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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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  #2  
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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  #3  
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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  #4  
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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Old 7 Feb 2010
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Pigford, I don’t have the stock gas cap on my bike’s tank, so I’m not sure if there might be a ventilation problem?? At wide open the bike needs the most gas…

Not likely I know, but you already have covered all the sensible stuff..
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Old 8 Feb 2010
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Acerbis 20 ltr tank - full to the brim, cap vent works good - even tried with the cap loose...... Same thing
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Old 8 Feb 2010
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I like all my Bikes standard Ive got a now 10 year old YZ250 that touchwood has been 100% reliable like my standard 27 year old Yamaha 2 stroke road bikes were yet ive got mates who've modded their brand new YZ's, CR's and CRFX's and have had nothing but trouble with them and the CRFX lad has reverted back to standard.

No amount of tuning to my TTR600RE is gonna turn it into a WR450 and sorry to sound sarcastic but I actually think Yamaha know more about motorbikes than I do so I leave well alone and the lads who used to mess about with the two stroke road bikes were often burning holes in pistons and such problems.
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Old 8 Feb 2010
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Quote:
Originally Posted by Panzer View Post
I like all my Bikes standard Ive got a now 10 year old YZ250 that touchwood has been 100% reliable like my standard 27 year old Yamaha 2 stroke road bikes were yet ive got mates who've modded their brand new YZ's, CR's and CRFX's and have had nothing but trouble with them and the CRFX lad has reverted back to standard.

No amount of tuning to my TTR600RE is gonna turn it into a WR450 and sorry to sound sarcastic but I actually think Yamaha know more about motorbikes than I do so I leave well alone and the lads who used to mess about with the two stroke road bikes were often burning holes in pistons and such problems.
Good on yer Panzer, but I get more out of my bikes by tinkering & over the years learning about them by modifying.

I just couldn't have a bike and not make it "mine" by fair means or foul

I disagree with the statement inferring the manufacturers make their bike work best for US..... They actually make the bikes very compromised, as now-a-days they have to engineer them to comply to EMISSION REGS.

There isn't a mass produced bike that is made how I want - so that leaves me with only one alternative - MODIFY

Me 1970 Trumpet... not standard.....



Me Lawson 1170, 33mm smoothbores, JMC... etc



Me 1978 Z1000 - does 11.5 sec 1/4 miles....





And me TTR..... which happens to be the nearest to standard out of the bunch...



So sorry, but I just couldn't ride a bike that has fallen out of the showroom, and know theres another 100,000 + identical bikes whizzing around the country
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  #11  
Old 8 Feb 2010
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Yeah Pigford I dont mean to slag people off and I really love them Yammagammas more than actual 350LCs when they're done nice and when kids its essential that your fizzy or SS50 etc is two mile an hour faster than the next 50 but if my bikes rev smooth through the rev range I aint gonna start messing with jetting and plug chops though I often enjoy reading about other people modding their bikes.

I like your Bikes tip get a swing arm sticker for a YZ with Yamaha on it for your TTR my bike looks a lot better with one on and will stop it getting shabby if rocks hit it, tried getting a Bridgstone sticker like on my YZ but couldnt get one and they look really nice
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Old 9 Feb 2010
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Pigford, wow, nice collection.
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Old 9 Feb 2010
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yeah, sorry I sort of went off on one.... But I'm a bit passionate about me bikes......


UPDATE

Took the secondary (CV) carb apart this lunchtime to check the CV diaphragm. The rubber boot is fine, but the needle was a tad loose. I remover the needle and move the clip down one, from the middle of 5 positions. The manual is not too clear, but it look like there should be a small springy thingy undet the needle clip (keeping the needle pushed up against the retaining plate)? The small nylon bush was there at least. The bike runs a bit smoother now from 0 - 75% throttle, just the WOT thats lumpy
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  #14  
Old 25 Nov 2018
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need help so bad...
i have a 2003 ttr600. @I am looking for a set of inlet manifolds and a diaphragm for my carbs... after much googling and ebaying to not find many results... if anyone on here knows of an inline dealer I could buy from or some one who knows someone that would be amazing. many thanks, jay
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