For anyone with a passion of 2 stroke bikes

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Dunno why but Yamaha have always made the best looking twostrokes, that TZ 750 being the best looking bike I have laid eyes on.Heres a few variations on a theme and you might recognise some of the frames...KX500 flattrackerKX80 frame with a KX540 bigbored engine shoehorned into it.Destry Abbots KX500 with special carbon fibre tank, 250 rad shrouds,sidepanels and seat.KX500 with singled sided swingarm (Honda VFR 400 item?)Yamaha TZ chassis with (Yep you guessed it) a KX500 engine.Yet another KX500 engine but this time it's in a Spondon chassis, Built by Sainty as far as I remember.

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I bet that Kawasaki engined sidecar in the "France" photo set sounded absolutely incredible!

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[QUOTE=demographic]I like the look of that. I've a 1991 KDX250SR F1, KDX 250 Enduro version with autolube, lights, etc. that I'm stripping down, it'll be built back up probably with Aprilia RS250 wheels.This was when I bought it the other week;Fantastic for a newbie like me to work on, mechanically the simplest bike I've come across.I'll post an update in a few weeks.

EddieJ wrote

Thanks Scott, I shall take a proper look at the photos later Being an off road man, are these KDX220A9 worth a look. I know where there is one for sale and kind of fancy mucking around on the Green lanes..

Errr, an off road man eh?You have never seen me ride offroad then Hardly, I am more of a knock about with cheap bikes pauper.Although I have never ridden any of the KDX lineup I do know they are well rated as versatile and capable, Canadian Daves Just KDX has a hell of a lot of usefull info that should keep both you and Brownie going for a bit.Eric Gorrs tech articles help with power valve alignment and so on.That 91 KDX of Brownies looks like it has the same forks as the 91-93 (ish) KX range also have, if so they are the 43mm jobbies?Brownie? Have you checked out the Save money on branded bearings thread? might help with some stuff.

demographic wrote

That 91 KDX of Brownies looks like it has the same forks as the 91-93 (ish) KX range also have, if so they are the 43mm jobbies?

Yes mate, they put the 43 mm USD forks on for a couple of years which mine has.Tried that bearing company, their online site didn't recognise the bearing number I have, however I shall call them tomorrow. Many thanks.

brownie wrote

Any one have an opinion on John Robinsons "Motorcycle Tuning : Two Stroke" book?www.amazon.co.uk/exec/obidos/ASIN/075061806X/qid=1145047165/sr=8-1/ref=sr_8_xs_ap_i1_xgl/202-4365035-5106243

If you've absolutely no knowledge on tuning, then it's a good starter book, but don't expect it to turn you into a tuning God. There are some errors in it and some topics not really covered properly, but it's a good foundation. Once you've read it, move on to Gordon Jennings book and A Graham Bell's "Two-Stroke Performance Tuning". Once you decide to go really hardcore, splash out on Gordon Blair's bible.

here is my 2 strokea kawasaki kr-1s 1989which i use for club racing[ATTACH]68141[/ATTACH][ATTACH]68142[/ATTACH]

Here's my R1-z,that's no longer for sale as i know i'll regret it

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EddieJ wrote

And sorry Scott, for some reason I thought that you were into greenlaning and enduro

No worries mate I am interested on offroad bikes, just not very good on them Bit of greenlaning but no enduro, far too much like hard work I have two KX500s (currently both rather folorn cops the main ones needing it's mainseals replaced and the local shop has been dragging their heels getting them and I still need a rear subframe for the other) so in theory theres one for supermoto and one for ..Ahem.. greenlaning. In motocross/enduro to be brutally honest if I stuck in and practiced really hard I think I might achieve the status of fairly crapI have labled those pics now so it's a tad simpler to spot that ones got a TZ chassis.HERE

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And Classic Motorcycle Mechanics has a fair bit of 2 stroke content. How abut 2 350 engines joined together in an RD400 frame to create an RD700. A taster of the article at www.classicmechanics.com/article1.htm

EddieJ wrote

The last MX bike that I owned was in about 1982 I had a 1976 Maico and a 1978 CZ.

I had a Maico but while I owned it it was never a runner cos I had too many bikes to spare the time for it, a mate now owns it and it looks like this.It's a 94/5 ish model.I gave it to a mate cos he would have the time to do it up so at least that way I get to have a bash on it.

brownie wrote

And Classic Motorcycle Mechanics has a fair bit of 2 stroke content. How abut 2 350 engines joined together in an RD400 frame to create an RD700. A taster of the article at www.classicmechanics.com/article1.htm

Unless Martin's built another engine for it, C&MM have got their facts wrong on this one. When I saw it last year it was an RD500, two RD250's joined up. Sounded so sweet when following it, specially when it came on pipe and really started wailing!

