XR600 Modifications.

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06/10/2003 at 17:38
Ok as you was all hijacking my bike pics thread I thought I'd start this one instead. This is strictly for XR600 owners only...errr...and me!
Ok, this notchy throttle thing. I thought this was caused by teh removal of the backfire screen thingy?
Feel free to write about any mods you have made to your XR. Cos I is interested to learn about teh XR600. Did someone say they like to blow thier fork seals??


http://tickers.tickerfactory.com/ezt/d/4;10714;109/st/20081225/e/Christmas+Day%21/dt/5/k/3241/event.png




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06/10/2003 at 18:13
I believe the XR6 uses the same carb as the 650, which also suffers the stutter from a closed throttle.

I believe careful jetting on the pilot can ease the problem a bit on the 650, but a lot of it is down to damage the carb inflicts on itself due to poor design.

Mine is irritating when you're trying to get the power down early while still cranked over - you can do it, but you just develop this subconscious ability to dip the clutch, give it a few revs and then feed the clutch out after its got its little tantrum surge out of the way.

It's certainly not a major problem unless laptimes are a consideration, or you're not prepared to ride round the problem until you'd rather spend the £££ on another carb.

IMHO, of course.
06/10/2003 at 18:23
Taipan,


I think you meant to write that the stumble is cured
by removing the screen?


Stoo's right, the problem can be ridden round,
you just have to re-educate throttle hand as to
timing and twist to apply at low throttle settings.

Fine on dry roads, more awkward on dirt/wet roads/ice.


best bet seems the replacemet carb.
(i'm watching Stoo to see how this goes)
06/10/2003 at 19:06
Darth Bear wrote

best bet seems the replacemet carb.
(i'm watching Stoo to see how this goes)


It's not as easy as it looks.

I can't remember when I rang Allens to order the carb - whether it was a week ago or 2.

I speak to this pretty helpful guy who seemed to know what I was talking about, or at least pretended pretty well

Said he had one in to suit an XR600, but not a 650. Wasn't sure if the difference between them was jetting related, or manifold stuff, so decided to hold off and get the 650 one ordered up.

They said they'd get it in, and give us a bell. Should take a week or 2.

Rings up again this afternoon. "Oh, no - we ain't got one of those in. I can order one up, but you'll have to wait for the delivery to come in. It'll be at least a couple of weeks"

Alarm bells are ringing, so I fires off a couple of precautionary emails to Bergos (who're shut on monday and don't accept credit cards) and XRs only (not much form to go on, but Hawkman seemed to recommend em).

If I do manage to get one, chances are I won't be keeping quiet about it, so no doubt you'll hear of any progress
06/10/2003 at 19:27
I'm all ears



hmmmmmmmmm decisions decisions

new carb?
new boots?
new arai?
new DVD-burner?

06/10/2003 at 19:37
Well, boots, helmets and porn-burners don't make your bike go faster
06/10/2003 at 19:49
need new booots


got some sidi vertebraes, but you cant wear em at work all day.


got some cheap Oxstars at NEC last year,
they leak like a seive!!!


OK for £40 though.


fancy some goretex lined boots this Nov. @ NEC
06/10/2003 at 20:22
I seem to be alone in not detesting the stock XR600 carb... I've been running my XR on the road for 3 years now and have never really has any issues with the carb apart from an icing problem. The initial reponse as you crack open the throttle is certainly not an issue, its sharp but not really any more so than the KTM Duke Series 3 I had before.

From what I have been told, and based on my own experience I suspect that a lot of tuning work etc concentrates a little too much on free-up the intake of the XR in order to maximise the tope end power output. It wouldn't surprise me if this in turn tends to screw up the initial delivery.

My bike benefitted from a long setup period, with perhaps a total of 30 or so dyno runs and loads of test rides covering various carb/exhaust/jetting options. The end result uses a pilot jet considerably smaller than most people end up recommending, and the retention of the backfire screen. Despite this my bike still puts out a respectable 50bhp at the rear wheel - which seems to be about the limit for most XR6's.


It is better to have loafed and lost that to have never loafed at all...
06/10/2003 at 20:28
Fatman wrote

From what I have been told, and based on my own experience I suspect that a lot of tuning work etc concentrates a little too much on free-up the intake of the XR in order to maximise the tope end power output. It wouldn't surprise me if this in turn tends to screw up the initial delivery.

My bike benefitted from a long setup period, with perhaps a total of 30 or so dyno runs and loads of test rides covering various carb/exhaust/jetting options. The end result uses a pilot jet considerably smaller than most people end up recommending, and the retention of the backfire screen. Despite this my bike still puts out a respectable 50bhp at the rear wheel - which seems to be about the limit for most XR6's.


Interesting. Mine only got 42bhp with FMF header/Arrow can. Kept the mesh (didn't know about the mod at the time). But mine was running slightly rich, so maybe smaller pilot would have helped? I thought my XR needed more mid to top end oomph to keep water-cooled technology at bay... Just prefered at slick throttle control and hence smoother delivery of power is all. A kick in the seat is OK for wheelies, but not when you're cranked over in the wet or backing it in IMHO.

R.A.T.6

Don't have a supermoto, now I need viagra.

