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how much power? how much power?
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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

I haven't been everywhere...
but it's on my list!


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



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  #16  
Old 2 Mar 2010
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Thats a nice video

What is this? Intake manifold, but what do they mean "unrestricted version" "dethrottling supercharging power", is it a powerboosting product and what is that vent, is it gasoline directly into the intake?

KEDO - Product Details

KEDO - Product Details
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  #17  
Old 2 Mar 2010
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Hey, as i read it (in german) its to replace your're intake rubber IF it is restricted there. Sometimes bikes gets restricted as a lerners bike. Here in Denmark you need to have had you drivers licens for 2 years, or be over the age of 21 to be able to ride with more than 34 horses.

Most bikes can be restricted, and often its in the intake. I doubt that this is a part that will replace a stock part, and give you mere umf. Sorry.

The hosething is just for venting ot something like that.

Thats how i read/get it.
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  #18  
Old 3 Mar 2010
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G600: My 2 bikes are the same model, 2KF. And that model is suposed to have been manufactured 87-89. But my second bike are sold 90 in sweden and therefor it became a 90... According to Yamaha its a 89.
Yes i know, they changed the XT-model 1990.

I have tried an XT600 made 01, and I discovered a big difference, my 89 felt more powerful. The big difference is probably in the heavier wheight of the bike made 01. But this may not be all the difference!

I have heard from my local yamaha dealer that they may have changed the exhaust valves to another size(but I dont know for sure if it was 1990), so it could really be a difference in the XT-bikes engines whos listed to have 40hp against the elder ones who have 45hp. OFCOURSE on the crankshaft... Nothing else has been said in the specifications from yamaha.
Thats the only difference I know in the engines stock performance modifications. But it still could be some differences in the carburettors and different silencer-mufflers from one year to another AND in which country the bike has been sold.

/ Henrik
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  #19  
Old 3 Mar 2010
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Carlhenrik thanks.

From memory my XT550 I had years ago was more responsive and more “awake” than my current 2005 TT600RE. I suspect the ignition mapping of the newer bikes to be more “politically correct”, no doubt to fulfill some regulations…

The TTR600 (the last TT model before the TT600RE) had a kick start engine (not e-start like the TT600RE) and different ignition. Probably a CDI and not a TCI. There was a wire that could be unplugged (changing the ignition mapping) making the engine more powerful and responsive.

So… I’m 70% sure the newer Yamahas are running worse than they “should run” because of some regulations and retarded ignition mappings…..
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  #20  
Old 4 Mar 2010
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The 500 and 550 are lighter than the 600's xt. They were build more as offroaders, where the 600's, especially the later ones, are dualsports made for a lot of street use. The 500 and 550 probably has a lighter swingwheel, making them more happy to rev.
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  #21  
Old 4 Mar 2010
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With reference to the TTR and TTRE, I have both. The internal gearing and final drive ratios are different. The ignition is different, this is because one has a battery-one does not. The mystery wire on the TTR alters the ignition to affect noise and emissions regs, disconnecting it does make a small difference. The TTR does feel a little more powerful on the "seat of the pants dyno", this is probably also due to reduced weight, suspension travel and gearing. I run mine and the wife's (3x TTRE, 1x TTR). with airbox snorkel removed and Arrow paris dakar stainless pipe.
They are not powerful beasts, the only time I have ever managed to wheelie mine was by accident off road. That said, they will haul you and your luggage anywhere you want to go. I have run mine at approx 4500m with no no noticable difference in pulling power. with standard carb and jetting you should get good mpg too.
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