A forum for owners of Yamaha TTR250 trail and enduro bikes!

Awesome exhaust!! Is the frame cradle below the engine different?

No starter motor, kicker only..

 

It's an interesting beast alright it's a closed group on fb 

Heaps of comments going on it when I find out more I will let everyone know .

 

 

 

-- Edited by ttboof on Friday 20th of January 2017 10:06:27 PM

-- Edited by ttboof on Friday 20th of January 2017 10:07:17 PM

Don't think it's a YZ frame- see phtos of YZ frame below plus what a TTR-powered MXer might look like!

The only thing that came from a TTR on the FB one is the engine and gearbox I think.

I just saw this on their facebook page too. Very cool. I always thought about the TTR engine into the steel framed WR.

Here is some more info:

""The bike is pretty much hand built. IIRC is was a collaboration between Cisco's and YZR Engineering (aka Bert Flood Imports).
They were aiming for WRF250 style concept bike, a few years before Yamaha released the WRF250. By all accounts, they succeded - although attitudes have probably changed since the first YZF/WRF250 went way harder than anyone expected.

The story was hand built frame, TTR250 motor, linkless WP shock, YZ bodywork.""

 

""carb and cam and bullet proof..yamaha went the whole season on one crank in the thumper nats racing when they went to yz 4 strokes the cranks were changed out before 15 hours for safety reasons..""


Apparently a CCM tank, and the rear side panels and guard look like YZ parts.


I have that linkless WP shock in the shed, but apart from less maintenance and better ground clearance I dont think it would be worth the effort over the existing TTR shock setup??

-- Edited by Kaos on Saturday 21st of January 2017 09:11:42 AM

Great find Les - thanks for sharing!

I thought the Aus TTR specials were mythical beasts but here one is in the flesh and looking brilliant!!!!

Would this have been the special that Geoff Ballard won the class with at the Nats?

I have joined the FB Group (they obviously aren't picky about who they let in ) and will have a good read later.

Brian

Not sure how they can race it in Vinduro - maybe they don't?

These are the "rules" on eligibilty I found:

 

VERi events are meant for Pre 85 model bikes

All motorcycles that were released as 84 Australian delivery models are eligible.

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The following models were manufactured post 84 however they are identical to their earlier brothers with the exception of BNG (Bold New Graphics) so are welcome at VERi events. (flow on models)

Yamaha 

1985 IT 200

1985 IT 250

1985 IT 490

1985 TT 600 (excluding Belgarda)

DT 175 - all drum brake models

 

Kawasaki 

 

1985 KDX 200

1985 KDX 250

Honda 

 

XR 200 - all years 

1985 XR 250

1985 XR 350

Suzuki

TS 185 - all models

 

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The following models were not made prior to 1985 and are physically different to 1984 models but are considered 'old school' so are welcome to VERi events.

1985 - 1987 Yamaha IT 200

 

 

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The following models are not considered to be classic Trail or Enduro models and as such are NOT WELCOME at VERi events so please don't ask.

Use of major parts from post 85 models (forks, discs etc.) are frowned upon as they are not in the 'spirit' of the event. 

 

All post 90 models

Any model that came standard with a rear disc as this represents a technological timeline. (Rokon's exempt)

 

Watercooled KDX 200's & 250's

Yamaha WR range, 200's - 250's & 500's

Hey Les and Brian.

Did you see the latest info on the facebook page. They are hidden in the comments, some of magazine articles at the time with more pics and info.. Great stuff.

I wonder how much lighter they actually are? Lose the battery, startermotor and solenoid, rear light and flashers from a ttr... The rear subframe is obviously thinner, and I'd guess the front box section downtube on our bikes is heavier than the thin twin tube cradle on this bike. Probably lightweight wheel rims. I don't think there's much difference between usd and conventional forks weightwise?
I have a vague recollection of weighing my frame stripped at 12kg. Brian did you ever weigh the yz?
They sure look nice bikes. Lean and hungry, but not like an ironing board like modern enduros.

mossproof wrote:

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I wonder how much lighter they actually are? Lose the battery, startermotor and solenoid, rear light and flashers from a ttr... The rear subframe is obviously thinner, and I'd guess the front box section downtube on our bikes is heavier than the thin twin tube cradle on this bike. Probably lightweight wheel rims. I don't think there's much difference between usd and conventional forks weightwise?
I have a vague recollection of weighing my frame stripped at 12kg. Brian did you ever weigh the yz?
They sure look nice bikes. Lean and hungry, but not like an ironing board like modern enduros.

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Timely thread this one.

FYI  I just weighed the TTR frame ( The bent one!!!) in the shed 11.7 kg.  

The prototypes had hand-built frames, custom stripped down wiring looms, Talon Hubs with excel rims or later ones YZ wheels, removed elec starts and batteries and linkless rear suspension.

