Honda VTX 1300 / VTX 1800 Motorcycles Forum banner

1 - 4 of 4 Posts

·
Registered
Joined
·
180 Posts
Discussion Starter #1
Hi everyone,
I haven't been writing for a while but since in Poland is winter I have started winter maintenance. What I noticed today is the difference in the spark plugs. After removal I saw that both spark plugs from rear cylinder are OK but both plugs from front cylinder are showing realy lean working condition:hmm2:. Here are my questions:
What could be the reason or maybe it is normal?
What part of carburetor is responsible for providing mixture for front and rear cylinder?

Bike has 16000 miles, plugs changed at 12000 miles, gaps OK.

Any idea or advice..
thanks
 

·
Registered
Joined
·
706 Posts
This is normal in a V twin. The firing sequence makes the pressure in the intake manifold different fot the front than the rear. Look at the cam durations and you will see they are differenct for the front and the rear. I don't know how your carb is jetted, ours are set up very lean and we have air polution junk as well.
 

·
Registered
Joined
·
875 Posts
From what I understand it has more to do with tempature. Even though the bikes are liquid cooled the the front cylinder gets more airflow for cooling. If its running fine I wouldnt worry too much.
 

·
Registered
Joined
·
1,624 Posts
Hi everyone,
I haven't been writing for a while but since in Poland is winter I have started winter maintenance. What I noticed today is the difference in the spark plugs. After removal I saw that both spark plugs from rear cylinder are OK but both plugs from front cylinder are showing realy lean working condition:hmm2:. Here are my questions:
What could be the reason or maybe it is normal?
What part of carburetor is responsible for providing mixture for front and rear cylinder?

Bike has 16000 miles, plugs changed at 12000 miles, gaps OK.

Any idea or advice..
thanks
The difference from front to rear spark plug conditions is normal. There are a number of carburetor specialists here on this forum who can explain more. Do not worry, it is OK.
Bry
 
1 - 4 of 4 Posts
Top