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Clutch slippage or fuel problem?

Discussion in 'Loop & Tonti' started by Gappy, Jul 5, 2020.

  1. Gappy

    Gappy Tuned and Synch'ed

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    Location:
    StLouis MO USA
    I think my 94 Cali (carbureted ) is in good tune, the plugs are picture text book perfect. After I warm the bike up if I flog it in 4th especially 5th gear,after I have reached 4000rpm the clutch can slip and over rev. Now if I ride it like a sane human, I don’t seem to have that condition.

    Now here is my problem and frustration. After the bike is warmed up, running it through 1st, 2nd and 3rd gears at a an easy acceleration rate up to 35-4000rpm that is its happy spot, the engine is spinning and bike is running smoothly like it had an electric motor My speed is roughly a little over 40 mph. Now when I grab 4th and bring it up to rev, the engine is thumping a little and will not completely smooth out and my speed in crease is about 15-20mph faster, go for 5th gear and bring it up to the happy spot and it is a thumping monster, calms down somewhat and my speed is around 65 mph. I know that it is said that the 5th gear is too tall for this model but the engine is at 35-4000 rpm and should it be running smooth like in 3rd gear? Should the engine be spinning instead of thumping? I hear the carbs sucking hard through the air box in time with the cylinder fire. Not enough air ,too much air, not enough fuel, too much fuel? Or could it be a failing clutch. My mpg is a steady 32.

    Maybe my fly wheel needs to be balanced, I don’t know. Any insight and comments appreciated.
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    The carbed version should be getting better mileage than that. Clutch should never slip unless worn out or oil is on the plates. How many miles on the bike? Do you see any oil leaking from the bell housing? Are the carbs in sync? Is compression even? Many questions to answer based on what you describe.
     
  3. Gappy

    Gappy Tuned and Synch'ed

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    The carbs are synced with twin max and I recheck with vacuum gages while I had the sync tubes on. No leaks and I peaked in the timing cover hole and it looked dry. The carbs were rebuilt last summer and it has been a constant effort to get power and smoothness out of the thing. I am running a 268 atomizer with a 22 needle and 135 main jet. I forget what the pilot is but that don’t matter at high way speeds. When I first got the bike I checked the compression, I don’t remember what it was but I do remember that there was only a few pounds difference not knowing what the compression is supposed to be, thought it ok.The bike has 42k on the clock. I did the sync last fall and figured nothing has changed. Did not ride it that much. Rode it 450mi yesterday and decided that it is still not right. It will easily Cruze at 75mph but not smooth running.

    could the choke rubbers be leaking? Just a thought. I also took off the big crossover box thing and replaced with a crossover tube , but I would not think that would do anything.
     
  4. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Try a 265 or 262 atomizer and K5 or K27 needles. Mains should be 125. These combinations seems to work well on 1100 carb engines. At the bottom of the bell housing there is a small hole, see if any oil is there. At 42 K the clutch shouldn't be worn out unless the adjustment has been incorrect for some time or oil is getting past the gearbox input seal or clutch push rod seals to the clutch assembly. Without seeing the bike, this is difficult to figure out on a forum.
     

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