Hello Everyone. If anyone can help compare tips and service issues for a 2008 Suzuki Boulevard M50 (2005 - 2009 VZ800), that would be great. I recently bought mine used with 20,000 miles. Maybe you have experienced something and can share your experiences?
1. Secondary coil resistance was not equal between the front and rear cylinders. I saw some corrosion inside coil 2, at the spring. I decided to replace the whole coil assembly, coil 1 and coil 2. The rear secondary coil 2 was 30k ohms, and the front was 50k ohms. The primary coils were equal at 3.5 ohms. (The service manual calls for Primary resistance of 2.5 to 4.0 ohms, and secondary resistance of 24k - 36k ohms) - so I'm out of spec on secondary coil on the front cylinder. I've ordered OEM replacements. I'm replacing all four. Have you tried lower resistance aftermarket coils on the 805cc engine? Do you have good performance? I will update my results when I get the new coils.
2. Maybe it's related to point 1, but I have pretty high vibration at high RPM, making it hard to drive highway speeds, or anything over 60-65mph for any length of time. When I pull the clutch in, at highway speeds, the RPM reduces, and the vibration disappears, or at least feels normal then. So it should be something like: engine (valves), or spark timing, or fuel/air related (bolts all seem tight), ECU/sensors. Next I'll move on to doing a compression test, and vacuum test of the intake manifold, and fuel pressure test. After that might be a carb synchronization test - but is that still done with fuel injection? Do you have any results for any of these tests I can compare to? Service technique recommendations?
3. For the test, the battery was at 12.7 vdc, a little low in my opinion...I think that should be up around 13.5 - 15.0 vdc, according to the manual. So I'll check the peak voltage and determine if I need a new stator or battery.
4. I took the voltage/resistance/diode readings from the electrical/charging system (stator and reg/rect), except for peak voltage - i'll check peak next week when I have a capacitance meter built up... Everything was normal, but not very high above the bottom of the tolerances... see below... (Instead of having the suzuki meter, you can use two meters and clamp the probes from meter 2 to meter 1 probes.... HOW: Have the main probes on meter 1 for testing/probing, set on diode mode (confirm 1.4 volts or higher with meter 2 by measuring meter 1 probes with meter 2 probes - leave them clamped to meter 1 probes), then set the second meter attached to the first meter to VDC. - now you can see the supply of 1.5v on diode on the second meter. - as you test with meter 1, the votage will drop on meter 2, this is what you are reading to compare to the suzuki specs in the manual.)
A. The reg/rect readings were as follows, with a diode test (which gives a 1.5vdc supply):
B. Wire B/R1 to (B1, B2, and B3): all three black wires of the reg/rect at .459 vdc to 0.461 vdc where the toleraces were 0.4vdc to 0.7vdc.
C. Wire B/R2 to (B1, B2, and B3): all three black wires of the reg/rect at .459 vdc to 0.461 vdc where the toleraces were 0.4vdc to 0.7vdc.
D. Wires B1, B2, B3 to (B/W1 and B/W2): all showed between 0.459 vdc to 0.461 vdc where the toleraces were 0.4vdc to 0.7vdc..
E. Wires B/R1 to (B/W1 and B/W2): 0.76 vdc where the tolerance was 0.5 vdc to 1.5 vdc.
F. Wires B/R2 to (B/W1 and B/W2): 0.76 vdc where the tolererance was 0.5 vdc to 1.5 vdc.
Stator readings: Y1, Y2, and Y3 to ground were all resistance of 0.4 ohms where 0.2 - 1.5 ohms is the tolerance.
QUESTIONS: From what I understand, failing/worn stator and reg/rec will typically short or show lower readings. Have you seen this? Do you have numbers higher than this? If you replaced the stator or rec/reg with OEM new, what numbers did you read?
Thank you for you patience and taking the time to read all this - if you can answer partially, that is fine. Any sharing could mean something, so I appreciate it. Patrick.