Going to be syncing the carbs on the bike.
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  1. #1
    Member Thesharkmonkey's Avatar
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    Going to be syncing the carbs on the bike.

    Hello,
    Need some help with which way to adjust the sync screw. It's been a while since I have had this bike running. I can get it started but the right side header is cool to the touch compared to the left side. This is after letting the bike run for about 30 seconds. I figure the carbs are way out of synch after I cleaned them.

    So do I turn the adjuster screw counter clockwise or clockwise to get started? I am going to put a synchronizer tool on it as well. It hasn't come in the mail yet though. FYI: this has new plugs and valves adjusted.
    -Mark
    Mark A Stover

    1980 Honda CM400T
    1994 Honda Magna VF750C (my newest ride)
    1983 Kawasaki KZ750K1 (twin) (sold)

  2. #2
    Supporting Member jd50i's Avatar
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    Carb sync won't help, cold cylinder is not firing, you need to fix that before syncing.
    Jim

    1973 CB 450 K6 PAMCO
    1975 CB 500T PAMCO
    1985 CB650SC Nighthawk
    1985 VF 1100S Sabre
    2012 Buddy 125 (wifes)

  3. #3
    Super Moderator longdistancerider's Avatar
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    It's not a question of turning right or left per se. Once it's running with the gauges/manometer connected you'll turn one way or the other to get both sides reading identical, close doesn't count. The hard part is loosening the 8mm lock nut and finding a position to insert a long thin screwdriver in to make adjustments. Then being able to hold the adjustment while tightening the lock nut.
    Once it's all tightened back up you have to check that it didn't change, tightening the nut will change it most of the time slightly.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 nuts and bolts restore in progress


    https://www.hondatwins.net/forums/22...d-attempt.html and https://www.hondatwins.net/forums/1-...r-attempt.html
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  5. #4
    Member Thesharkmonkey's Avatar
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    Thanks for the replies. I’m pretty sure I have spark. I had some smoke and popping out of both pipes during the short time it was running. And I tested for spark on both sides a couple months ago.
    Mark A Stover

    1980 Honda CM400T
    1994 Honda Magna VF750C (my newest ride)
    1983 Kawasaki KZ750K1 (twin) (sold)

  6. #5
    Supporting Member jd50i's Avatar
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    a light spray of starting fluid in the right side carb intake will let you know if it is a fuel or ignition problem. If it fires off with the starting fluid it is a fuel problem.

    Lots of threads on here about "thoroughly" cleaned carbs that end up with carbs not being fully cleaned. Completely clogged passages won't allow the cleaning fluid to flow through and clean them so they remain clogged even when using an ultrasonic cleaner, you need to make sure canned air or spray cleaner can get through all passages. Do not use a wire material that is harder than your carb body or it will damage your passages.
    Jim

    1973 CB 450 K6 PAMCO
    1975 CB 500T PAMCO
    1985 CB650SC Nighthawk
    1985 VF 1100S Sabre
    2012 Buddy 125 (wifes)

  7. #6
    Member Thesharkmonkey's Avatar
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    I was able to spray cleaning fluid through all the passages. I was going to disassemble them again over the winter anyway. I just think the carbs are way out of sync but I'm no expert. It runs, it's just rough.
    Mark A Stover

    1980 Honda CM400T
    1994 Honda Magna VF750C (my newest ride)
    1983 Kawasaki KZ750K1 (twin) (sold)

  8. #7
    Supporting Member jd50i's Avatar
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    out of adjustment would cause rough running, not out of sync.
    Jim

    1973 CB 450 K6 PAMCO
    1975 CB 500T PAMCO
    1985 CB650SC Nighthawk
    1985 VF 1100S Sabre
    2012 Buddy 125 (wifes)

  9. #8
    Super Moderator longdistancerider's Avatar
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    I'll suggest you check the ignition system properly to make sure it's good https://www.hondatwins.net/forums/64...78-1986-a.html
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 nuts and bolts restore in progress


    https://www.hondatwins.net/forums/22...d-attempt.html and https://www.hondatwins.net/forums/1-...r-attempt.html
    Road Trip https://www.hondatwins.net/forums/11...here-i-go.html or "where's Jim now?"
    Member Map https://www.hondatwins.net/forums/dcMembermap.php

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