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Messages - John Orchard

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1
Tech Talk / Re: Exhaust port height on Piston-port 250 ?
« on: January 17, 2019, 08:54:26 AM »
Hey Chaps  :-)

I purchased a ported barrel for a Yamaha DT1MX, I'm concerned that this porting could be too radical.

This is a piston-port 250 with a bore/stroke of 70x64, much the same as early KX250, TM/TS250, & CR250M.

The distance from the top of the cylinder to the top of the exhaust port is 36mm, stock on these cylinders is 39mm.

Does anyone have experience to say if this is in the ballpark?

Regards, John.

Whats the rod length?


The short rod (earlier model had a 5mm longer rod), 125mm centre to centre.

2
Competition / Re: 2019 Classic Nats
« on: January 16, 2019, 09:12:22 PM »
Is this one a deffo? I've now booked accommodation 3 times...


What's a good place for accomodation close to the track?

3
Competition / Re: Evo stuff?
« on: January 16, 2019, 06:27:35 PM »

There is a lot of "false news" bandied about stating the EVO components must come from a bike with all 3 main criteria for the class as std equipment, ie: air cooled, drum brake, no linkage. Not so, if it is an air cooled motor, drum brake or non linkage system from any bike within the period (up to & including the post classic period), you can use it. Eg: you could use the forks, wheel & TLS brake from a 1982 YZ or CR as they are original drum brake forks within the period, even though they came from a bike with liquid cooling & linkage suspension. If there is a 1994 model bike out there with drum brake front end, air cooled engine or a no linkage suspension, you can use those components as well.

K


On that basis, an engine from a CR500, YZ490, KX500 & RM500 is allowed?

4
Competition / Re: 2019 Classic Nats
« on: January 16, 2019, 11:39:45 AM »
Your ex-bike is????


Well isn't it lucky I don't have a bike for that class  ;-)

5
Wanted / WANTED - Damaged fuel tank with screw-on cap.
« on: January 16, 2019, 11:38:27 AM »
Hey Guy's, I want to replace the flip-up cap on a fuel tank with a screw-on cap (maybe one with a breather tube outlet?).

Anyone got a damaged tank I can buy and cut the filler neck out of? Need an inch or two of decent material around the neck; I don't want to weld too close to filler neck and distort it.

Thanks.

6
Competition / Re: 2019 Classic Nats
« on: January 16, 2019, 10:31:53 AM »
Who's going up from Vic?

7
Competition / ls a Pre 70 bike legal with a plastic fuel tank?
« on: January 15, 2019, 10:18:04 PM »
I really want to stay 'period' but if l have to .......

8
For Sale / DT1 68 ~ 70 swingarm bush collars.
« on: January 15, 2019, 08:44:52 PM »
Swingarm pivot bush collars x 2  To suit 1968 to 1970 only,  Part number 214-22124-00,  $50pr plus postage.

9
For Sale / Re: Yamaha dt1 250 none reed valve pre 70
« on: January 15, 2019, 03:02:09 PM »
The bike hasn't got the lowered frame but the spare frame has yeh?  If the Freakster doesn't go on the tank I'd be interested, pending price.  Also interest in DT1 crank assemblies and cylinders.

10
Suzuki / Re: RM400 creeping clutch
« on: January 15, 2019, 08:38:08 AM »
has the sleve on the input shaft the clutch basket spins on been crushed by overtightening the nut?needle bearing that runs on the sleve ok?both will give creeping along with badly galled clutch basket fingersi. remember an  dr650 that you couldn't tighten the clutch hub nut to specs coz no clearance on the sleve/trust washers so just tighten till it started to grab and back off till it was free and use the lock tab to stop the nut from undoing.found a lot of suzukis like that


Good point Matt ! l will check that :-)

11
Suzuki / Re: RM400 creeping clutch
« on: January 14, 2019, 09:14:40 PM »
sounds like grooved baskets.....not allowing the plates to fully release.


The basket on my CR looks like new?

12
Suzuki / Re: RM400 creeping clutch
« on: January 14, 2019, 01:01:45 PM »
l'm having the same issue with my CR500, l've tried thinner oil, different lever ratios, my next check is to see if l have any warped plates.

13
Wanted / Re: WANTED - Yam DT250, DT400 triple clamps.
« on: January 13, 2019, 09:53:44 AM »
Thanks for the info, now that l've had a bit of a think about it all, l'll just weld something to the steel clamps :-)

Your post made me realize that l must remember to stay within the class guidelines.

14
Wanted / Re: WANTED - Yam DT250, DT400 triple clamps.
« on: January 12, 2019, 10:06:22 PM »
If your going to run it Pre 70 you may want to stick with the originals. Several bikes have been turned away at title meetings with later alloy Yamaha items, lucky they got originals with and managed to change back and get a ride.
The brackets are quite simple to make and that is what everyone used in the day.


Yep thanks for the wake-up call.

15
Wanted / Re: WANTED - Yam DT250, DT400 triple clamps.
« on: January 12, 2019, 09:24:26 PM »
If your going to run it Pre 70 you may want to stick with the originals. Several bikes have been turned away at title meetings with later alloy Yamaha items, lucky they got originals with and managed to change back and get a ride.
The brackets are quite simple to make and that is what everyone used in the day.


Are there later model clamps, with 4 fender screw-holes, that aren't alloy? I think DT3 are steel?

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