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Post Info TOPIC: 350cc Big Bore Kit for the TTR250 - updates and gossip!


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350cc Big Bore Kit for the TTR250 - updates and gossip!
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X 2
;)

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Can't wait to see how it goes 

When Yamaha took the 550 out to 600 it got more torque  but was a bit slower due to the recipricating mass the 350 should pull well 



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Got my crankshaft rebuilt with one of Steve's conrod kits in the optimistic hope that it'll run Simon wink

Another bit of TTR porn:

Rebuilt crankshaft.jpg



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Found any time for the engine this last week Simon?

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I hope to be taking my crankcases for machining tomorrow, I know Simon has also been crazy busy, so don't worry we will both be road testing very soonsmilesmile



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Crankcases are now in the machine shop, so getting a bit closer to road testing time.smilesmile



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What are you having done to the crankcase exactly?



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Steve's crankcases are being bored to take the bigger diameter sleeve as Simon had done - his photo below after boring.

Bored crankcases.JPG



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Ok, ok, i should have guessed. Fingers crossed for successful tests. I for one can't wait!!



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Engine's in the bike. Just deciding on jets for the carb, but sadly won't be done this w/end as I'm at the Adventure Travel Film Festival.
Keep the faith brothers, won't be long,
Simon.

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Ladies and Gentlemen, the world now contains 1 living breathing running Yamaha TT350R!!!!

After a few setbacks like delaminated inlet stub, and dropping a 48 jet into a black hole in my garage, tonight I took the plunge and gave it a go. Filter housing filled with oil, primed a bit on the kickstarter, got my brother to hold a camera, kicked the dogs out, twice, span her over without plug a bit, wound in a plug, 3 twists of the throttle and she went first go.

Yeeehaaa!

Hopefully we can get the footage into this thread, and if we do, I apologize in advance for the quality - just an old camera not an i-thing.

Twice round the field and the smoke cleared quickly (lots of oil in the bore from assembly). First impression: Oooh, this feels nice

There's a bit of pop on the overrun. Could be air leaking somewhere, could be mixture. I will be running with an air/fuel ratio (AFR) gauge, and dyno'ing when I've done some running in. It's too dark to play now.

Can't really believe it's finally happened!

Time for a beer. Cheers!

Simon.



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Awesome..;)

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Excellent new Simon!

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Epic!!

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Well earn't beer for sure, congrats!!

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Amazing, congrats!



-- Edited by robs on Thursday 16th of August 2018 07:40:22 PM

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Here it is, youtubed by ex MrsTTR Trish, many thanks Trish - you may have found yourself a job

Footage of 5th gear wheelies coming later, when it's run in a bit

www.youtube.com/watch

That was genuinely the first spin. The smoke from the assembly oil was gone before the first lap of the field. I'm not showing much emotion - shock I think!

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What a stupendous reward for you Simon, I bet you're over the moon.

Martyn



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Fantastic achievement Simon. I have been quietly following and can't wait to hear your real world experience riding it. One day, I will rebuild my 1993 OE and this surely must be the way to go. Well done.

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This is awesome news.. patiently waiting for the Dyno results..
Si

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