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Old 10-31-2010, 04:25 PM   #5821
Blacksamwell
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Joined: Jan 2008
Location: Columbia, MO
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BHW, don't get discouraged. Just make sure you've worked through all of the possibilities.

I struggled with the same issue on my bike. I thought for sure I was going to need to replace the float needle and seat when my efforts at setting the float height to 19 mm didn't solve the problem.

So I pulled the carb off one more time in preparation and went to see how bad the condition of the seat was. Well, when I put a light down the hole I could see a blob of some black crud clearly stuck to the side of the seat. In spite of cleaning the carb multiple times during my work, I hadn't ever visually checked that dark hole and I was overlooking a simple fix.

I blasted the crud out with carb cleaner and compressed air, re-verified the float level at 19mm, and FINALLY it stopped pissing gas.

Also... There's a very slim chance that your float might have a small leak and therefore isn't floating the way it should. Check that by pulling it off the carb and shaking it next to your ear. If you hear anything sloshing around inside the float it is bad and should be replaced.

This page has some very nice pictures to go along with the textual instructions.
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Old 10-31-2010, 05:51 PM   #5822
1224R
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Ey guys and gals.... I hardly ever use my choke... What is the OFF position in the choke?? Lever up or lever pointing down??? Can't remember.... I think it is off in the DOWN position... Thanks sincerely, BRP choke Ra-tard...
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Old 10-31-2010, 05:57 PM   #5823
BHW
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Quote:
Originally Posted by Blacksamwell

This page has some very nice pictures to go along with the textual instructions.
Thanks for that link, that's exactly the kind of instructions and pics I need. The float needle/valve I put in was new. But I couldn't figure out where to measure from to get 17-19mm.
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Old 10-31-2010, 05:59 PM   #5824
BHW
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Quote:
Originally Posted by 1224R
Ey guys and gals.... I hardly ever use my choke... What is the OFF position in the choke?? Lever up or lever pointing down??? Can't remember.... I think it is off in the DOWN position... Thanks sincerely, BRP choke Ra-tard...
Pointing at 6:00 is off or no choke

8:00 is partial choke

9:00 is full choke
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Old 10-31-2010, 06:31 PM   #5825
Coastie3202
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Location: Alamogordo, New Mexico
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What size chain?

While tearing down the 05 XR650R I noticed that the chain was a bit too tight. Upon further examination I determined that it is running a chain that is too short. The alignment blocks are over halfway forward and the chain is tight, so not much room to loosen it without it rubbing the shock guard. So I guess I am gonna have to buy a new chain.

What size chain does the stock XR650R run and what is the stock tooth count on the counter and rear sprockets?

Thanks for your help.
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Old 10-31-2010, 06:41 PM   #5826
joenuclear
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Quote:
Originally Posted by Coastie3202
While tearing down the 05 XR650R I noticed that the chain was a bit too tight. Upon further examination I determined that it is running a chain that is too short. The alignment blocks are over halfway forward and the chain is tight, so not much room to loosen it without it rubbing the shock guard. So I guess I am gonna have to buy a new chain.

What size chain does the stock XR650R run and what is the stock tooth count on the counter and rear sprockets?

Thanks for your help.
It is recommended to run the tire as far forward as possible to help the bike turn. That being said I've had to replace two rear shock guards that were eaten by rear tires.
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Old 11-01-2010, 12:11 AM   #5827
KASUYAHO
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Quote:
Originally Posted by Coastie3202
Ah Shit...more work. God what next? Should I repack the headlight while I have everything apart?
You'll have to get a pack of sparks for the battery too.......
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Old 11-01-2010, 04:59 AM   #5828
Coastie3202
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Quote:
Originally Posted by KASUYAHO
You'll have to get a pack of sparks for the battery too.......
See, now your mak'in fun of my skool'n. I am smart enough to know that the sparks ain't got noth'n to do with the battery, they be what hold the tare onto the motorckle, and all my sparks are there and be tight. Besides the XRR ain't got no battry. Hell, even I no that!
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Old 11-01-2010, 11:25 AM   #5829
BHW
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I'm about to give up. I have two options with my carburetor, let it drip gas out hte vent tube any time the petcock is open, or close it off so the bike won't get any gas and run. There doesn't seem to be any middle ground.

I've adjusted the float several times, it's either off or on. At 16-17mm it pours gas out the vent tube. And more nd it shuts off completely.

Tried a new float needle. Same issue. Inside of carb is clean, no gunk or deposits. Everything seems to be working properly except the float.
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Old 11-01-2010, 11:43 AM   #5830
modette
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Old 11-01-2010, 12:16 PM   #5831
peterhively
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Quote:
Originally Posted by BHW
I'm about to give up. I have two options with my carburetor, let it drip gas out hte vent tube any time the petcock is open, or close it off so the bike won't get any gas and run. There doesn't seem to be any middle ground.

I've adjusted the float several times, it's either off or on. At 16-17mm it pours gas out the vent tube. And more nd it shuts off completely.

