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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 1 Jun 2005
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Location: London,England
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TTR 600 Performance

I have a 98 TTR 600 in supermoto trim.It looks nice,sounds nice but I
am thinking it should be a bit quicker.It has a CRD pipe I think the
jetting is standard but it also has a different cam fitted I recently
had it dynoed as it was not running right (dirt in carb)after cleaning
carb it was running fine and making 36 BHP.I am sure it should be more
then this.
The bike pulls fine but seems to run out of power quickly,I have 15-44
sprockets.
Is the bike restriced by the CDI?
If so would I damage the bike by fitting an aftermarket CDI (from E
bay)or would it improve performance?
Could the modified cam be doing more harm then good?
I was told it would be better to have a standerd cam and get the head
worked on.
Is the standerd cam in the TTR the same as the xt 600 cam.
Has anyone put an XT 600 engine into a TTR if so was there any
problems with the front sprocket lining up with the rear ? also what
about the ignition system.
Hope some one can help as I would like a bit more power but still want
a reliable bike.
Thanks John
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  #2  
Old 1 Jun 2005
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I suspect the exhaust. CRD seems to be a small pipe, whereas we need volume.
Have you tested the carb setting under load, e.g. on a Dynojet bench?

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Old 2 Jun 2005
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Hi thanks for reply
You could be right about the CRD pipe as I have read about another TTR which had an aftermarket pipe fitted.
when he brought it to be tuned the mechanic suggested getting the standerd pipe modified ( cut open )then just adjusting jetting .He was gettig 44 BHP.
Do you have any thoughts about the different cam in my bike?
When my bike was dynoed it was just to get it to run ok after cleaning carbs and adjusting piolet screw, so I am not sure about carb setting under load.
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  #4  
Old 3 Jun 2005
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Personally I have no experience with different camshafts. But I think it should be one of the last mods in search for power. After exhaust, air filter, carb optimizing, hp piston, etc.
I know of 1 person who has fumbled with the cams and his bike never ran well with it. He put back the standard one.

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Fred, XTZ660, Holland.
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