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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Old 14 Mar 2020
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Question Yamaha XT 600 - Max speed only 120-130 km/h

Hello everybody.
I have a question for you.
A problem came up with my XT 600 bike (3TB 1992)
For some reason the bike has no real top speed.
In the fifth gear with half throttle, it goes with 120-130 km/h, and it does not matter if i turn the gas handle to max, the motor not accelerate further.
I think i bought the bike with this problem exist.
But i don't have any clue whats the real reason of this.
It has a 15-47 chain ratio on it.
I use "34L" cylinderhead, and stock "3TB" (Y26PV) carburetor.
When the engine is hot, it starts perfectly.
A cylinder and cylinderhead are fully repaired, valve clearance are good, it works as it should.
And it also has stock exhaust muffler too.
It think that the main jets are too small, but i disassembled the carburator and everything is set up as it is in the Service Manual (In 3TB manual).
Is the problem that the engine head is from a different XT series bike (34L), and bigger jets needed?
Thanks for your help in advance.
And sorry for my bad english.
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34l, speed, xt 600, y26pv, yamaha


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