katit
Just got it firing!
Spent some time this weekend messing with a bike and trying to get it running properly.
PO claimed it had "carb issue". What it was - it would run mainly on right carb. Those are Dellorto's VHB 30 carbs.
What is not stock about the bike:
a. 950cc cylinders
b. Dyna ignition
c. Some aftermarket coils
d. K&N filters
e. Exhaust
I did verify/adjust valves
I did check compression (pretty much equal slightly below 150psi measured cold)
When checking spark I noticed left plug was sparking on a side, incorrectly, barely. Spark plugs were wrong. New spark plugs spark correctly.
Then I went about carbs rebuild:
New larger mains (130 instead of 120)
New floats and needles
New main needles and needle jets. Needles were incorrect V5, installed new V9
New adjuster screws (per Guzziology)
New #60 slides (per Guzziology). MORE ON THIS LATER
Flipped choke rubbers, verified they seal correctly
Floats (one specifically) was sticking to float cover, had to shave off some plastic moulding to make it move correctly.
Float levels adjusted. Float needle sealing verified.
Once all that was done I went for test rides. Default carb adjustor settings, adjusted throttles to idle.
Ride #1. Running on both cylinders, but not "nice" Feels sluggish on take-off, 1/4-1/2 throttle. But runs and rides. Just doesn't feel right.
Went about adjusting carbs per manual (similar how airheads done). Right carb was good on screw adjustment as-is. Left one - I had to turn needle in full turn (lean) to make it run best.
When adjusting for running on one cylinder (per manual) - need to lift left slide more to make it run. When adjusting using TwinMax - it's different and once adjusted it wouldn't idle just on left. But left cylinder does run once right one helping.
Ignition timing verified using timing light. Good.
Ride #2. Runs crappy. Popping from a carb (I think).
Reset left to correct default needle setting.
Ride #3. Running, no popping but it doesn't run correctly in 1/4-1/2 throttle.
Replaced slides with stock #40s
Ride #4. Runs and rides great for the most part! So, #60 slides were waste of money
Spent some time riding, liking this Guzzi more
Checked spark plugs. Right one - lean. Left one - black, wet inside.
So it is NOT correct
Now my line of thought was why? Carbs good (ultrasonically cleaned, visually verified all passages and blew every hole and ject with carb clean and pressure air)
Maybe bad coil on left side? Anyways..
I decided to swap carbs L<->R and see if problem stays on L side.
Ride #5. Runs about the same. I didn't adjust anything.
After 15 miles or so - R plug is black and L plug is white.
So, it's not timing, not ignition. IT IS carbs. But what?
Any ideas on what to look for? Plug being "white" is not bad, I think slightly bigger pilot jet will fix it. But I need to figure out what the H is wrong with left carb.
My next steps:
1. Get carbs back into correct spots. I will double-check floats move freely (not sticking) and float levels.
2. Run and see if problem persists.
3. Swap choke plungers L/R and see if problem migrates to other side.
4. ? Ordered colortune, want to visually see what is going on, but not sure it will help me any if I will have all the basics checked..
PO claimed it had "carb issue". What it was - it would run mainly on right carb. Those are Dellorto's VHB 30 carbs.
What is not stock about the bike:
a. 950cc cylinders
b. Dyna ignition
c. Some aftermarket coils
d. K&N filters
e. Exhaust
I did verify/adjust valves
I did check compression (pretty much equal slightly below 150psi measured cold)
When checking spark I noticed left plug was sparking on a side, incorrectly, barely. Spark plugs were wrong. New spark plugs spark correctly.
Then I went about carbs rebuild:
New larger mains (130 instead of 120)
New floats and needles
New main needles and needle jets. Needles were incorrect V5, installed new V9
New adjuster screws (per Guzziology)
New #60 slides (per Guzziology). MORE ON THIS LATER
Flipped choke rubbers, verified they seal correctly
Floats (one specifically) was sticking to float cover, had to shave off some plastic moulding to make it move correctly.
Float levels adjusted. Float needle sealing verified.
Once all that was done I went for test rides. Default carb adjustor settings, adjusted throttles to idle.
Ride #1. Running on both cylinders, but not "nice" Feels sluggish on take-off, 1/4-1/2 throttle. But runs and rides. Just doesn't feel right.
Went about adjusting carbs per manual (similar how airheads done). Right carb was good on screw adjustment as-is. Left one - I had to turn needle in full turn (lean) to make it run best.
When adjusting for running on one cylinder (per manual) - need to lift left slide more to make it run. When adjusting using TwinMax - it's different and once adjusted it wouldn't idle just on left. But left cylinder does run once right one helping.
Ignition timing verified using timing light. Good.
Ride #2. Runs crappy. Popping from a carb (I think).
Reset left to correct default needle setting.
Ride #3. Running, no popping but it doesn't run correctly in 1/4-1/2 throttle.
Replaced slides with stock #40s
Ride #4. Runs and rides great for the most part! So, #60 slides were waste of money
Spent some time riding, liking this Guzzi more
Checked spark plugs. Right one - lean. Left one - black, wet inside.
So it is NOT correct
Now my line of thought was why? Carbs good (ultrasonically cleaned, visually verified all passages and blew every hole and ject with carb clean and pressure air)
Maybe bad coil on left side? Anyways..
I decided to swap carbs L<->R and see if problem stays on L side.
Ride #5. Runs about the same. I didn't adjust anything.
After 15 miles or so - R plug is black and L plug is white.
So, it's not timing, not ignition. IT IS carbs. But what?
Any ideas on what to look for? Plug being "white" is not bad, I think slightly bigger pilot jet will fix it. But I need to figure out what the H is wrong with left carb.
My next steps:
1. Get carbs back into correct spots. I will double-check floats move freely (not sticking) and float levels.
2. Run and see if problem persists.
3. Swap choke plungers L/R and see if problem migrates to other side.
4. ? Ordered colortune, want to visually see what is going on, but not sure it will help me any if I will have all the basics checked..