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Old 10-31-2009, 05:01 PM   #556
kta
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Quote:
Originally Posted by OzRoundin'
just as a concluding thought, could me accidentally leaving the choke leaver on for a day plus leaving both petcocks (acerbis) on be the culprit for the current carb problem?

Thanks guys.

And any carb cleaning guide / link would be helpful.
No, the problem is unrelated to the choke or petcocks.

The float needle presses against it's seat to cut off fuel flow when the carb bowl is filled with gas. If the needle gets dirty or worn (or the floats start sticking in place) the needle won't press well against the seat, and fuel will keep entering the carb even though it is full. This causes overflow.

Here is a carb cleaning article I wrote a while back. It is for a street bike that was really gunked up bad, but the principles are the same.

Your carb won't be real dirty. Just a quick cleanup - 30 mins is all it should take.

Cheers

kta screwed with this post 11-05-2009 at 11:31 PM
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Old 11-03-2009, 07:48 AM   #557
endocrantz
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You are right about the floats looking like they are upside-down. They will not work so well that way. Most carbs have the floats the other way around, so your uncle was only kinda wrong.

I can change the jets/clean the bowl/check the floats on my dual-carbs on the bike, it doesn't take long. Needle adjustments are another story though. Do you know what size jets you have installed? I don't think opening the airbox up has much return on investment. I'd rather play the jet game until you feel/see it is right.

Quote:
Originally Posted by Zombie_Stomp
Once I put the float on upside down because the contours of the underside of the carb seemed to imply this position. My uncle insisted I had it right and omething else was probably wrong, but I put it the other way and it functioned properly again. This was on my cross country trip where the bike kept running rich and I cleaned the carb and airfilter a million times. It ended up not being corrected until I did the top end, probably a slightly bent valve or the rings which later ended up having a broken ring land.

Anyway, these are good carbs whether the single or dual, and ffloat problems can be tweky and difficult, but usually sorted out in short order. Good luck.

trying to decide what to do with my current slightly rich mix. Open up the intake somehow, or downjet? Running a stock XL600 airbox, dual carbs, FMF plate style pipe (like supertrapp but oval-shaped) with huge, wide-open FMF header pipe.
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Old 11-03-2009, 08:43 AM   #558
trackhead
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Picked up a 1996 XR600R last month and have put an enjoyable 600 miles on it since. The pig runs great, starts great, and now it's time to tear it down to make sure there are no hidden problems waiting to strand me in the desert.

Piggy on it's last ride.


Blurry pics because my camera got roasted in Moab last weekend.

I've seen pics of torn up cam journals and roasted cylinders, so I stripped Ms. Piggy this morning.

Piston looks good. No funk on the skirt. Never did see Piggy smoking when my brother was riding it, but new rings can't hurt.


Cam journals are smooth to the touch, no scratches or abrasive surfaces. Valves were in spec upon purchase and prior to tear down.


Cam is smooth, bearings feel nice.


Cylinder looks good.


Why I'm doing this, I also took off a bunch of other stuff to rewire the tangled mess the prior owner left, and to paint the frame, clean the carb, etc.


Parts pile.


Fix it or change it list:
1. The bike has a rewound stator, so I'd like to find the lights from the XL600LM bike with the fancy dual lights.
2. Rings/gaskets
3. New wiring harness.
4. Acerbis 6g tank and ditch the Clark 5 gallon.
5. Set up the front suspension to better accomodate the heavy gas tank.
6. New, wider bars and bar riser.

Questions: On my CRF250x when I did piston/rings I "honed" the cylinder with a Scotch Brite pad. Can you do the same with the XR?
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Old 11-03-2009, 10:25 AM   #559
JAB
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How's the cam chain and tensioner look?
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Old 11-03-2009, 10:27 AM   #560
trackhead
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Quote:
Originally Posted by JAB
How's the cam chain and tensioner look?
Both 'look' good.

Wondering about the cylinder. Is this a Nikasil coated cylinder?
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Old 11-03-2009, 10:49 AM   #561
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Quote:
Originally Posted by trackhead
Both 'look' good.

Wondering about the cylinder. Is this a Nikasil coated cylinder?

Nope...Iron

Scotchbrite?? I might try 600 grit wet or dry with some solvent.
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Old 11-03-2009, 11:35 AM   #562
trackhead
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Quote:
Originally Posted by mcma111
Nope...Iron

Scotchbrite?? I might try 600 grit wet or dry with some solvent.
Yeah, I used Scotchbrite with success on my Nikasil coated CRF250x, but this cylinder doesn't have the crosshatch patter. Almost considering just taking it to a reputable machine shop and having it done by a pro.
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Old 11-03-2009, 11:43 AM   #563
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Hone

Quote:
Originally Posted by trackhead
Almost considering just taking it to a reputable machine shop and having it done by a pro.

Well there ya go...
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87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 11-05-2009, 09:17 PM   #564
screwit
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Highway gearing

Got a ride planned and have to ride some slab to get there. What gearing has been successful for you FF's. My bike has 14 x 46 now which is already pretty tall.
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Old 11-05-2009, 11:09 PM   #565
Zombie_Stomp
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Quote:
Originally Posted by screwit
Got a ride planned and have to ride some slab to get there. What gearing has been successful for you FF's. My bike has 14 x 46 now which is already pretty tall.
15/40 got me acro the USA going 75 or long stretches at times. Stock is 15/43, so your 14/46 is not tall at all.
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Old 11-05-2009, 11:37 PM   #566
kta
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Stock gearing on the R is 14/48 I believe. The L models have the 15 tooth front.

I ran stock gearing on my R for 3200 miles over a couple weeks with no issues at all. It was a little short on the highway but I'm a patient kind of guy, so I just cruise in the slow lane and let people zip past if they want. I prefer to have the low gearing off-road.
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Old 11-06-2009, 09:44 AM   #567
Zombie_Stomp
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Quote:
Originally Posted by kta
Stock gearing on the R is 14/48 I believe.
oops, forgot I wasn't in the XL600 thread, they kind of blend together for me. The L has different ratio from crank to tranny gear as well. What the difference is, i don't know, but it is probably slightly taller there too. Gearbox ratios remain the same if I'm not mistaken.
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Old 11-06-2009, 09:50 AM   #568
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The XL600 shares the same primary ratio of 2.188 with the XR600 AFAIK. The 650L's is taller at 2.029. HRC's Power Up kit for the XR600 included a 650L clutch basket and crank gear in order to put less torque multiplication through the transmission.
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Old 11-12-2009, 07:35 PM   #569
DirtandBlood
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Wink Trying to buy an XR600

Just went and looked at a really clean 95 XR600. Pretty much stock. It was really hard to start, and once started and fully warmed up, it ran great on half choke but real sputtery and poppy with choke off and would not idle. While test riding it was the same. Half choke ran great, choke off, it would barely maintain speed. The gas is at least 3 or 4 months old and the owner has only fired it up briefly once or twice in that time span. I'm thinking the problem is crusty gas and a partially clogged jet which is an easy fix.

My question is: Are there any mechanical issues that would give this symptom? It ran great at half choke. Smooth, tons of power (I was almost bucked off while leaned over fiddling with the choke going down the road), everything was tight and felt good. I just don't want to get sucked into another POS motorcycle.
Thanks in advance!!!! :)
I really like this thread and am dying to get a pig of my own.....
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Old 11-12-2009, 08:13 PM   #570
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Sounds like crud or water in the carb. Was it making any bad metallic noises or smoking? Feel like it had compression? Did the rest of the bike look like it was loved? Any oil leaks? Good luck.
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