I've gone nuts and only just finished stripping my TTR right down to its undies, and  weighing along the way. Ive retained lights, horn and electric start.  Gotta have a horn for when I pass the KTM s and 450s   

I've got the notes here.  

Alloy rear sprocket saved 1 kg.

lithium battery (WRF one fits but had to fiddle) saved 2kg,

removed toolkit was  - half a kg,

kickstarter lever - half a kg. Will go in the toolbox in the trailer.  It sticks out too far and has always annoyed me anyway. I figure if the starter dies (unlikely)  I can always bump start, ride back and refit the kicker if i have to.

GYTR muffler was 2 kg lighter than the stock one.

Stock speedo and headlight was 2.3 kg, aftermarket headlight only about 600grams ??

A box of road parts like rear guard extender, blinkers, pillion pegs and various stuff I dont need to trail ride weighed 3.6 kg.   There probably more bits laying around as well.

So by my dodgy maths I reckon I have stripped out about 11.5 kg fairly easily.  And you CAN feel the difference.

When I did my fork swap I think I only saved another .7 kg with the WP USD forks/front wheel, didn't weigh the triple clamps though.

So around 12 kg lost retaining the e start.

I'd guess she'd be about 120 kg? with half a tank of fuel.

 

 A long way of 104 kg.

 

-- Edited by Kaos on Tuesday 24th of January 2017 12:10:25 AM

-- Edited by Kaos on Tuesday 24th of January 2017 12:15:33 AM

Ha Ha Leigh I've been looking for that one I but cant find it. Well done. Thats the one with the white open enduros??

 

I also have a nov dec 99 Dirt Action with a ripper article on doing up the TTR250 i've kept.   I can put that up too.

Maybe a new thread for magazine articles??

 I just weighed the TTR frame ( The bent one!!!) in the shed 11.7 kg.  

 

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 what dose it weigh out side the shed?..."Sorry but I just couldn't resist that one"

 

My TTR is 112kgs with about 2 or 3  liters of gas... 

Sat both wheels on bath room scales and added the weights..

should be pretty dam close...

 

 

..

-- Edited by petenz on Tuesday 24th of January 2017 09:52:01 AM

Kaos wrote:

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I also have a nov dec 99 Dirt Action with a ripper article on doing up the TTR250 i've kept.   I can put that up too.

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Yes please! Post in new sub forum  

The prototypes all run an oil cooler. You can see the lines running up high in front of the motor, so its not the factory TTR oil cooler.

Could it be the Honda xr250 or 400 cooler behind the headlight, or similar???? Could be a handy mod??

-- Edited by Kaos on Tuesday 24th of January 2017 11:45:07 AM

I second that Simon, and I made a note so I'll remember to find that old Sidetrack magazine, bought if off Ebay for about $5 a few years ago.

 

Kaos - I think thats right, they all had different levels of modification, one had Ohlins suspension and the electric starter removed to fit a different carb, 

-- Edited by leigh on Tuesday 24th of January 2017 11:20:59 PM

Think that's the one

Of course I'm sure these will appear upside down. 

This has been a great read and the info is great off to the shed for some ttr time today 

Many thanks Leigh - a great read!!!

Couple of points:

1. An oil cooler adds 200mls of oil - not if it's a genuine Yamaha one - I reckon it's less than half of that.

2. 292cc option - anyone know how that is achieved - what sleeve and piston were used?

3. Balance cam left on the bench - balance shaft that sits in the front of the crankshaft perhaps?

4. Note the shorty header on the tricked up TTR on page 52 Steve 

Excellent stuff 

Brian

PS Any chance you can copy your post onto the new Magazine Articles etc subforum by starting a new thread "Sidetrack Magazine Re-Born" - please Leigh?

Kaos wrote:

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I noticed the shorty header AND the oil cooler fitted together. Is the cooler mounted higher??

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 Well spotted!

Looking at photos of the oil cooler on my 325 it seems to be fitted in the same place. 

Maybe I should try a shorty header again 

Brian

Hi Steve

I haven't got an oil cooler fitted at the moment but as soon as Steve has sold the 250cc engine currently fitted and on test, I will refit my 325 engine with oil cooler and try a shorty header again 

Buy the engine please someone! 

Brian

That short header looks to drop down a bit lower
than the one Steve sells... Steve's one sits
a bit flatter... look at my bike 2morrow..





..

Now I need to get an oil cooler here to see if I can get it to fit.

Wow that shiny header looks very trick. Yeah the bend looks lots tighter on yours Brian.

What effect on overall engine power do they give. I assume shorter pipe means more hp, means less down low, more up high. is it noticeable to ride.

-- Edited by Kaos on Sunday 29th of January 2017 01:04:09 AM

Wonder if Steve's got the internal plug/bolt to redirect the oil though a cooler..

A cooler 75mm x 150mm will fit with the short header...

I do a lot of quite slow forestry riding .. a cooler would help...



..

yer I did see that one.... thought they had a machined end with no thread...

I must have been dreaming....again..






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