech Talk / Re: nicely made titanium trials bike frame
« on: November 24, 2014, 09:09:09 PM »

The foot peg/brake pedal pivot drop downs formed from light gauge sheet are nice

Shame about the curves in the back bone and front down tubes being notch, bend, weld.
Operating at that level you would think organising proper bending would be a given.

Honda / Re: CR480 Carb Upgrades
« on: November 14, 2014, 06:53:32 PM »

 Spot the mistake here, granted a 500 isn't about extracting the maximum


One mistake, if you have an 84, is the suggestion to use a plug mandrell as the turning fixture.
The finnies have an angled plug.


« on: November 09, 2014, 09:13:34 PM »
No worries.

Would have liked to have come down but couldn't because of the unfortunate clash with CSC's Dunkeld meeting.

« on: November 08, 2014, 02:10:29 PM »
Stony Creek?

For Sale / Re: Ossa Phantom 250 for sale.
« on: November 01, 2014, 06:13:19 PM »
This bike has just had a total no expense spared rebuild. Asking $6500.00. Email Lewis for more details or ring 0418526061 at a sensible hour.

What year is this motorcycle?

Tech Talk / Re: KLX250 Needs rebore
« on: October 30, 2014, 12:37:12 AM »
I put a second oversize (73 mm) Z1100 piston in an otherwise healthy KL in 1984 to get 268 cc. Cosways supplied the piston, Small Bore bored the standard cylinder out with no worries.

All up I think it cost me about 100 bucks.

Gave a better than pro rata increase in power, probably because of the increased comp.

Tech Talk / Re: XR75 wont start
« on: October 27, 2014, 04:15:28 PM »
Remove (unscrew) the plug cap and cut the last 15 mm of the high tension lead off.

This last bit seems to develop high resistance.

Tech Talk / Re: How do you stop aluminium fork tubes cancer ?
« on: October 23, 2014, 10:41:43 PM »
The seat has a bad case too...

The tubes look weathered and in need of a refinish. Judging by the rusty pinch bolt it has been washed with a pretty caustic detergent.

Tech Talk / Re: rehardening gears?
« on: October 23, 2014, 06:37:21 PM »
I had the gears on my CR250M hardened at Heat Treatment in Brisbane after getting them backcut.
Not only had the gears shrunk or distorted slightly and needed to be honed to fit back on the shafts but the hardening made them very brittle and they chipped off in chunks after a couple of rides and had to be replaced.. I'd never go down that road again.

That is bad workmanship; probably too deep a case and perhaps not tempered back enough to give core toughness.

Gears can move around quite a lot when they are quenched.  Often with jobbing work the material is unknown and the heat treater takes them to too high a temperature and they move with a shrunk bore being the most obvious result

I make a few gears for car applications and always give the heat treater the material spec. and a tight fitting mandrel to keep the bores sized.

Tech Talk / Re: Hyundai iLoad for bike transport
« on: October 22, 2014, 02:47:05 PM »
Most of the vans in the link are the relatively gutless/thirsty 2.4 petrol manuals.

The TD's are  sought after.

As Dspec says they are a bit sparse for gear. I had a dealer fit cruise control as Hyundai didn't offer one.

Tech Talk / Re: Hyundai iLoad for bike transport
« on: October 22, 2014, 01:53:07 AM »
Ken, I've got one, TD 5 speed auto with  barn doors.

Will fit a CR500 with medium rise bars in. Tight going through the back but no worries inside; I can easily fit 2 full size bikes and a third in the middle rearwards. Best thing for loading bikes though are the standard dual side doors.

They will take 2 pallets end to end flat on the floor so the arches are out of the way.

Rack and pinion, coil sprung Mac struts and 4 wheel disc brakes. The 2.5 diesel and 5 speed are well matched and plenty of grunt. Where allowed these things will sit on 160 to 180 no worries and feel like you are driving a car.

I've had several vans; Nissans, Mitsubishi, Toyotas- the iLoad is head and shoulders above.

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