Crashometer
2006
2005: thats racing... and black ice...
Crashometer 2004:
Crashometer 2003:
06/10/2003 at 20:33
I'm with Fatman - not really got a problem!? No dyno testing yet though.

Mines stock other than tail pipe and uncorked filter and main jet upped to 160.

Guess I just ride round any probs (or am too unskilled to really notice muuuuch probs ) It adds 'character' IYKWIM

drinking is not the answer, but it may help you forget the question :burp:
06/10/2003 at 20:47
Hawkman wrote

Interesting. A kick in the seat is OK for wheelies, but not when you're cranked over in the wet or backing it in IMHO.


By shapr I meant more like instantaneous, it nothing if nto controllable. Certainly grip ain't a problem...

The single "best" thing about the chnagesmade to my XR, aside from hogging it out to 660cc (cue amercian drawl..."there ain't no substitute...") was to get a load of crap removed from the flywheel. The motor now picks up like an old tractor has no right to...


It is better to have loafed and lost that to have never loafed at all...
06/10/2003 at 21:07
Fatman wrote

The end result uses a pilot jet considerably smaller than most people end up recommending, and the retention of the backfire screen.


This was what I was talking about earlier. I nearly bought an XR600 years back. I read tons of stuff on the web about them first, as you do. The one thing I do remember is the debate about airbox mods etc. Scott Summers seemed to have a "little success" with an XR. Check out his top ten tips for XR 600 tuning
Looks like we got some good knowledge on here!!!


http://tickers.tickerfactory.com/ezt/d/4;10714;109/st/20081225/e/Christmas+Day%21/dt/5/k/3241/event.png




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06/10/2003 at 22:37
WHat about fork seals? More than one person has mentioned to me about how XR6s blow fork seals. A few I've seen for sale, like the one on ebay is sporting "new fork seals". Is this quite a problem then? Is there no mod for this?


http://tickers.tickerfactory.com/ezt/d/4;10714;109/st/20081225/e/Christmas+Day%21/dt/5/k/3241/event.png




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07/10/2003 at 07:58
Leave the fork boots on, so you don't know when they've gone?
07/10/2003 at 08:02
Fatman wrote

Despite this my bike still puts out a respectable 50bhp at the rear wheel - which seems to be about the limit for most XR6's.



50bhp???

My XR600 has an HRC cam, 628cc big bore, Hi-comp piston, ported head, yoshi/arrow pipe and 41mm flatslide carb and on X81's dynno read out 47bhp.

What have you done to yours?

Tiepin - I love XR600's - top bikes - not the lightest/fastest but they have loads of tuning bits available and they last forever.

Mine never went through more than a pair of seals in it's life so I know nothing of that story.

GOD BLESS ENOCH POWELL

KTM LC4 640 SM.

Fairings are for HOMOSEXUALS

Walking in town the other day and I spotted a piece of walking excrement. I pointed it out to the wife. She could not see it. I pointed again but to no avail. I took her right up to it and nearly stepped on it ... oh that she said. No dear, thats a copper.

07/10/2003 at 08:13
Taipan wrote

WHat about fork seals? More than one person has mentioned to me about how XR6s blow fork seals. A few I've seen for sale, like the one on ebay is sporting "new fork seals". Is this quite a problem then? Is there no mod for this?



I'm GUESSING here, but i think blown seals are more likely to be associated with over-pressurised forks.


having said that, any xr600 pilots can tell me what pressures theyve put in their front forks?

(I havent messed with mine yet)
07/10/2003 at 08:19
Darth Bear wrote

I'm GUESSING here, but i think blown seals are more likely to be associated with over-pressurised forks.


having said that, any xr600 pilots can tell me what pressures theyve put in their front forks?

(I havent messed with mine yet)


I never did. Always bled the air out once a week. But mine were revalved.

Dunner has mine now - Dunner? Duuunneeeerrrrr?

GOD BLESS ENOCH POWELL

KTM LC4 640 SM.

Fairings are for HOMOSEXUALS

Walking in town the other day and I spotted a piece of walking excrement. I pointed it out to the wife. She could not see it. I pointed again but to no avail. I took her right up to it and nearly stepped on it ... oh that she said. No dear, thats a copper.

07/10/2003 at 09:37
Never had any problems with fork seals in 3 years and over 10k miles. However I have either had fork gaiters or slightly less baggy looking neoprene based fork protectors on. Stock valving etc...


It is better to have loafed and lost that to have never loafed at all...
07/10/2003 at 10:15
What kind of damping adjutment do XR forks have, if any? If teh earlier ones dont have any adjustment, do people fit racetech emulators etc?


http://tickers.tickerfactory.com/ezt/d/4;10714;109/st/20081225/e/Christmas+Day%21/dt/5/k/3241/event.png




http://www.sloganizer.net/en/style7,Taipan.png

07/10/2003 at 10:27
Darth Bear wrote

I'm all ears


Well, just as I was about to spit the dummy and work out how to order one from Bergos.... Allen's rang me up to tell me it had arrived in stock.

Should be in the post shortly. I've been advised to use a KTM SC throttle tube + cables with it, so I guess I'll need to go find a KTM dealer now
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