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TTR600RE easy performance mod TTR600RE easy performance mod
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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 6 Feb 2010
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TTR600RE easy performance mod
.......back a while, I had the exhaust system off my 2004 TTR600RE and noticed there was an excess ridge of weld just inside the headers, presumably to fix the flange collars on.

So today I decide to take them of & grind the weld off.....

I used my dremel and ground them down. The bike was all back together and ready for a quick blast into town to get a video for tonight from Blockbuster in less than an hour!

I can report that it has made a very positive difference - the bike is a fair bit sharper and has snappier throttle response. This is a mod thats well worth doing.

The only other engine mods to my bike are 155 main jet (std is 150) a freer breathing end can (unknown origin) and a Denso iridium plug (no real effect).
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Old 6 Feb 2010
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Heres the difference on my stainlees steel headers for my 2003 xt600e, damn theres a lot of material, ad im not even totally done with it:

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Old 6 Feb 2010
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Great tip Pigford.

I must get myself a dremmel. Did you get the headers off without problems? No seized bolts?

I recall you changed the main jet in the primary carburetor from stock to 165 to 155. Do you think the 155 jet is spot on? (you have the airbox snorkel out right?).

Who sells the jets? Do you have the part number for the 155 and 160?

One more thing… do you think it is better to remove the subframe to get the carburetors out?
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Old 7 Feb 2010
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Quote:
Originally Posted by G600 View Post
Great tip Pigford.

I must get myself a dremmel. Did you get the headers off without problems? No seized bolts?

I recall you changed the main jet in the primary carburetor from stock to 165 to 155. Do you think the 155 jet is spot on? (you have the airbox snorkel out right?).

Who sells the jets? Do you have the part number for the 155 and 160?

One more thing… do you think it is better to remove the subframe to get the carburetors out?
The header nuts come off easy - I did them when I first got the bike (with 6000km) and always use plenty of copperslip on them.

I took the snorkle out - but it didn't seem to make much difference so I'm running with it back in. I have a selection of mikuni jets (button head with a slot) which fit - so no part numbers. I only did the primary carb, coz the secondary needs special jets, but Yamaha only do up to 145 which is the std anyhow!

As for getting the carbs off I just undid everything (but not the sub-frame) and struggle for 10 mins to get them off - that was easy campared to getting them back on Probably best to drop the subframe

I do have one running issue which is at full throttle - like when giving it some to over take on faster roads. This bike hesitates, and seems to die and splutter every time! I've checked fuel flow to the carbs, buy wonder if I just need to get a bigger main for the secondary carb:confused1: Rest of the time its OK, starts good, idles fine..etc. Its just at full throttle in taller gears/longer blasts at hi-revs of more than 5 seconds

I've checked all coil connections, re-done HT cap fitting & swapped plugs, etc, to no avail.
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Old 7 Feb 2010
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I do have one running issue which is at full throttle - like when giving it some to over take on faster roads. This bike hesitates, and seems to die and splutter every time! I've checked fuel flow to the carbs, buy wonder if I just need to get a bigger main for the secondary carb:confused1: Rest of the time its OK, starts good, idles fine..etc. Its just at full throttle in taller gears/longer blasts at hi-revs of more than 5 seconds

I've checked all coil connections, re-done HT cap fitting & swapped plugs, etc, to no avail.[/quote]

It sounds like the filter in the carb is blocked, you need to remove float bowl, the brass tube that the float needle sits in is held in place by a philips screw remove this and pull the tube out at the end is a small filter when this gets a bit blocked it restricts the flow at high revs bike will spluter and cut out like its running out of fuel,
There is a diagram of the carb and filter on this site try searching carb filter.
Good luck
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Old 7 Feb 2010
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Thanx Bolla, but I did check it a few weeks back & cleaned it up but it wasn't really dirty.

It does sound like a fuel thing.... but I can't find an obvious problem
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