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tedd1

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Posts posted by tedd1

  1. No, there is nothing wrong with that much oil. However, if it was tuned/jetted for less oil ratio, adding oil will lean the fuel mixture out, increasing chances of detonation.

     

    +5 timing normally would be OK. Advancing timing will usually make it run better. But, more timing also increases chances of detonation.

     

    I stated before that 18cc domes are to small for pump gas, especially on a 4mil stroker. You should do a compression test to be sure. High compression and too low of octane fuel increase chances of detonation.

     

    Anytime you build a motor, you should do a compression test, check squish, and do a leak down test before running it. After all this and getting it running, do a plug chop or two until you are sure everything is good. If you buy a motor or bike already running, it would be wise to do the same thing. A little investment of time will save $$ in the long run.

  2. I was running 93 pump octane and a full quart of lucas oil mix with 5 gal. It ran super like it never ran before. I kept beating my buddys 4 mil and his brothers cub. But i lost compression in one cyl yesterday pulled my carb and reeds off and found some bits of piston from the right side. And when I took the cool head off found out it chipped a piece of piston. ;'(

     

     

    Detonation...

    18cc domes probably need race gas (as you were previously told). 18cc domes on a 4 mil is getting close to alky range. Did you ever run a compression test?

    1 quart to 5 gal = 20:1, if it was jetted for less oil, it was lean on fuel as well.

    What was your ignition timing? +4 or more?

  3. can someone please explain what the difference between the cheetah cub and serval? i understand that one is for dune and one is for straight drag but are they the same cylinders do they just do more work to them to make it a cheetah? I dont wanna spend all this money and then get it together and be like yeah its a little faster i wanna get off the thing and be like WOW...

     

    Cubs and Servals are both from the Cheetah family of cylinders from CP Industries, Inc.. A true Cheetah will have power valves but Cubs and Servals do not. Cheetahs also run bigger reeds.

     

    A Cub cylinder is set up and intended for mostly wide open throttle, high RPM horsepower. As in drag racing. I wont say it cant be duned or trail ridden. Lets just not go there now.

    A Serval Is set up and intended for a wider, more useable power band. They will make good horsepower from mid to high rpm.

     

    IMHO, I would say that if you intend to do anything with your bike besides wide open dunes, a Serval is the ticket.

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