- Posts: 45
- Thank you received: 0
Petcock question
- Pwallace30
- Topic Author
- Offline
- User
Please Log in or Create an account to join the conversation.
- 2 stroker
- Offline
- User
- Posts: 37
- Thank you received: 1
1965 suzuki s32 150 twin
1972 yamaha ls2 100 twin
1980 suzuki gs 550 rat cafe project
1981 kawi 550A1 hooligan bike project
1981 kawi kz 750 ltd
1998 yamaha yzinger
Please Log in or Create an account to join the conversation.
- Pwallace30
- Topic Author
- Offline
- User
- Posts: 45
- Thank you received: 0
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
Which tap coming out of the petcock is for the fuel on my kz650, the bigger one or the smaller one? Also should there be fuel coming from the vacuum tap when the petcock is turned to prime? Thanks
My understanding - - -
The larger petcock nipple is for fuel leaving the petcock which flows through the fuel line to the carb fuel intake.
The smaller petcock nipple is for vacuum supplied through a tube from the carb, which vacuum operates the diaphram inside the petcock. The vacuum tube is not supposed to have any fuel in it, regardless of the petcock setting position. Carbs take in fuel from the carb floatbowl -- not from the carb vacuum nipples.
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- Pwallace30
- Topic Author
- Offline
- User
- Posts: 45
- Thank you received: 0
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
The vent hoses should be clear and routed to open air, usually around the swingarm to exit underneath the bike OR routed to underneath the seat.
The other vacuum nipples (usually four of them) are found on the carb holders OR on the carb bodies, and are supposed to be capped with rubber caps (when not being used to sync the carbs).
[Click on image for slightly larger view]
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- Pwallace30
- Topic Author
- Offline
- User
- Posts: 45
- Thank you received: 0
Please Log in or Create an account to join the conversation.
- 2 stroker
- Offline
- User
- Posts: 37
- Thank you received: 1
on my 550 big one is feed small one is vacuum,and yes prime will dump fuel to carbs
meant to say prime will dump fuel to carbs thru fuel line not vacuum:blush:
1965 suzuki s32 150 twin
1972 yamaha ls2 100 twin
1980 suzuki gs 550 rat cafe project
1981 kawi 550A1 hooligan bike project
1981 kawi kz 750 ltd
1998 yamaha yzinger
Please Log in or Create an account to join the conversation.
- Pwallace30
- Topic Author
- Offline
- User
- Posts: 45
- Thank you received: 0
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
How long should my fuel line be (I have an inline fuel filter that is about 2" end of niple to end of niple)? Im having trouble running my fuel line without it getting pinched once I set the gas tank down in its place.
Length of the fuel line is not critical.
I use the small cone-shaped in-line filters from Z1E.
Would replace fuel hose with the best new line available in a supposedly "non-kinkable" type. Perhaps to be found in a bike repair shop or local tool rental agency.
For me, the automotive style is usually too heavy-duty, thick and bulky for motorcycle application.
Most of the inexpensive clear plastic line will harden after a short time, believed as a reaction from contact with the fuel. Have not yet discovered any clear line that won't eventually harden.
Imo, Tygon is the better clear fuel line, but will never-the-less harden over time.
I now use a relatively expensive "grey line" obtained from a local tool rental agency which uses it in maintenance of their motorized rental items and also in a sideline motorcycle repair business. It is touted as "kink resistant" and actually works very well and has lasted a long time and remains flexible.
Old hard lines will often kink, crack and leak, and should be replaced.
Would exercise some planning and ingenuity in routing the new lines so that gental loops are used to avoid kinking.
Imo is best to design the routing and affix the new line while the fuel tank is already mounted in place on the bike.
There's enough room under there behind the carbs to do it, even on a KZ900 with dual fuel lines from the petcock to the carbs plus the normal dual floatbowl vent lines, crankcase vent hose, and four floatbowl overflow lines, and even the dual oil cooler lines (heavy-duty style).
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- coppertales
- Offline
- User
- Posts: 321
- Thank you received: 0
1982 KZ1100 A2
1982 1100 SPECTRE
1982 1100 SPECTRE
Please Log in or Create an account to join the conversation.
- Pwallace30
- Topic Author
- Offline
- User
- Posts: 45
- Thank you received: 0
Please Log in or Create an account to join the conversation.