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Messages - John Orchard

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Vintage Track / Re: XT500, de rake? Better turning?
« on: March 14, 2019, 06:40:28 PM »
That would help with sharpening up the turning wouldnt it?

Yes the 79,80,81 TT500 triples have less off set than the early TT500 models

lt will put more rider effort into the steering process, gives the bike more trail, hence more stability at speed. Every bike l own l have reduced triple-clamp offset to get more trail.

General Discussion / Re: Track time
« on: March 13, 2019, 12:52:43 PM »
CD is great! but unfortunately it doesnt change venues like it used to. I cant justify driving from Melbourne to Queensland for it.. :'(

I have really enjoyed CD the few times I’ve attended.

This year there are 2.
1. Classic Dirt at QMP (new venue) May 3-5th
2. Classic Weekend (Ride) at beautiful Green Park Connondale (Venue for CD the last few years) June 7-9

Yep l feel the same but l guess there Qlders that don't want to drive to the Bonanza :-)

Yamaha / Re: Motocross seat conversion for Yam DT1?
« on: March 04, 2019, 09:32:05 AM »
All sorted now, Ron Whitmore helped me out with an old RM125A,B,C seat that only needed a slight reshape of the front mount bracket.

Pit-Replica in Tailand are making me a cover with the 'RM125' removed from the side and putting YAMAHA across the back.

Yamaha / Re: Yam clutch spring specs- 90501-20122 & 90501-20124 ?
« on: March 04, 2019, 09:27:12 AM »
Thanks Guy's, l was interested in the two numbers that are quoted for the DT/RT's as l would have thought one set might be a little stronger, they share much the same other clutch components.  l am hesitant to go an aftermarket set of heavy-duty springs incase they make the lever pull too stiff, coil-bind or put undue stress on the worm-drive push mechanism.

Yamaha / Yam clutch spring specs- 90501-20122 & 90501-20124 ?
« on: March 02, 2019, 12:59:18 PM »
Anyone with a range of Yamaha Clutch springs in stock be able to tell me the difference the following two clutch spring parts?


They both are listed for  a great many model Yams, both are listed for DT1 but one is listed for RT1; if one is a little stronger I'd like to get that one, TIA (Thanks In Advance).

Tech Talk / Re: Trying to find port timing diagram for a DT1MX.
« on: March 01, 2019, 09:48:44 AM »
That would be very interesting to a few l think, if you get the chance? Thanks. Do you want to sell it? :-)

Tech Talk / Trying to find port timing diagram for a DT1MX.
« on: February 27, 2019, 07:05:15 PM »
I'm still having no luck finding a port timing diagram for a Yam DT1MX, could anyone give me any leads please  :-)  TIA

Tech Talk / Re: DT1 clutch push revisited / update.
« on: February 20, 2019, 04:36:15 PM »
I went to order the GSX item (23200-31300) from Mick Hone,the Parts Guy suggested a GSXR600 item that all the GSX guys change to, cost me $53,it included the inner & outer parts,and has a steel worm-drive.

Took me an arvo to fit it, works great !  I had to grind-out the old alloy worm-drive in the casing, mounted it inside the case, just had to concoct some idea to hold the outer cap in place.

Thanks Gentlemen, got it running ...... farking PVL ignition!  Just had to put me workboots on and kick like fark!

My first experience with PVL, I'll be looking for a YZ ignition I think, anyone want a cheap PVL?  :-)

Tech Talk / Re: Help/ideas needed to get my stupid brain working.
« on: February 17, 2019, 11:27:42 AM »
I once was working on an Suz RGV250 that had a bad misfire, the sparkplugs were fouling, I'd heard that lifting the plug caps about 10mm off the plugs can cause an increase in voltage to the plug, allowing a fouled plug to fire. Having to jump the large gap allowed the system to build-up a higher voltage to make the jump? Sure thing, the RGV would run fine with the caps lifted off the sparkplugs!

Is there another way to increase the voltage to the sparkplug in this instance ?

Tech Talk / Re: Help/ideas needed to get my stupid brain working.
« on: February 17, 2019, 10:41:09 AM »
Thanks Guy's, Marcus these low winding stators that don't produce enough power at kickstart speeds, will still spark at kickstart speeds out of the cylinder?

Tech Talk / Re: Help/ideas needed to get my stupid brain working.
« on: February 16, 2019, 08:39:19 PM »
Well I'll take a punt. :-)

I haven't used that aerostart stuff but I'm assuming that if there's a spark at the right time then it's at least going to make a pop?? So there's either no spark or its sparking at the wrong time (eg 180 degrees out).

If you take the plug out, put a timing light on it and spin the engine with an electric drill you should be able to see when its firing. If that's correct it only leaves no spark under pressure.

There are those cheap ignition testers on ebay that let you set/adjust a very large gap, to simulate ignition under pressure, but I haven't tried one.

Hmm good ideas, l've set the timing as per PVL instructions but l'll try a 180 degree swap tomorrow.  Then if l don't get any pop l might look towards ignition power. Thanks.

. Yam DT1.
. PVL ignition 1.8mm advance, great spark.
. Radically ported cylinder, intake port lowered 4mm.
. GYT high comp head.
. Mikuni VM36
. Expansion chamber.

She no starting, not even a kick when spraying aerostart down the plug hole.

I'm thinking maybe the radical porting is not condusive to kickstarting speeds? With such delayed intake closing, maybe any fuel charge is being pushed back out?

Can PVL ignitions have good spark out of the cylinder but not under compression?

I would appreciate any ideas, (my brain hurts) thanks :-)

Never before have l been stumped like this.


Yamaha / Re: Motocross seat conversion for Yam DT1?
« on: February 15, 2019, 09:32:15 AM »
Wow Morley, you are a true Kiwi, love the 'mix n match". My Wife laughs at me because l have to modify everything, you will spin her out ;-)

Friends don't let friends ride stock.

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