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First start and first experience with VM28’s with accelerator pump
- zed1015
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Stock timing is listed at 40 degrees but 38 is known to work better on these engines.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-
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- Mikaw
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zed1015 wrote: If you had a degree wheel you will find that in many cases the crankcase mark and T mark are not exactly accurate and when in line can be a degree or so out from true TDC..
Stock timing is listed at 40 degrees but 38 is known to work better on these engines.
I checked TDC very crudely with a rubber hose in #4 cylinder, firstly because I swapped out the advancer plate and wanted to check it. I know it was very crud but at piston TDC the crankcase mark did line up with the “T” line on the advancer plate. I changed out the advancer because last fall I didn’t think it was the correct one. I could not get timing retarded to the F mark without the engine stalling. If I turned up the idle to stave off the stall, that then moved the timing F mark (the perfect chase you tail scenario) and I just couldn’t get things correct. Also the breaker plate was all the way to the ends of the adjustment slots. I found what I thought was the correct advancer and installed and was able to get timing to the F mark and below.
Sorry for the long description, just want you to know what has been done. Now the breaker plate is in the middle of its adjustment and bike runs well. Please excuse me but 40deg is advanced correct. As in 40 degrees Before TDC. So is 38deg more or less advanced?
When I set as shown in the second picture it helped response from a standing start. Cracking the throttle at idle before I reset, it would bogg and actually would stall if I didn’t release throttle. Advanced to the stamped F as in second picture helped. Still a bogg or delay in rpm climbing when doing a quick WOT at idle.
Am I closer to 38deg with the second setting? Going the right direction? Can I advance more testing by the seat of my pants or don’t you suggest that.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- Scirocco
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My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- zed1015
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I wouldn't advance any further than stock 40.
Apart from my supercharged , twin plugged motor at 32 degs and the race turbo at 27 degs all my carb'd engines run 38 degrees and are perfect.
With pods or open carbs you are always going to bog the motor to some extent when cracking the throttle open and surprising it with tons of WOT air at a stand still , the fuel just can't keep up with the sudden increase of air volume and increase in venturi pressure , especially with no load and worse if done cold even with accel pumps.
It will be a different matter when actually riding under load on the road and any slight bogging, if any, off tick over should be taken care of by a slight tweak of the pilot mix screws.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-
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- Mikaw
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Zed1015, as always a great source if information and greatly appreciated. I completely understand the rush of air concept. Makes sense.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- Mikaw
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1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- hardrockminer
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I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- Mikaw
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hardrockminer wrote: They knew you were special!
Yes I’ve had a few rides on the short bus , but that’s a story for another day. Are you saying Partzilla was the driver on one of those trips?
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- Scirocco
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If you are in hurry to get shims talk to your local BMW dealer. Some BMW Bikes use the same 29 mm OD and thickness shim size.
www.tills.de/product-320.html
New Shims OEM Quality direct from plant 29mm
BMW
•E169 (F 650, F 650 ST) (09/1993 — 04/2003)
•R13 (F 650 GS, GS Dakar) (02/1999 — 11/2003)
•K14 (F 650 CS) (11/2000 — 09/2003)
•K589 (K100, RS, RT, LT) (05/1982 — 10/1991)
•K569 (K 75, K 75 c, K 75 s, K 75 RT) (12/1984 — 06/2005)
Aprillia:
Aprilia Moto 650
Aprilia Pegaso 650
Aprilia Pegaso 650 Garda
and some Japanese Bikes:
Honda:
CB750C Custom - 1980-1982
CB750F Super Sport - 1979-1982
CB750K - 1979-1982
CB750L LTD - 1979
CB750SC Nighthawk - 1982-1983
CB900C Custom - 1980-1982
CB900F Super Sport - 1981-1982
CB1000C Custom - 1983
CB1100F Super Sport - 1983
CBX1047cc - 1979-1982
Yamaha:
SRX250T/TC - 1987
XVZ12TK/TDK Venture & Venture Royal - 1983
XVZ12DL/DKC2/DN Venture Royal - 1984-1985
XVZ13DS/DT Venture Royal - 1986-1987
XVZ13DSC/DTC Venture Royal - 1986-1987
XVZ12T/TC/U/UC Venture - 1987-1988
XVZ13DU/DUC/DW/DWC Venture Royal - 1988-1989
XVZ13DA/DAC/DB/DBC Venture Royal - 1990-1991
XVZ13DD/DDC/DE/DEC Venture Royal - 1992-1993
VMX12N/NC/S/SC V-Max - 1985-1986
VMX12U/UC/W/WC/A/AC/B/BC/D/DC/E/EC V-Max - 1988-1993
FJ1100L/LC/N/NC - 1984-1985
FJ1200S/SC/T/TC - 1986-1987
FJ1200W/WC/A/AC/B/BC/D/DC - 1989-1992
FJ1200AD/ADC/AE/AEC (ABS) - 1992-1993
FJ 600
FZ 600
XJ 550
XJ 650
XJ 750
XS 400
XS 750
XS 850
XS 1100
YX 600
Kawasaki:
KL 600
KL 650
KLX 650
KZ 900
KZ 1000
KZ 1100
KZ 1300
ZN 1300
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- hardrockminer
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I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- Rick H.
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Rick H.
Rick H.
1977 Kawasaki KZ-1000A1
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- Mikaw
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1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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