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Thread: Survey: 74mm bore up kit. Who or how many people want?

  1. #11
    Senior Member vanillagorilla1's Avatar
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    Interested. I've already done the 225 and 6 speed, but I'm always willing to dig deeper! I think at some point you need head and cam work to make the power.
    Ken likes this.
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  2. #12
    Member tumbleweed's Avatar
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    Quote Originally Posted by Skin Walker View Post
    Any idea what a "rough" price estimate would be?
    Engines only has bench mark for kit so far.
    EnginesonlyTTR.jpg

    I think that price is nice. But kit parts for $300 (market price) is 'my wish'. I guess need much much soooo much more number of order for make it happen with that kinda price. And this parts can't compromise about quality. I am throwing small piece of rock here right now for try to make mud slide.



    Dream is dream, idea is idea. Should we request to Yamaha for sale this bike? It's nice to have more choice but how much you pay for whole bike? So, I think tune up kit is no bad idea for TW/TTR enthusiast.
    XTW250showmodel.jpg

    Stock motor is best toughness motor for sure. I want to hear more member's voice.


    Thank you

    tumbleweed
    Last edited by tumbleweed; 03-13-2017 at 11:17 AM.
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  3. #13
    Senior Member Fred's Avatar
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    Attachment 86449 - "Invalid Link"
    Engines Only TTR option looks like a bit over ~$1,000 in parts and machine work.
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  5. #14
    Member tumbleweed's Avatar
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    Link revised to screen picture, I hope it work this time. Thank you for mention Fred. -tumbleweed
    Last edited by tumbleweed; 03-13-2017 at 11:18 AM.

  6. #15
    Member Boedy's Avatar
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    I would absolutely buy one. JE pistons will make you whatever you want, but you need to buy 4 of them and I believe they are about $150 each. All you need to do is send in the stock piston for them to base it off of. Been thinking of doing this and just rolling the dice on trying to sell the extra 3 pistons, but I have a ton of projects going on, and figured I probably would do this sometime in the late fall. But if you want to beat me to the punch, I'll commit right now to buying one as long as the compression doesn't go over 10.5-1. No desire to run high octane fuel. In fact, I think the perfect number would be 10-1 compression ration. That's what I'll be asking for if I do it in the fall. That compression ratio, cam from megacycles, I'll port and polish myself, free flowing exhaust (already got it), ttr crank and six speed (already have a 225 motor), and a descent carb. That's what my TW will ultimately get. I am hoping for upper teens/maybe 20hp. If I can get that, I would be content with the power.
    elime and tumbleweed like this.

  7. #16
    Senior Member elime's Avatar
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    Quote Originally Posted by Boedy View Post
    I would absolutely buy one. JE pistons will make you whatever you want, but you need to buy 4 of them and I believe they are about $150 each. All you need to do is send in the stock piston for them to base it off of. Been thinking of doing this and just rolling the dice on trying to sell the extra 3 pistons, but I have a ton of projects going on, and figured I probably would do this sometime in the late fall. But if you want to beat me to the punch, I'll commit right now to buying one as long as the compression doesn't go over 10.5-1. No desire to run high octane fuel. In fact, I think the perfect number would be 10-1 compression ration. That's what I'll be asking for if I do it in the fall. That compression ratio, cam from megacycles, I'll port and polish myself, free flowing exhaust (already got it), ttr crank and six speed (already have a 225 motor), and a descent carb. That's what my TW will ultimately get. I am hoping for upper teens/maybe 20hp. If I can get that, I would be content with the power.
    I took a 70mm Wiseco and installed it in one of my TW's. I rejetted the carb to run leaner, #112 high speed jet, and with 1500 miles on it the more I ride it the better it gets. I think the rings were seated long ago so maybe the leaner mixture is burning carbon out of the exhaust port making for more power. I am just guessing that.

    Displacement is 214 and the compression ratio is 9.9:1 This was stage 1.

    Stage 2 is to install the MegaCycle cam I have for it. I have the 26100 model camshaft. I haven't installed it yet -- it is running so well I would rather ride it than work on it but sooner or later I will install it -- hopefully sooner if I get the energy.

    I took a 67mm Venolia piston, 11:1 or 11.5:1 compression ratio and sent it to Venolia and ask them to make me a 70mm model, which they did for a mere $200. Ouch!

    Picture of the 67mm Venolia along with a 68mm Wiseco and a stock 67mm Yamaha piston.
    P7210016.JPG

    Stage 3 will be to install the 70mm Venolia. It no doubt will require valve clearance and maybe some dome reduction to lower the compression ratio down to 11.5 or 12. The dome is solid and a lot of metal can safely be removed if necessary. I have no trouble using the high octane gas. I have already invested so much what is a few more pennies per gallon for the good stuff. And if necessary I can always add octane booster................
    tumbleweed, Boedy, Yamaman and 1 others like this.
    Long live the internal combustion engine!

  8. #17
    Member Boedy's Avatar
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    Any progress on this? I'd like to buy. I could even take the lead if people want? I've got my ttr225 motor just waiting to be torn into.

    elime- those pistons look cool, especially that Venolia! I have no problem with running 93 octane, but when you start getting up to 11-1 and higher ratios, you may find that race gas is needed. That's what I want to stay away from. I know from past experience that 10.5-1 in an air cooled single will run fine on pump gas, so that's my bench mark. Last thing I want is to build an awesome engine only to find that it needs race gas. And I can't tell if you were joking about the octane booster or not, so I'll just let that one lay undisturbed...

  9. #18
    Member tumbleweed's Avatar
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    Hi Boedy,

    Thank you for comment and interest. Number is way too below for make it happen so far.

    Regards,
    tumbleweed

  10. #19
    Senior Member elime's Avatar
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    This company's big bore kits are supposedly 11.5:1 and they claim that 91 octane pump gas is all you need.

    ENGINES ONLY The Performance Specialists since 1990
    littletommy likes this.
    Long live the internal combustion engine!

  11. #20
    Member TheLuigus's Avatar
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    Hi, guys. Sorry i haven't seen this discussion thread until now, but I have all of this stuff, and I'm very close to having it back together (you can use me as a test case). Frank at Engines Only helped me out and made me a kit, but I had to find a couple other people to get in on the deal. The deciding factor was the piston coming in batches of four, so if you can get close to that many people together, he will most likely work with you. I have his number in my phone and can call him to set stuff up if you guys want.

    If you want to know the cost so far, I'll try to ballpark it from memory (might be off by a little).

    Kit was as pictured on the site: 600 (at the time he couldn't do the cam stuff)
    Cylinder head port/polish and valve inspection: I think it was between 300 and 350
    Cam from Web-Cam plus valve springs: 250ish
    I also went with a more open exhaust, k&n intake, and new carb, but you don't have to

    225 conversion
    widening cylinder opening in crankcase:100-150 (or do it yourself, I couldn't)
    new crank on ebay or here in the classifieds: 50-100 (more if you need to convert the timing chain too)
    more costs would be associated with the transmission and clutch, but that isn't within the scope of this discussion

    Let me know if I forgot anything, or if I can help. I've been wanting to bring some more business his way, but my thread never took off like this one!
    elime and tumbleweed like this.
    Soon to be TW250! - Jimbo Shield, Mule Nuts, Cyclerack, Tinman's Tool Tube and Pannier Mounts, DMO Footpegs, Lizrdbrth Cooler

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