'00 M750 running rough

bdfinally · March 31, 2010, 03:38:08 AM

Got on the bike going to work yesterday and about 2 miles later the bike is running like it's out of gas. Pull over and the thing about dies. plenty of gas sloshing around in the tank, so I check the plugs to see if they're fouled. Not pretty but ok. Crank it up runs ok, pull off and it wants to die. Hit the choke and head back to home to grab the car. rough running and wants to die at any light. Anyway get it home and grabbed the car. Come home, change both plugs, check all connections on the coils because I had a lead loose on one a couple of weeks ago, when I finally pulled the pods off and installed a TPO kit. It cranks and idles fine now, but once I get into second gear it starts spitting and sputtering. It sat out in a very heavy heavy rain we got the other day and I added fresh gas yesterday evening. It ran fine on Sunday when I took it out after finally completing the front forks, but before the rain. Any thoughts on where I might start? thanks in advance.

ducpainter · March 31, 2010, 03:43:49 AM

It sounds like water in the fuel.

I'd drain the bowls and add a small amount of drygas or a product recommended to rejuvenate ethanol fuel. Remember if you add much drygas you'll be increasing the alcohol content of the fuel.

MongoReturns · April 01, 2010, 05:37:23 AM

You also may want to rebuild your fuel pump, if you haven't already. Mine recently kicked the bucket. Sympoms were starts for a bit then stalls out. It started due to gavity putting a little fuel in the carb.

bdfinally · April 01, 2010, 07:43:32 PM

Kewl, thanks guys. I think I'm also going to throw a new fuel filter on it for S&G's. Anyone got a part number other than "3047" for the Autozone replacement, that number doesn't seem to be any good thru their online search. DP have you got a specific product you're happy with or just any drygas product? Also if this doesn't work out, any FHE with the Mikuni fuel pump Chris is selling at CA-Cycleworks?

koko64 · April 01, 2010, 09:26:27 PM

Quote from: bdfinally on April 01, 2010, 07:43:32 PM
Kewl, thanks guys. I think I'm also going to throw a new fuel filter on it for S&G's. Anyone got a part number other than "3047" for the Autozone replacement, that number doesn't seem to be any good thru their online search. DP have you got a specific product you're happy with or just any drygas product? Also if this doesn't work out, any FHE with the Mikuni fuel pump Chris is selling at CA-Cycleworks?

For the price of a rebuild kit I would buy the Mikuni pump at Cal Cycleworks before I rebuilt the stocker.

ducpainter · April 02, 2010, 02:13:56 AM

I'm using startron right now.

But that is more for storage...in place of Stabil. You can use a small amount of any type drygas.

I'd take things one step at a time rather than doing a wholesale rebuild of the fuel system.

That way if things go sour you'll know where you are.

MongoReturns · April 02, 2010, 06:47:20 AM

Quote from: koko64 on April 01, 2010, 09:26:27 PM
For the price of a rebuild kit I would buy the Mikuni pump at Cal Cycleworks before I rebuilt the stocker.

Yes, only $10 difference between rebuild kit & a new square Mikuni pump. But I'm fond of the old pentagon, don't know why. However, if you haven't had it replaced or rebuilt, it's going to go soon.

As for the filter, make sure you get one with a 90 degree bend in the output tube. I got one at I think Autozone without a bend, and it's a rear pain in the ass.

bdfinally · April 04, 2010, 03:44:16 PM

OK, threw some Stabil in the other night and drained the bowls today and no improvement. Picked up a new fuel filter at Advance Auto (Puralator F20005) today so I'll try that tomorrow. The hose clamps on fuel lines to the filter are something I've never dealt with, they look almost crimped together...how do you loosen them? I've also got a line on a rebuild kit that's only a day away by UPS, so I guess I'll try that after the filter. Any other suggestions? Thanks in advance, guys.

ducpainter · April 04, 2010, 04:01:04 PM

Stabil won't rejuvenate old fuel to the best of my knowledge.

MongoReturns · April 04, 2010, 04:07:32 PM

Ha! Those clips are a pain in the ass. You need to compress them then stick a little screwdriver under the latching part to un-clip it. At least they're re-usable. To put back on, just compress the thing together again and it'll catch.

I use needle nose pliers on the raised parts, then stick a little flathead in to gently pry the locking part up.

bdfinally · April 04, 2010, 04:10:18 PM

It's not old fuel, less than 2 weeks on this tank. I thought SB removed water from fuel?

ducpainter · April 04, 2010, 04:25:04 PM

Quote from: bdfinally on April 04, 2010, 04:10:18 PM
It's not old fuel, less than 2 weeks on this tank. I thought SB removed water from fuel?

Yeah...rain...I remember now.

I guess they claim it does. I've never used it for that.

Did you see water in the fuel you drained from the bowls?

bdfinally · April 04, 2010, 04:34:14 PM

I just picked it up while I was pricing water heaters the other day

. I did pick up some seafoam today since it was on sale...would that work better?

bdfinally · April 04, 2010, 04:35:54 PM

Quote from: MongoReturns on April 04, 2010, 04:07:32 PM
Ha! Those clips are a pain in the ass. You need to compress them then stick a little screwdriver under the latching part to un-clip it. At least they're re-usable. To put back on, just compress the thing together again and it'll catch.

I use needle nose pliers on the raised parts, then stick a little flathead in to gently pry the locking part up.

Thanks mongo, I'll pull the needlenose and third hand outta the toolbox and give it a shot.

junior varsity · April 04, 2010, 04:45:17 PM

seafoam should work pretty good.

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'00 M750 running rough