Ric wrote

Unless Martin's built another engine for it, C&MM have got their facts wrong on this one. When I saw it last year it was an RD500, two RD250's joined up.

You're correct, the article says it started off as a 500 (2 x RD250s). For the mark 2 engine two RD400E barrels were machined down to match the 54mm stroke of the 350cc and two RD250 heads were machined out to match the cylinders.I love the look, I think it's one of the best specials I've seen in a while, bet it sounds amazing.There's also a write up on the TZ750, they sound like monsters.

Anyone going to the Ace Cafe next Sunday as it's Yamaha day but a lot of Yammy lc's are meeting there and at 11am at Chelsea Bridge (north side) i'll be there on me r1-z 250 as i've come to my senses and i'm not selling it now

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senor nastyass wrote

Anyone going to the Ace Cafe next Sunday as it's Yamaha day but a lot of Yammy lc's are meeting there and at 11am at Chelsea Bridge (north side) i'll be there on me r1-z 250 as i've come to my senses and i'm not selling it now

yep. see you at the bridge

98 TZ250 Pembrey.

This was at Phillip Ils.a few weeks back in the fast group at a trackday i was doing.

kev moose wrote

98 TZ250 Pembrey.

Cracking photo mate, nice one!

EddieJ wrote

Pass the Pro-2, that pipe has given me the horn!

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Alright then if we are on the subject of TZs what about the one that Roberts rode on the flat tracks.This to me really about as good as it gets.

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EddieJ wrote

This may just get you onto the vinegar stroke

Hydroformed spannie?And yes they banned the TZ flat tracker cos it hammered the other bikes

lets keep it modern ppl

EddieJ wrote

If I remember rightly, did it get banned?

Of course it was, it was beating Hardley Ablesons on their home turf!!

asix wrote

lets keep it modern ppl

nice chicken lines

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y2blade wrote

nice chicken lines

chicken strips on the tyers then yes. took the pic in work and it was a joke that I would hide his identity. took the pic in work btw.

asix wrote

lets keep it modern ppl

Let's not The older bikes are way better looking.One of the best I've seen was an old water cooled Scott two stroke. It had modern forks, wheels etc a single shock at the back and the old guy who'd built it had done tons of one off work. Mind you, he could talk for England, , but he was an interesting guy to chat to.It looked fantastic (I saw it a couple of years ago at a Kempten bike jumble).Even the die hard British bike fans approved of what he'd done.At a quick glance, you'd never take the engine for something so old.Wish I'd had me camera with me.

Was for sale, going this weekend.

Check out this Flying Scott :smoke:

Rich_H wrote

Check out this Flying Scott :smoke:

excellent...

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Very interesting thread !Just to let you know that many of these strokers do still take to the tarmac in the ukThanks to rd/nsr/kr1sforums for making it a day to rememberimg86.imageshack.us/my.php?image=stroker36xo.jpg

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My RS, bit of a tart's handbag compared to some of the stuff in this thread:A few more pics of it's evolution, here:www.bencope.com/tate/thumbnails.php?album=14

demographic wrote

Alright then if we are on the subject of TZs what about the one that Roberts rode on the flat tracks.This to me really about as good as it gets.

wow. i really want a go of that. :smoke:

Rich_H wrote

Check out this Flying Scott :smoke:

:smoke: nice one mate.that is awesome! :smoke:

tz750 ..mmmmmm...best bike ever...just wish they had made it road legal

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EddieJ wrote

Okay here goes for a technical question Both of my TZ250's are only a year apart, yet someone has fitted a later rear caliper which runs under the rear spindle, rather than the correct for year over the rear spindle. So the question is this: Why did Yamaha see fit to change the design? I had thought that it was to make wheel change and pad change easier, but it seems to make no difference. It is also heavier being underlung as the bike is fitted with a torque rod. I have also yet to see a straight torque arm as they always seem to get bent in the event of an off..The library photos below show what I mean..

This happened on the MX bikes of the time as well, and the reason ,as i understood it , was to allow the suspension to move more freely under braking , which certainly helped the MX bikes of the time that had rear drums . I think that it stopped the braking resistance force being applied to the swingarm , and transferred it to the rear of the frame. I know it made the bike more controllable (with a drum) on braking bumps , but now all bikes have reverted to the slot & peg setup on the swing arm. Maybe it was just the fashion of the time.

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