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  #1  
Unread 04-25-2016, 01:22 PM
link link is offline
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Default td3 tz 250 expansion chamber info or specs help

Hi all i have some computer software to do chambers and hydroform them myself. I need to make some for the td3 i am building and ask if anyone can help. The new software is a lot larger pipe than td3 std and I am pretty sure yamaha knew what they were doing so I am a bit stuck. Are the td3 pipes pretty good or are later tz ones much better or do I trust the computer software? any specs or old race mods from in the day would be great and help make a decision.Thanks Link
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  #2  
Unread 04-30-2016, 10:03 PM
170plus 170plus is offline
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From the depths of my memory, I'd head for the 250F/G pipe.

Modern (simplistic) software will probably give you a much fatter belly section in its pipe design, which will not work with the restricted transfers in the TD3 cylinders. The water-cooled bikes had better transfers, but nothing like a modern 125/250. The TZ350/750's are also problematic in this area.
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  #3  
Unread 05-02-2016, 06:31 PM
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Default thanks now i need new specs

Hi 170 thats sort of what I thought. The g were cross over werent they and would anyone have some specs on them or f for that matter. I have searched the site and internet as best as I can but no luck yet. Thanks a lot Link
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  #4  
Unread 05-03-2016, 12:08 AM
170plus 170plus is offline
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350F/G were crossover, but not the 250G. Might have some drawings...will have a scratch around my computer..

Incidentally, the 250F pipe (working from memory here-jump in anyone who knows better) was the same as the 250G pipe, but the exhaust outlet didn't match the F cylinder, as it was intended for the barrel that was not ready for the F model and eventually appeared on the G.
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Last edited by 170plus : 05-03-2016 at 12:10 AM.
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  #5  
Unread 05-03-2016, 04:23 AM
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G JONES G JONES is offline
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Here's the 250G pipe from Greg's book - the dimensions agree with a Factory Service sheet I have - although that's a bit too faded after all these years
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  #6  
Unread 05-03-2016, 05:01 PM
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Many thanks Kerry I will start cutting.They are very big compared to what I have specs for. Many thanks to G Jones also.Thanks Link

Last edited by link : 05-03-2016 at 05:03 PM.
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