Erratic idle on XR600

[Mick DMember]

My brothers XR600 has me scratching my head. It still has the stock carb and a reasonably new 630 kit. The thing will idle beautiful,but when you rev it it doesn’t return to idle, it will rev at quarter throttle and if you give it another rev it will either return to correct idle or it will go to about half throttle so you have to give it another rev in the hope that, it will go back to the correct idle then.
All good fun when you are going down some snotty hill with erosion mounds!!!
It has new throttle cables and I looked to see if the throttle is returning to the stopper on the carby (were you adjust the idle) and it is, so I am thinking that the slide must be sticking or something. You can hear the slide bottom out quite hard so I dunno WTF is going on.
At one stage yesterday the bike was on its stand idling while we shifted a tree blocking the track and all of a sudden the thing decides to start revving it’s head off for no reason like it was about to run out of fuel.
It is also prone to cough stalling in tight sections and when it does that it is a right slut to start and what is worse, it appears I am the only one that can get it to go,so every one stands around yappin while I have to kick my guts out.
I am thinking he should get a flat slide Mikuni for it but my brother’s missus ( she is only five foot tall but savage as hell) won’t let him spend that kind of money on a bike she didn’t want him to have in the first place.
A pat on the back and a firm hand shake to the person that can shed some light on what is going on with the cranky thing.

[ChrisMember]

Hey Mick,

I’m sure trailboss could help on this one, I spoke to him today and he should be checking in this evening, access permitting, he’s got some great stuff from the finke, can’t way to see what he managed to bring home.

P.S. sorry i can’t offer any assistance that’s what mechanical minded friends are for;)

[GregMember]

Mick
Check for wear in the slide and carby body, also check the needle into the carb body. I reckon where the needle goes down into the carb body will be worn or the slide in the housing. Has it done much work Mick? Also check the intake boot for being cracked between the carb and head, or sucking air??
Chicken bought my old 600 of me and replaced the carby and said it the best thing ever

Benny number 1 at Finke 2008

[BrettMember]

Seriously the best thing to do is buy a flat slide from Ballards, or the USA, it starts like a dream, first kick in a big frost, gets rid of the big flat spot after a jump, increases the fuel economy and performance like nothing else, hammers hard, one only throttle cable which comes with the kit, dog shit simple bolt on and ride away, no rejetting required and also consider you choices, if you want to trade your snakey wife and get life long friend, get a dog.

[Mick DMember]

It aint my wife that is snakey it is my brothers. Mate, my missus is a gem,you only have to look in my shed to see what she puts up with.
I have found another standard carby on Japan’s version of ebay for $20.
They also have brand new FCR41 carbs for about $360 + freight (about $40),I also got a brand new kickstarter for $16.
I am presuming that the ones at Ballards are the Mikuni 41ml?
Any idea what they end up costing? With our dollar so strong in the U.S a fella should have a look there as well.
To answer trailboss’s question the old girl has about 18000 km on it,
I pulled the carby out and cleaned it all out and noticed it has no choke plate so I think it is time for a new carby.
I also sprayed some WD40 around the intake boot to check for leaks but it made no difference.

[GregMember]

Leave the choke plate out champ, they crack and fall into the engine, my XR650 one was removed by the race team. I fitted the ballards one piece to it as they dont crack

[BrettMember]

Well mate, Ballards cost was approx $430.00 and made a world of differance to my old tractor that I now push my mate on his tricked up XR 650.,I wish ! but its so good buy a flat slide 38mm and stop mucking with your old carby, the difference is incredible

[ChrisMember]

Just out of interest…

Monday, June 9, 2008

1 Australian Dollar = 0.96313 US Dollar

[ChrisMember]

So thats where the name Chicken Came From!!!!
That should be your avatar instead of the insulin tanker.

[Mick DMember]

Yeah I knew they had a problem with the choke plates snapping off. This carby hasn’t even got the shaft in it, to screw the plate to.
I’m thinking I might just lash out myself and put a new carby on my XR and give him mine.
I actually own my brothers XR, I bought it so he wouldn’t keep borrowing my good one. He is notorious for crashing through scrub and parking bikes horizontally.
I bought it on the internet and when it arrived it didn’t quite fit the description ol mate gave.
He forgot to mention that the recoil spring in the kick starter was cactus and that the rear shock linkage was flogged out or that some clown had painted it with a paint brush.
It starts easily cold, it is just when she gets hot it can be a bastard,I am thinking maybe stator as well.
It was ugly as sin when we got it, so the first bit of wet weather that we were stuck in the shed, we did this to it……….

She gets some comment now.

[Mick DMember]

Hey Chicken,
Is there any reason you bought the 38mm as opposed to the 41mm mikuni?
Do you guys think there would be any benefit to buy the 41mm for my bike as it has the 630 kit?
cheers
mick

[Mick DMember]

Just bought the 38mm mikuni off Ballards $429.00, It will come tomorrow and I will fit it tomorrow night,oh shhit the State of Origin is on.Thursday then.
I went for the 38 as Geoff Ballard reakons the 41 is a bit big for a weekend warrior bike,if you wanna get serious you go for the 41mm.

[GregMember]

Well what happened? how did it fit up? Is it as good as chicken reckons, I know it made a difference to his bike

[Mick DMember]

Oh, you guys are back? I have been hanging around here on my own for the last couple of days,feeling like Freddie no friends!!! The carby bolted in “dog shit” easy as chicken said considering it came with no instuctions or procedures. 1 hr and I had the thing idleing after 5 kicks. I had to dick around with air mixture and the main jet as it had a bad bog off idle at first and I had a bit of an issue with the cable routeing as it would rev up if you turned to the right but I think I have that sorted now as well. I don’t think it is still quite right but I will hit the bush today and give it a test. I rode it around the block last night and it will wheelstand in 3rd by just winding the throttle on, it didn’t do that before!!! I have noticed a change in the power curve, for the good or bad I will see today.

[GregMember]

Come on mick we wouldnt leave you, shold come on that ride though, cold what are you man or mouse ?? Riding that orange s&*tbox has made you soft !

[Author]

Posts