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VM28SS question
- sbulla
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- 1980 KZ1000 LTD
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23 Nov 2008 07:52 #248975
by sbulla
Now----
1980 KZ1000 LTD (Kerker 4-1, K&N pods, Dyna gray coils)
Gone but not forgotten----
1966 Honda 305 Superhawk
1969 HD 350 Sprint
1971 500 H1
1972 250 F8
1972 750 H2
1973 KX250
1995 HD Sportster 1200
2000 HD Softail
2002 KLR650
VM28SS question was created by sbulla
I'm just curious about something I noticed about the VM28SS carbs on my bike.
If I remember correctly, all the other carbs I've worked on in the past have had o-rings on the air screws (or pilot screws) but, these don't. Just the screw and a spring.
I seem to recall something I read about these carbs in a manual or somewhere else that, after the adjustment was made, the plugs should be re-inserted and sealed over the screw.
Is this a requirement? Would this be a possible air leak point if left uncovered?
Just curious as they were uncovered when I purchased the bike...
Sonny
If I remember correctly, all the other carbs I've worked on in the past have had o-rings on the air screws (or pilot screws) but, these don't. Just the screw and a spring.
I seem to recall something I read about these carbs in a manual or somewhere else that, after the adjustment was made, the plugs should be re-inserted and sealed over the screw.
Is this a requirement? Would this be a possible air leak point if left uncovered?
Just curious as they were uncovered when I purchased the bike...
Sonny
Now----
1980 KZ1000 LTD (Kerker 4-1, K&N pods, Dyna gray coils)
Gone but not forgotten----
1966 Honda 305 Superhawk
1969 HD 350 Sprint
1971 500 H1
1972 250 F8
1972 750 H2
1973 KX250
1995 HD Sportster 1200
2000 HD Softail
2002 KLR650
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- Patton
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- KZr Legend
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23 Nov 2008 08:40 #248981
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic VM28SS question
Side-located pilot air screw has no o-ring and won't leak without the plug (an EPA feature to discourage adjusting).
But would maintain ever vigilant lookout for the EPA plug inspection police to avoid arrest and firing squad.
Good Luck!
But would maintain ever vigilant lookout for the EPA plug inspection police to avoid arrest and firing squad.
Good Luck!
1973 Z1
KZ900 LTD
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- onanysunday
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23 Nov 2008 09:46 #248987
by onanysunday
79 KZ1000 E-1
VM28SS
K&N Pods
Replied by onanysunday on topic VM28SS question
If you suspect an air leak, you can always remove and read the sparkplugs to get a good sense of the air/fuel ratio you are running in each of the cyls. and make the necessary minor adjustments on the pilot screw to dial-in the perfect color for each plug. Good luck. It's probably a non-issue, but read your plugs anyway, it's fun..good luck.
79 KZ1000 E-1
VM28SS
K&N Pods
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- wiredgeorge
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23 Nov 2008 12:32 #249006
by wiredgeorge
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
Replied by wiredgeorge on topic VM28SS question
The pilot screws are air screws and adjust the amount of air going to the pilot circuit at idle. Any adjustments will only affect plug burn/color if you only idle the bike. If you ride it on the street, the mid-range jet needle/needle jet combo and main jet have far more effect on the plug burn.
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
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- sbulla
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23 Nov 2008 12:50 #249011
by sbulla
Now----
1980 KZ1000 LTD (Kerker 4-1, K&N pods, Dyna gray coils)
Gone but not forgotten----
1966 Honda 305 Superhawk
1969 HD 350 Sprint
1971 500 H1
1972 250 F8
1972 750 H2
1973 KX250
1995 HD Sportster 1200
2000 HD Softail
2002 KLR650
Replied by sbulla on topic VM28SS question
wiredgeorge wrote:
YEAH!,...what he said! :laugh:
Anyway, I suspected they were OK to leave open, I just had the thought of that passage I read haunting me and needed y'all to reassure me.
BTW, got the bike all back together now and my throttle hang is cured!
Was probably the advancer cleaning and lube that did it.
Thanks,
Sonny
The pilot screws are air screws and adjust the amount of air going to the pilot circuit at idle. Any adjustments will only affect plug burn/color if you only idle the bike. If you ride it on the street, the mid-range jet needle/needle jet combo and main jet have far more effect on the plug burn.
YEAH!,...what he said! :laugh:
Anyway, I suspected they were OK to leave open, I just had the thought of that passage I read haunting me and needed y'all to reassure me.
BTW, got the bike all back together now and my throttle hang is cured!
Was probably the advancer cleaning and lube that did it.
Thanks,
Sonny
Now----
1980 KZ1000 LTD (Kerker 4-1, K&N pods, Dyna gray coils)
Gone but not forgotten----
1966 Honda 305 Superhawk
1969 HD 350 Sprint
1971 500 H1
1972 250 F8
1972 750 H2
1973 KX250
1995 HD Sportster 1200
2000 HD Softail
2002 KLR650
Please Log in or Create an account to join the conversation.