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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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Finally! Good work guys. What a mission that turned out to be!
Time to put some miles on...

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Great news.....time for some tuning now :)

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awesome stuff guys...
i would love to see what these would make with some mods to porting carb airbox etc..
si

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Just spent an hour reading through this fantastic project.

Excellent work. Amazing persistence.

I'll get mine running first.

I got mine given to me as a non-runner. A mate and I have a couple of desert rides planned for 2019 - he's about a third of the way through putting a KLR650 sidecar together. I have been saying that the TTR is plan A. If it doesn't work as I expect, I'd go and buy something else. A practical 350 kit would qualify for something else.

Still, I've get mine running first.


Best of luck with this.

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A belated Merry Christmas to all. Have been checking this thread obsessively hoping for an update but Santa must be busy. How is the bike fairing?

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Hi Kimani!

Simon is in Morocco at the moment but he continues to sound very positive on his 350 build. I can understand why having ridden the bike myself a few months ago biggrinbiggrin

The last I heard from Steve was that he was also very impressed with his 350 build but is a very busy man so was struggling to put miles on the  engine.

However, the kit went together so well that we have had the confidence to order some more barrels from the foundry. I can't wait to get my own kit. I got a TTR250 ready for a power transplant......

Brian



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Hi Brian,

Thanks for the update. Glad to hear the bikes are doing well. I can volunteer to put some miles on Steve's bike but it would have to find it's way to me in Kenya Very positive news that the kit went together well - I can see great demand for used crankcases in the near future. I love my 93 OE and I believe a 350 kit would make it the perfect bike for me to commute, go trail bashing and tour a little. Will keep hitting the refresh button on this thread.

Wishing you and Trish all the best in the New Year.

Kimani

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Thank you Kimani - good to hear you are still keeping an eye on us wink

Not much to report by way of an update other than I spent some time with Steve yesterday and did some fine tuning on his 350's carb such that it is running even better now.

His kids are back at school from today and, hopefully, when he has caught up on his backlog of work, he will be able to finish running his 350 in smile

Brian

 



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Went out with the lads for a day in the Elan Valley area. Brother on the 350 having a lovely time spending most of the hillclimbs perfecting his "hovering the front wheel" technique. Bike runs a treat. Unfortunately (or fortunately, as it happened near the end of the day), some bits started falling off:

 
P1010891.JPG
 
Number plate bracket came loose and the rising wheel smacked into it, creasing the tubes and fracturing them after some more spirited bouncing around on Strata Florida (water was low, nobody drowned!) No weight on the rack, just bad luck (or over engineered number plate holder!) Wouldn't mind too much, but the frame's just been powder coated.
 
Further testing when it's fixed, but there's another batch of barrels and pistons on the way...


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bad news with the frame love strata florida

I should be out on my 350 in the morning ))



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... I'd like to get one of those from the next shipment of barrels and pistons! Are you ready to sell any sets yet?

I am ready to buy, if you are ready to sell! 



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the first batch are on order, 2as out on my 350 for a quick spin, flippin awesome. loving itsmilesmile

20190112_115553.jpg



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PS: ( ... you literally have me hanging on the fence right now. I've been waiting for the 350cc kit to be created, and released for sale before I tear down my TTR's engine. I'd really rather have 350cc than a mere 2mm overbore piston! )


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When I get the piston price confirmation we'll sort out a kit price and availability times. Hang in there!

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I can't wait........................

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Steve, is that headlight and bracket all custom?



-- Edited by bwaldo on Wednesday 16th of January 2019 11:58:09 PM

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Hi Brian!

I hope Steve doesn't mind me answering for him but it's 100% Yamaha - from a Raid model:

Raid pic - side view.jpg   Raid_Headlight1.jpg  Raid_headlight1_2.jpg  Raid_headlight2_2.jpg



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I want one of the screens for it, anyone got one?????



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Is that the Raid model headlight assembly? How do they mount to the forks?

I don't think Yamaha ever imported them here, for reasons best known to them only. They looked horn then, they look horn now.

If you see the South Australian Reliability Trials sartchampionship.com/ their bikes often have big diameter light bars, with big lights. Steve Warnes, from Better Bikes south of Adelaide was a primary source of modifications to allow them to fit lights onto enduro bikes.



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I too am waiting patiently. Just hope the shipping isn't too bad. Also, waiting to here what needs to be done carb wise...

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tripodtiger wrote:

Is that the Raid model headlight assembly? How do they mount to the forks?


Yep - Raid headlight assembly. The last pic of mine shows the back of the unit. The four supports sit on the forks and are held on by Jubilee clips IIRC. 



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Getting back on-topic

Just finalizing prices of head gaskets and we'll be ready for retail!

