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carb sync.

  • Thread starter Thread starter terrylee
  • Start date Start date
T

terrylee

Guest
Just did my first carb. sync. with my new Morgan tool. I couldn't get 24.5 cm Hg on the 3rd carb. as Wringer suggest in his write up. He indicated that this could me your carb. is running rich. Did highest rpm on air screws awhile back and pulled plugs today and two nice tan (3rd cyl. for one) and other two were slightly alittle darker. I could get all four carbs. very close to each other on tool, but much lower cm HG, around 18-20. I have stock airbox(well sealed with foam) and Mac 4-2 exhaust (with no cross over pipe). So are these numbers ok and should I have all four the same, or outside two a little lower? terrylee :confused:
 
As long as they are consistent across all 4 gauges you should be fine.

How does the bike run?
 
#2 Today, 05:03 PM almarconi As long as they are consistent across all 4 gauges you should be fine.
Click to expand...

+ 1, since you do not have the crossover 4 even readings is the way to go.
 
FWIW, I didn't write that particular guide -- I just host it. The author is listed at the top.

Personally, I wouldn't have included the reference to a specific level of vacuum. There's no need to worry about that, and it distracts from what you're trying to do. It's useful as a ballpark number only.

With that said, if the vacuum reading you're getting is WAAAAAAYYYYY off, then yes, it could indicate a problem. But you would have many other indications of the problem long before you bothered to hook up a sync gauge.
 
Hi,

Did you try syncing the carbs with the engine idling about 2000rpm or so?


Thank you for your indulgence,

BassCliff
 
Sorry Brian didn't notice that about the article. Sync. them at 1200 rpm as in write up. Bike does seem to start quicker and takes off from a stop faster. But I was hoping for more power in fifth when "getting on it". Although it is better. Maybe I might need to look at my jets? I do love the new sync. tool although it took me a while to get all four to line up, change one, changes another, repeat. I was also hoping the sync. would help with backfiring when you let off throttle, but not really any change. terrylee
 
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