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General Category >> Rubber Side Down! >> Re: Differentiating Between Petcock / Electrical I
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Message started by bobert_FSO on 05/22/20 at 12:27:22

Title: Re: Differentiating Between Petcock / Electrical I
Post by bobert_FSO on 05/22/20 at 12:27:22

My experience with fuel starvation by petcock was similar. Trying to maintain 65mph against a 20 mph headwind. The bike would act like it was running out of gas. As the bike was slowing down, I flipped to PRIME while still moving and it brought immediate relief.

I determined that I had a stiff petcock diaphragm that would not hold the petcock open during low carb vacuum conditions.

There is no problem at all running with the petcock on PRIME. The only issue is the lack of a fuel reserve, which means you need to really keep track of miles since last fill-up or as you mentioned, carrying a small amount of gasoline in a separate container.

Edit: no need to cap off the vacuum line in this scenario. The vacuum line is not leaking. There is still vacuum there, but just not enough to hold the diaphragm open.

Title: Re: Differentiating Between Petcock / Electrical I
Post by norm92de on 05/22/20 at 12:32:11

I don't think you have done any harm to your bike. Also I see nothing wrong with running on prime as you described. Of course if you run out of fuel on prime. Oh well!

I don't think carrying fuel in a bottle is legal but if you do you will have to carry a fair sized bottle. A quart will only get you maybe 15 miles. I think A couple of oil containers would be ideal. Make a note of your mileage when you fill up.

Title: Re: Differentiating Between Petcock / Electrical I
Post by Gary_in_NJ on 05/22/20 at 17:21:42

I stopped reading when your “ mechanically inclined” friends suggested that the wires flew off due to wind blast.

Don’t ask for their help anymore.

Title: Re: Differentiating Between Petcock / Electrical I
Post by batman on 05/22/20 at 17:57:27

I'm with Gary ,wind blast, No way. But I have had the battery cable screws loosen from vibration, and check the springs on your kickstand ,if their stretched the kickstand could swing out enough to open the switch and that will kill the power to the ignition any time the bike is in gear, most don't consider this but the bike sets with the stand open most of it's life and that's when the springs are most fully extended.

Title: Re: Differentiating Between Petcock / Electrical I
Post by ohiomoto on 05/22/20 at 21:40:18

Say what?

Title: Re: Differentiating Between Petcock / Electrical I
Post by Ruttly on 05/22/20 at 22:58:17

606A6E646F66626B353337070 wrote:

I stopped reading when your “ mechanically inclined” friends suggested that the wires flew off due to wind blast.

Don’t ask for their help anymore.

LMFAO ;D ;D ;D

Title: Re: Differentiating Between Petcock / Electrical I
Post by Dave on 05/23/20 at 10:11:53

Using PRI to get back home is a good plan - but I would not count on it for a permanent fix.

The stiff diaphragm may begin to leak fuel into the vacuum side any day now......and/or maybe start to decompose and flow pieces down the fuel line into the carb.

Now that you know what the problem is, it is time to fix it with a new diaphragm or a Raptor petcock.

Title: Re: Differentiating Between Petcock / Electrical I
Post by justin_o_guy2 on 05/23/20 at 21:11:56

One of the first Maxims we learn as young mechanics is
If ya cant fix it with a hammer
Its electrical..