andrew reynolds
Just got it firing!
With clean plugs my lm4 runs fine for a few minutes and then starts to misfire. Upon removal of the plugs into find them heavily sorted. Being new to pamper carbs I wonder if my starting technique is at fault?
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Lm4 fouls plug after running for a few minutes.
- Thread starter andrew reynolds
- Start date
Not enough information to go on. Is the bike new to you? Have you had a tune up and carb adjustment? What is your current jetting and are you running the stock air box? We need more information to lead you in the right direction.
With a LM Tonti it's gas on, 2 squirts of the throttle then set at open a touch & start. The 2 squirts is your choke. In cold climate set the choke & flip them down at start. Guzzi puts in #80 choke jet, I swap that out w/idle jet size or a #60. No more black plugs, and you can leave it on more too.
Just to clarify what Steve said, Guzzis don't have a real choke, just enriching jets (the number 80s he was referencing). You do want to get the enriching system off as soon as you can. However, running the bike should clear the plugs. If after a ride they are still black/with soot then you are too rich.
If you are wanting to warm the motor up before leaving on a ride. What I do is set a throttle lock, any kind, just above idle or a fast idle. Then when it slows up you give it a shot of choke to keep it running each time it slows up. That keeps most of the black soot off till it gets warm enough to take the fuel. It's called feathering the choke. I hope I explained it OK.
It helps if your float bowls are clean, the choke jet circuit sucks out of the bottom of them.
It helps if your float bowls are clean, the choke jet circuit sucks out of the bottom of them.
Drumnagorrach
Tuned and Synch'ed
If you could fit a Ducati 916 twistgrip it might help , there is red button on it that when pressed in holds the throttle open enough to keep a cold engine running .
Stevex
Tuned and Synch'ed
Check the (choke) enriching pistons in the carbs. They have rubber blanks on their bottoms which are meant to seal when you flip the 'choke' lever off. The rubbers could be perished, allowing fuel through.
Also check the pistons aren't seized open, partially or otherwise, and also that there is slack in the operating cables, so the pistons fully seat when closed. They're held closed with small springs, worth checking them too.
On my 36mm's I have to flip off the 'choke' lever just after the motor fires, or it bogs down, good idea changing out the jets for smaller ones, must do that next carb strip.
Also check the pistons aren't seized open, partially or otherwise, and also that there is slack in the operating cables, so the pistons fully seat when closed. They're held closed with small springs, worth checking them too.
On my 36mm's I have to flip off the 'choke' lever just after the motor fires, or it bogs down, good idea changing out the jets for smaller ones, must do that next carb strip.