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XT600E wont go over 140 km ??? Help !! XT600E wont go over 140 km ??? Help !!
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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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  #1  
Old 27 Apr 2014
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XT600E wont go over 140 km ??? Help !!
Hi , I have a 91 XT600E done 40,000 + Km . It runs well pulls like a school boy! It will get up to 130 km and after a loooong strait I can get to 140 km !:confused1: I am running 16 frt and 45 tooth rear ?? , I have gone over everything I can think of from dyno tuning carbs dialing in cam free flow exhaust fitted a better coil . I have not been able to ride an other XT600E to compare,Am I expecting too much ?? How do your XTs go ? I,m not after a race bike but a bit more go would be useful in all the gears so if you can let me know that would help. Thanks
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Old 27 Apr 2014
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Original its 15/45 and top speed marked as 148km/h. Maybe you need to buy a R1 if you like riding from 140-280km/h
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Old 27 Apr 2014
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Looking at your problem.... it is not a problem!
130 Km/hr is already 80.778mph so... you are already achieving over the prescribed max speed limit in NZ tsk tsk tsk
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Old 27 Apr 2014
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It's a 23-year old air cooled single dual purpose. Exactly how fast do you think it should go?

Use the right tool for the right job.
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Old 27 Apr 2014
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Go 15 in front or 47 in the rear, it should help a bit.
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Old 27 Apr 2014
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Quote:
Originally Posted by Jens Eskildsen View Post
Go 15 in front or 47 in the rear, it should help a bit.
Then he will get lower top speed, with the gearing he has its suppose to give more than 140 so its low. Maybe take a compression test on engine.
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Old 27 Apr 2014
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Speed?
If you want to go fast, 16 or 17 front, 42 back, but then don't take it on a dirt road in the mountains.
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Old 28 Apr 2014
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Originally Posted by xtrock View Post
Then he will get lower top speed, with the gearing he has its suppose to give more than 140 so its low. Maybe take a compression test on engine.
140km/h is only 5700rpm on stock gearing. He will be able to rev higher with the bigger rear sprocket for added top speed, without being anywhere near the revlimiter.

Its different from bike to bike, a xt350 pulls to just about redline when stock, and need a smaller rear og bigger front, as it runs out of revs before the power is gone.
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Old 20 Jul 2014
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I noticed you've got a relatively high fairing mounted on your bike in addition to a top box. At 140 kmh the wind resistance at the front would be massive. The top box most likely adds suction at the rear, like a vans rear end. Maybe that could account for the lack in the last 8-10 kmh at the top? Have you tried uninstalling it and see how big of a difference it makes?
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Old 20 Jul 2014
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Cost of the Keihin cr31's about 400us then add 300 for a dyno tune. The cost is high, but the results are substantial. Mike
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Old 25 Jul 2014
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I havent tryed it without the screen etc but now l know how it is to have that big screen l dont want to go back to streching my arms , I know l want the best of both worlds :confused1: but l just want a bit more go ! can anyone tell me dose a mid 80s tt600 cam fit my 91 xt600 and are the cam lobes on the tt600 a bit more sharp looking ? Thanks
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