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


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RE: 350cc Big Bore Kit for the TTR250 - updates and gossip!
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I own TTR 250 and Suzuki DR 350. I had a chance to compare the cylinders. see the pictures. Seems like DR is smaller.

DR can be bored to 441cc or even to 480

http://dr350.wikia.com/wiki/Big_bore

 

It is probably cheaper and easier to buy second bike like DR 250/350 and bore it!



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learning to ride on 1993 TTR 250

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honda15i wrote:

It is probably cheaper and easier to buy second bike like DR 250/350 and bore it!


 Quite likely but it still won't be a TTR wink



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TTRfan wrote:
honda15i wrote:

It is probably cheaper and easier to buy second bike like DR 250/350 and bore it!


 Quite likely but it still won't be a TTR wink


 We're TTR addicts.



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honda15i wrote:

I own TTR 250 and Suzuki DR 350. I had a chance to compare the cylinders. see the pictures. Seems like DR is smaller.

DR can be bored to 441cc or even to 480

http://dr350.wikia.com/wiki/Big_bore

 

It is probably cheaper and easier to buy second bike like DR 250/350 and bore it!


Nobody's stopping you smile 

I think the DR350 is a bit of an old slug, but that engine in the better TTR frame would make an interesting project.

For comparison Bore & stroke 79.0 x 72.1, 349cc, 30hp (claimed), CR 9.5:1



-- Edited by mossproof on Friday 5th of January 2018 05:11:03 PM

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I hope its not to expensive to get the kit over here in Aus because atm 800 pounds is 1300 bucks and then import costs if i order it from you guys over in England if it gets to expensive i might just buy another bike to be honest. (I really dont want to) At the moment im paying for brand new CB500x so i cant really afford expensive mods

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I thought it would be a lot more to be honest, not being made in china.

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So is there a 350cc TTR up and running yet???

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You'll read it here first when there is

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mossproof wrote:

You'll read it here first when there is


 tease!



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Hope it won't be long before we are testing the first 2smilesmilesmile



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Good news. What compression ratio will the 350 be running?

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Sorry for the delay, been learning to ride sand in the Algerian sahara on my 325
I have requested approx stock CR from Wossner. Still awaiting some sort of reply from them regarding the order Wish I lived in the States - for many reasons, but in this instance so I could deal with Wossner direct rather than being forced to deal with a UK agent who's not really interested! Another reason would be so I could play in the desert without looking over my shoulder for beards in Toyota pickups with rear mounted HMGs!!
Simon.

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Been waiting 5 months for Wossner to deliver (6-8 weeks they told me!!) I've just been pointed in the direction of JE Pistons via Cambridge motorsports, and have set them in motion for a quote. Hoping to get somewhere soon and looking forward to the possibility of dropping TSR Performance (UK Wossner agents). Small batch numbers is a difficulty, which is why I've not been able to "negotiate" faster.
Believe me, noone is more frustrated by all this than me. TSR don't return my calls, just get fobbed off by the desk dolly. Fingers crossed I'll get somewhere soon. Sorry for the wait.
Simon



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no Name and shame! Thats terrible customer service!

Could always call them out on Twitter etc.. Would probably speed them up wink

Dan, out in Serbia now, got wet in his new "Adventure Boots." Complained on Facebook/Twitter to the manufacturer and they're sending some new ones out to him!



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Just appreciate your hard work Simon.

Result with the boots tricksmile



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That's such a joke Simon! Hopefully JE Pistons save the day!

It'll be worth it when you see a fleet of ttr250s lifting those front wheels in 6th gear 😆



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You have the patience of a saint Simon!

Thanks for sticking with it.

Wossner have let us down very badly evileye



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Is this the Holy Grail?

Pistons arrived from Wossner today (via TSR Performance). The story is Wossner moved factories in Jan and ended up with a huge backlog of work. Would have been nice to have been told that back in Feb, rather than treated like a mushroom, but there we are. I've now got 4 shiny 86mm pistons in my grubby mitts. Off to the machine shop to bore the sleeves and away we go.....

P1010802.JPG



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The excitement is killing me!!

Cant wait!

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I'm wiping the drool off. Awesome. :)

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I hope it all goes well, wea need the extra cc in our lives haha

Looking forward to hearing how it goes!

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Wow - the Holy Grail has been found!  biggrinbiggrin

What great news to wake up to Simon.

You will have to warn those chickens that they will have to find a new home wink



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Yes yes yes, better get my crankcase sorted ASAPsmile



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I'll get the barrels down to the machinist this week Steve, then send you one down so you can get the hole bored out properly.

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How exciting

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Very nice!

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Oh yes this is good news

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Can't wait, so excitedsmilesmilesmile



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Well it all fits together and the crank turns smile

P1010804.JPG



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Please make a video when you start the engine and do first ride



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Great too see! Keep up the good work, we are all excited Simon!

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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. thumbsup.gif

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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