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Fuel Petcock PRI
- nickleo373
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Thanks
1981 KZ550C LTD
"If you ain't first, you're last"
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- uncle nick
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It doesn't like starting then and I have to use PRI rather than main or reserve.
Hope this doesn't mean I've got problems as well!
1981 KZ650 CSR
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- Powerstroke_fan
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1980 kz1000B4 LTD- 1327cc 9-1 comp
Ported J model head
Psp-3x cams
RS 36s
Welded MK11 crank
Back-cut MK11 trans
MTC 2 stage lock up
Stretched 4-6 over running Hayabusa rear rim with 190 rear tire
Complete frame brace kit installed
And Much Much more- SOLD
2014- ZX14R all stock for now
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- Powerstroke_fan
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uncle nick wrote: Hi, I don't know the exact answer to your problem but my KZ650 is the same if the fuel level is getting low, like about to go on to reserve but still running on main when stopped.
It doesn't like starting then and I have to use PRI rather than main or reserve.
Hope this doesn't mean I've got problems as well!
If iam not mistaken its not like reserve. Prime allows the petcock to be turned on and allow gas to flow with gravity. The other posisitions like on and res require a vaccum to open the petcock.
1980 kz1000B4 LTD- 1327cc 9-1 comp
Ported J model head
Psp-3x cams
RS 36s
Welded MK11 crank
Back-cut MK11 trans
MTC 2 stage lock up
Stretched 4-6 over running Hayabusa rear rim with 190 rear tire
Complete frame brace kit installed
And Much Much more- SOLD
2014- ZX14R all stock for now
Please Log in or Create an account to join the conversation.
- Patton
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Less likely, but conceivable, that there might be a cracked or loose overflow tube which is allowing fuel inside the bowl to escape via the overflow circuit.
Good Fortune!
1973 Z1
KZ900 LTD
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- nickleo373
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1981 KZ550C LTD
"If you ain't first, you're last"
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- Patton
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Perhaps the cylinder for that particular carb isn't performing well enough to generate the necessary vacuum.
Could attach the vac hose to a vac nipple on a different carb, and test run to see whether it makes any difference. Be sure to cap/plug the formerly used vac nipple.
Would fit a new vac hose, or at least carefully inspect the existing vacuum hose which may be ill-fitting at the end(s), or cracked or torn.
If part of the vacuum is escaping before reaching the petcock, there might be enough vacuum being supplied to the petcock at normal running rpm, but not enough vacuum at crank-over.
Similarly, if there's an issue with the petcock diaphragm, the diaphragm may be functioning at normal running rpm, but not receiving enough vacuum to function at crank-over.
Good Fortune!
1973 Z1
KZ900 LTD
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- Patton
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Such leak could be through a drain screw that isn't fully sealing, or past a float bowl gasket.
On some carbs, it's possible to over-tighten the float bowl screws, whereby an ear on the float is slightly bent just enough to disallow a sufficiently close fit between the mating surfaces on each side of the gasket. Seapage past the gasket may then occur regardless of tightness of the screws, when the bike is leaned over resting on the side stand.
The bent ears can usually be restored to their original positions.
Is there any discoloration on exterior of the float bowl(s) to indicate minor fuel leakage from the gasket area?
Good Fortune!
1973 Z1
KZ900 LTD
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- nickleo373
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There is no new gas stains on or under the carbs however
1981 KZ550C LTD
"If you ain't first, you're last"
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- Powerstroke_fan
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1980 kz1000B4 LTD- 1327cc 9-1 comp
Ported J model head
Psp-3x cams
RS 36s
Welded MK11 crank
Back-cut MK11 trans
MTC 2 stage lock up
Stretched 4-6 over running Hayabusa rear rim with 190 rear tire
Complete frame brace kit installed
And Much Much more- SOLD
2014- ZX14R all stock for now
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- slayer61
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- KZR FLAG RELAY CARRIER #62
What he said! I've purchased Yamaha petcocks 3 and 4 at a time finding that they were all crap and leaked right out of the box! :blush:
Don't be ridiculous! It's only a flesh wound!
[strike]Wife's little bike... 1984 GPZ 550 Kerker and DynaJet stage I kit[/strike]
Wife's BIG bike......[strike] 1981 GPZ 1100 Kerker and [strike]factory FI[/strike] Mikuni RS34s W/ K&N pods[/strike] SOLD
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- baldy110
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