Tried a new float needle. Same issue. Inside of carb is clean, no gunk or deposits. Everything seems to be working properly except the float.
I know it's frustrating, I went through the same thing when I got my R.

First I would verify that your tank is clean, some folks clean carbs over and over when there is junk in the tank.

I had to set my float at 19mm. before I did that it would leak on the sidestand and blubber and bog going up steep hills. Set like that your bike should be just fine.

It is possible at this point that your float is mangled out of normal alignment, one float lower then the other. I suspected the same when I was struggling with mine, so I just replaced it. New float, new float needle, visually verify the float needle SEAT is clean and in good condition like the guy said above. I have heard of people using a pencil eraser or similar to clean the seat, I think you can even buy a tool to dress the seat.

Also verify the float is not getting hung up on anything, it should be free to go up and down.

Don't give up!
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Old 11-01-2010, 12:21 PM   #5832
peterhively
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Joined: Nov 2006
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Quote:
Originally Posted by Coastie3202
While tearing down the 05 XR650R I noticed that the chain was a bit too tight. Upon further examination I determined that it is running a chain that is too short. The alignment blocks are over halfway forward and the chain is tight, so not much room to loosen it without it rubbing the shock guard. So I guess I am gonna have to buy a new chain.

What size chain does the stock XR650R run and what is the stock tooth count on the counter and rear sprockets?

Thanks for your help.
Stock is 14/48 and 110 links.
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Old 11-01-2010, 01:01 PM   #5833
RideFreak
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Quote:
Originally Posted by BHW
I'm about to give up. I have two options with my carburetor, let it drip gas out hte vent tube any time the petcock is open, or close it off so the bike won't get any gas and run. There doesn't seem to be any middle ground.

I've adjusted the float several times, it's either off or on. At 16-17mm it pours gas out the vent tube. And more nd it shuts off completely.

Tried a new float needle. Same issue. Inside of carb is clean, no gunk or deposits. Everything seems to be working properly except the float.
It's a matter of finesse and careful measuring you want the float assy to swing freely (easily) on the pin, the idea is to adjust the float tang to barely contact the spring loaded end of the float needle. Carefully adjust the tang so there's 18mm (some prefer 19mm) distance, measured from the gasket sealing surface to the bottom of the plastic floats. The carb has to be held at an angle so the floats swing downward from the pin, this is so you can get an accurate reading right where the tang just contacts the pin. Make sure the frame of the float assy isn't bent and contacting anything in the carb when the bowl is installed. Once I assemble a float bowl, I always shake the carb vigorously a couple times up & down just before I install it on the bike. This is to ensure the floats are moving freely in there, you should hear them moving. You can always check the float valve's ability to shut off by putting some liquid (I didn't say gas ) in the fuel line and holding the floats closed. Any screwdriver or plier damage or distortion to those parts usually causes them not to work correctly. Also compare the new and old needle valves, ensure they are the same, don't forget the sealing washer under the needle seat.

You are dealing with one of 3 things:
- the needle & seat is incorrect
- the floats are bent, contacting another part or not floating
- you're getting the procedure wrong.

I'm not saying you jacked it up but I have seen that happen more than once.
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Old 11-01-2010, 01:13 PM   #5834
Ironwood
Friday Harbor, WA
 
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Check valve adjustment.

I take one of the vent tubes and put it on the fuel inlet nipple. I then blow through it while moving the float through it's range of movement. This way I can tell exactly when it is shutting the check valve. It sure seems like you are having an inordinate amount of trouble adjusting it. Try my method and see if it helps.

Joe
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Old 11-01-2010, 03:31 PM   #5835
BHW
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OK.....follow up part 7 or whatever.

Took carb off again....(twice actually). The first attempt resulted in pouring gas as soon as I connected the gas tank and turned on the petcock. The second time I put the original float needle back in. They look identical except for some discoloration on the old one. The spring in each one seems to pop back up normally. I looked over the flaot closely, one side may have been bent up a little higher than the other. I tweaked on them until they looked even. I lined the tang up a few times until it was right at 17mm and everything moved freely. Re-installed everything. Turned on petcock, no drips. Shook bike around a lot, still no drips.

And back to where I was yesterday....no drips, but is ANY fuel getting into the bowl now? Bike still won't crank. So either I've got some other sudden problem or there's no fuel getting into the bowl. I'm still sick as a dog with a flu or some other hideous virus...and only kicked on it for a few minutes. I'm mentally and physically worn out. But I sure get the impression it has ZERO intentions of firing. It ran fine before this carb tinkering began.

I feel like the ultimate dumbass. I guess I'll learn about carbs, the hard way!

I also spent a couple of hours digging holes and then patching a polybutelyne water line leak this evening. I'm getting good at that too. Going to have to dig a well and say to hell with the water company. This is my 3rd big leak in a year, and this water bill will end up costing us about $600...that we don't have. I've had a GREAT day!
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