Brian and Steve are playing with carb settings on Steve's bike (#2), trying to get the mixture close with minimal changes (ie needle movement only). #1 bike is running Twinair filter, unmodified airbox, standard header and Motad end can (which is slightly more free flowing than a standard pipe) and I am happy with 48 pilot jet, 140 main, needle in the standard position.
I did run it with an FMF Q4 with no baffle, and the airbox lid off for minimal restriction, and a 48 or 50 pilot and 147 main seemed ok on the afr meter.
The upshot of this is carb mods will depend a bit on what pipes you're running, but some jetting changes are likely.

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My Bike is running 147 / 54 and needle on the bottom clip.

One-off exhaust (free flowing) (ran perfect on standard jetting))

Standard header pipe.

No Air box mods, with Twin Air filter.

Bike runs between 10.9 and 12.5 on the air fuel meter, between tick over and full running. 

More importantly it feels bang on, no flat spots, no over run bangs or popping, just pulls perfect all over the rev range.

Hope that helps.

Steve



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That's great news guys, glad all the hard works paying off!

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Thanks

Daniel Lee



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ttr steve wrote:

My Bike is running 147 / 54 and needle on the bottom clip.

One-off exhaust (free flowing) (ran perfect on standard jetting))

Standard header pipe.

No Air box mods, with Twin Air filter.

Bike runs between 10.9 and 12.5 on the air fuel meter, between tick over and full running. 

More importantly it feels bang on, no flat spots, no over run bangs or popping, just pulls perfect all over the rev range.

Hope that helps.

Steve


 10.9 to 12.5 seems a bit on the lean side...



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sweet cant wait till it goes retail its killing me hopefully the cost to get it to AU wont be to expensive


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10.9 is rich Pete. Stoich is 14ish and lean is above that, but I refer you to the link to AFR readings which I have been using for guidance:

www.safrtool.com/SAFR-AFR-values.asp

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Runs mostly 12.5 only 10.9 at very small point of rev range (taken the AFR off now)

Never seems hot and feels perfect to ride smile 



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Any update on the kits and how you guys are getting in with them?

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Kits are sweet and the bikes pull like a train, I have been struggling to get some miles on my bike (family stuff) but loving it so far smile there are 6 on order and should be in the shop soon(ish)



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Pistons 5 weeks into the order lead time.
Barrels been in the machine shop 2 weeks.
Head gaskets ordered last week, 3 week lead time.
We're all learning patience on this project!!

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mossproof wrote:

Pistons 5 weeks into the order lead time.
Barrels been in the machine shop 2 weeks.
Head gaskets ordered last week, 3 week lead time.
We're all learning patience on this project!!


The lucky customers won't have to put up with any of that as, in due course, they will be able to buy the kit straight off the shelf from Totally TTRs biggrin



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Steve - et,all..

Have you been able to figure out what you will be asking for a full kit yet?

... Inquiring minds want to know! 

Keith



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Here's an odd question. How much does the whole kit weigh?


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TTR Keith wrote:

Steve - et,all..

Have you been able to figure out what you will be asking for a full kit yet?

... Inquiring minds want to know! 

Keith


 Still yet to finalise the retail price.



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Forgorin wrote:

Here's an odd question. How much does the whole kit weigh?


 

Bigger hole, should weigh less!!

 

 



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tripodtiger wrote:
Forgorin wrote:

Here's an odd question. How much does the whole kit weigh?


 

Bigger hole, should weigh less!!

 

 Hahaha.  I've got a friend who might be willing to take it as carry on next time he flies out to see me.  Hope it's not too much...!


 



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Piston weighs 334g inc rings and gudgeon pin. Compare that with oem piston of 265g.
Barrel approx 1.7kg and is 19x17x11cm. Haven't got a loose 250 barrel to compare.
Currently about to fall out with my machinist...

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It would be interesting to see a dyno run of the 350 vs a 250.   biggrinbiggrin



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Scroll back to page 3 of this thread for dyno of the engine as a 250, then 350 with standard pipes etc.biggrin


Machinist has a broken patella thanks to damn diesel leaking tintop on the road 40 yards from his home.cry



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Thanks I didn't see the 250 part. Don't know if it was the speed reading or the Alzheimer's.

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Any updates...?

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I have sold all my tools and bikes and taken up knitting fog...

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biggrinbiggrinbiggrin

my 350 is running well, taking it to Wales 1st bank holiday in May, with 2 or 3 other ttr's.

machinist for the barrels is on a bit of a go slow, but hopefully they will be done soon and ready to sell.

I have just received the gaskets for them. smile



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Steve, are you going to Welsh Wales for the Taffy Dakar?


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not the taffy Dakar, but will be doing my own th8ng nearby..

you going?



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To the Taffy, yes. Ahhh, I was hoping for a cheeky spin on the 350 .

Lets hope the weather holds for that weekend.

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I will be in llandovery Friday afternoon, you would be welcome to come and have a ride.



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I was half joking but thats very generous of you. I won't be around until late Friday myself, maybe we'll meet on the lanes!


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I have a set of crank cases available which would be perfect for the 350 kit when it is available, please see: ttr250.activeboard.com/t65515306/for-sale-pair-of-matching-crankcases-from-20045-ttr250/

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