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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.
Photo by Andy Miller, UK, Taking a rest, Jokulsarlon, Iceland

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Photo by Andy Miller, UK,
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  #31  
Old 5 May 2014
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Hi guys I will need to take the fuel tank off to get a photo and have not had a chance . But I did find one thing ! Every now and then I could smell fuel in my shed and I was looking into it yesterday and I found the small fuel line from the fuel bowl of the main carb to the bottom of the secondary carb had a small crack and when I touched it fuel would leak out , so I guess when secondary carb was open it would have sucked in some air ? ? So after I replaced it I went for a thrash and it was pulling a bit better ! still wouldn't go over 140 but it got there faster, witch is what I like to feel.
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  #32  
Old 11 May 2014
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Originally Posted by THUMPTHUMPTHUMP View Post
MY 90 will do 100 mph. I had to switch to air pods and 135 mains in both carbs and raise slide needles all the way up. The biggest problem is the ignition timing. My 86 has a max advance of 36 degrees vs the 28 max in the 90. With the same air box and jetting changes the 86 will leave the 90 in the dust and has a top end over 100 mph. You willing to avoid deep water crossings, clean the air filter often and drop your mpg to 45 to go 100 mph? you cant have everything. thumpthump
This is quite interesting. The XT6 has nice torque but is not really that powerful. I did uncork (exhaust, snorkel) my 2000 XT600E and expected a big change in performance (that is usually the case with corked up engines) but got nothing.



The headers are pretty big, so maybe the long intake “hoses” are the limiting factor? For example, the XR650L had to fulfill the same regulations, has similar low state of tune (compression 8.3:1?) but has way more power/torque after uncorking.
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  #33  
Old 13 Jul 2014
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Replacing the stock carbs with Keihin cr31's will improve your motors performance, you'll actually be able to accelerate when in 5th gear and wishing you had a 6th . Mike
Last edited by tall-mike; 13 Jul 2014 at 17:35. Reason: puncuation
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  #34  
Old 13 Jul 2014
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Originally Posted by tall-mike View Post
Replacing the stock carbs with Keihin cr31's will improve your motors performance, you'll actually be able to accelerate when in 5th gear and wishing you had a 6th . Mike
And the price is only?
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  #35  
Old 14 Jul 2014
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The price is ??? How fast do you want to go ???
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  #36  
Old 16 Jul 2014
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Mikuni BSR33 x2 - Raptor 660
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  #37  
Old 17 Jul 2014
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Well the old girl is back on the road After being board out to 620cc valve grind, port out the head, new 5th gears and all the bearings etc etc she running sweet . Still wont go over 140 km but it gets there respectively it has heaps more pull from down low sounds like I need to change the carbs if l want it to go better up top end ? so if you start to hear a bit of a wine in top gear ! stop riding it, as bits of steel from 5th gear will be pumped around in your oil LOL its not a good look . Its good to feel the thump thump thump again
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  #38  
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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  #39  
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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  #40  
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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  #41  
Old 26 Jul 2014
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Maybe 8th gear is missing....
Hahahaha
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