Bike just shut off while riding....

[focus frenzy]

Hey FOCUS I thought the "FIRST GENERATION GS" were the ones with only one fuse controlling everything. ha ha

well it depends on if it is a early or a late first generation, my 80 1000G is a late first generation, but is the first generation of the full liter shafty and it originaly had 5 glass tube fuses, most GS from 82 on have flat blade type fuse/s.

[Suzuki_Don]

Yeah I think my single fuse is about due for an upgrade. So blade type fuses here I come. Just got to find a decent fuse block to mount them in.

[Zooks]

Yeah I think my single fuse is about due for an upgrade. So blade type fuses here I come. Just got to find a decent fuse block to mount them in.

Talk to your local friendly auto electrician Don. They have catalogues with pics of all the possibilities.

[Gargoyle081]

Well I got a little time tonight after work to tinker.I started the bike and let it warm up and started checking things over. Initially tried to move the bike away from the garage in gear after it was warm and it shut off twice on me....

Once I started looking it over and looking for loose connections I couldnt duplicate the "shut off"...I did however find that the breather hose going from the airbox to the top rear of the valve cover had popped off at the valve cover because the spring clamp is shot.

Oddly enough after I secured the breather hose I was able to take the bike around my neighborhood for about 20 minutes and it didnt shut off on me.

I didnt think that was related to the problem but Im certainly up for suggestions.....I guess tomorrow is another day

[duaneage]

Ah, the crankcase vent tube. That does need to be connected. I had a Honda that would not ever start if that was unhooked. It was a little too short and popped off a lot.

[Gargoyle081]

What exactly causes the bike to shut up when this hose pops off? I was under the impression that its just a vent tube...please help me understand a little better what happens

[duaneage]

The vent tube pulls blow by gases from the engine. The seals in the motor form a somewhat restrictive maze so that a vacuum develops on the hose when the engine is running. Pull the hose and the large 1/2 inch hole in the airbox causes the diaphragms in the carbs to drop. These carbs are sensitive to vacuum and airflow across them. They are designed and tuned with a certain amount of restriction from filters and all. Take the air filter out and most won't start or run right at all.

This is why pod filters required different needles, jets, and position settings.

Your looking at a very small, high reving motor with aggressive cam timing, free flowing exhaust, and carbs that are designed to handle very high frequency air pulses. Aint it grand?

[Gargoyle081]

Thank you very much ! Good explanation...Im somewhat aware of the way the carbs worked because I had to take them apart to clean them etc....even then they had to be gone over by someone more experienced. However I wasnt aware that the carbs would be affected by the vent tube, because of its location. Gotta love GSR and you good folks here for putting up with us newbies

[duaneage]

I'm planning on making monthly trips out west from Wilmington Delaware, if you would like to join us for a full day in the country let me know. We should start up next month if the weather warms up a bit.

[Gargoyle081]

Thats an awesome idea...Im actually very interested.Thank you for the offer. Let me know when your making plans and we can set something up

[chef1366]

I don't think it's related. The problem will resurface.

[Gargoyle081]

ahhhh...Chef, my man....why do you say such things??? What else do you think I should be looking for?

[chef1366]

I think it's either the petcock, bad ignitor or connection somewhere.
I just don't think a vent line not connected will cause a stall and no start.

[Gargoyle081]

Well...Chef you were right. I havent been able to ride all week and last night I got a chance to and the problem is back....


Warmed the bike up for a good 10 mins, hopped on and pulled the sidestand up....pushed the bike forward with my feet about 5 inches and she stalled....weird or what?

Started her right back up and decided to take a spin around the neighborhood anyways to see if I could make it do it again and under what conditions it would happen. At every stop I came to, it was 50/50 if it would stall or not. Never happens while Im higher than about 2000 RPMs, and always when I pull in the clutch to downshift, and brake to a stop. The bike will restart without toying with the petcock. I can hit the button and give the throttle a twist and she starts right up but sometimes it tries to drop right off......now Im definitely thinking its a fuel issue. When I notice it trying to die if I can keep it running with the throttle but the RPMS will drop off immediately if I stop