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Topics - John Orchard

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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.


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 .......

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.

Wanted / WANTED - Yam DT250, DT400 triple clamps.
« on: January 11, 2019, 04:58:32 PM »
I need to change the triple clamps on my DT1 so that I can fit a high-mount front mudguard, I guess any later Yams that run 34mm forks will fit?

Tech Talk / Exhaust port height on Piston-port 250 ?
« on: January 11, 2019, 04:20:01 PM »
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.

Competition / ls it allowed, shock forward mounts but not used?
« on: January 01, 2019, 02:42:35 PM »
So l build-up a Pre 70 / Pre 75 bike, can l weld forward mount rear shock mounts on the swingarm but not use them in the Pre 70/75 class but switch the shocks over for a Pre 78 race?

Or is it classified as an illegal swingarm in the older classes?

Tech Talk / Ballpark start, VM36 on 250 piston-port engine?
« on: December 30, 2018, 09:00:07 PM »
Hey Guy's,

I was wondering if anyone could give a ballpark starting point for jetting on piston-port 250 running a VM36?

l have it on a Yam DT1 with ported barrel & expansion chamber. The carb that came with the bike has the follwing jetting......

MJ - 330
PJ - 30
N - 6DP1
NJ - Not out yet :-)
S - 2.5

Any help is appreciated, thanks in advance.

Yamaha / Yamaha DT1, I have found a whole new interest & respect
« on: December 30, 2018, 11:23:43 AM »
Well I acquired an old bike from the dusty back corner of my Brother-in-law's shed, turns out to be a mixture of DT1 & DT2, it has had so little use! The footpeg pins have less slop after 50 years than my bikes normally have after 6 months!

Not much wear but rusty as hell  :-)  So I have started researching parts & information for the DT's, man it is so interesting.  There must have been millions of them sold in the US; you can still buy heaps of stuff for them; new & used!

For a 1968 model Japanese machine, it was so far ahead of its time, and incredible better quality of materials than modern machines.

I'm interested in your stories relating to the early DT's ........

Tech Talk / Are there any good mods for Yam DT2 forks?
« on: December 27, 2018, 06:43:31 PM »
Does anyone know of tricks for Yam DT2 forks in making them race-ready?

Wanted / WANTED - Yam kickstart lever.
« on: December 27, 2018, 11:30:22 AM »
Hey Guy's, I'm chasing a fold-out kickstart lever to replace the stock crap lever on my DT1/2.  Apparently levers off the MX series work, also RD250LC work.  Anyone got anything?

Yamaha / Avail of DT1MX parts list.
« on: December 19, 2018, 05:31:35 PM »
I'm just needing to start doing my homework on DT1MX and other Yam models that have interchangeable parts. Can anyone give me a starting point?  Thanks in advance.


Tech Talk / Sparkplug technical information.
« on: November 23, 2018, 11:45:28 AM »
l'd like to confirm something with regard plugs...

A 'projected electrode' plug is stated as hotter than a similar heat range non projected electrode, is the plugs temp range totally related to the distance from the plug gap to where the porcelain meets the outer casing?

So, would say a '9' (NGK) projected electrode be equal to an '8' non projected?

Or would l have to measure down from the gap to the point where the porcelain meets the outer casing, and would a similar distance mean a same hest range?

Anyone know where this topic is explored?

For Sale / Private motocross track for sale - Victoria.
« on: November 09, 2018, 08:57:55 PM »
Selling my private motocross track, it is aprox 2km length on 20 acres. Track is vintage friendly with only medium size ski-jumps, not a flat paddock, has a couple of easy hills.

Aprox 2km to nearest residence, never any complaints in the last 4 years that l have used the track.

Track has main road frontage and in the Heathcote (Victoria) area.

l'm advertising the sale price as $210k

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