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Thread: Fa-90

  1. #1
    Team Member BJuby's Avatar
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    Default Fa-90

    Acquired another looper a couple weeks ago. An "A" in excellent shape. I am having pistons made and rings sized and fitted for it. Also, the cage that it came with blew a corner (probably the cause of it being retired) and I am having another one machined to replace it from a Mark 25 cage. I have an NOS Mark 25 crank for it. I will also be getting 16:21 gears for it and likely a thunderbolt style ignition, but the ignition system it came with is pictured below. Also if people could please keep an eye out for an appropriate flywheel for the "A" looper. I have some of the belt driven flywheel hubs (which I will need for thunderbolt ignition), but their tapers are huge, not correct for a Mark 25 crank. Thanks and enjoy.

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  2. #2
    Team Member BJuby's Avatar
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    I am still in search of a flywheel for FA-90. Please direct me to anyone that might have one if you know. Both loopers FA-90 and FD-53 were sent out for piston and ring fittings. Thanks a lot.

  3. #3
    Team Member BJuby's Avatar
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    Some pictures just came in from Steve, who is making the pistons for FA-90






  4. #4
    Team Member BJuby's Avatar
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    Got the front and mid crank cases back with modified Mark 25 cage along with head back today. The crankcase cleaned up very nice. A sharp eye can see that on the front of the front crank case there is a number 90, which coincides with the block serial number FA-90.




  5. #5
    BoatRacingFacts VIP John Schubert T*A*R*T's Avatar
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    Quote Originally Posted by BJuby View Post
    I am still in search of a flywheel for FA-90. Please direct me to anyone that might have one if you know. Both loopers FA-90 and FD-53 were sent out for piston and ring fittings. Thanks a lot.
    Brandon,

    Not sure I remember which 2 cylinder motor but Merc made one that the hub bolted to the rest of the flywheel & the taper was the same as the MK25 crank. I've used them on my Loopers. You can also take a regular MK25 crank & have it machined, and if you go with the Thunderbolt ignition system, you'll nee to have the outer diameter of the base machined & pinned to accept the pulley for the belt

  6. #6
    Team Member BJuby's Avatar
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    Thanks John. Steve found us a flywheel hub with pulley and is fabricating a rope sheave for us. I will be using the battery driven mercury system for this engine, just like the A looper you had (which by the way looked very nice).

  7. #7
    Team Member BJuby's Avatar
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    For some reason wouldn't let me attach photos and text, weird. Anyway. Pistons are finished, rope plate is also done. Next is ignition adapter plate.

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    Team Member BJuby's Avatar
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  9. #9
    Team Member BJuby's Avatar
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    Some work on the A looper. Got the reed cage together and assembled on the Mark 25 crank. Next I will be installing both top and lower bearings and checking for end play. This is all with the pistons removed, I removed them after I checked the way the washers I had fit.

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  10. #10
    Team Member BJuby's Avatar
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    New set of CCMS fiber reeds arrived and are now installed on the reedcage. I have stumbled across an issue with the crank to crank case assembly. From the picture below you can see that the crank case wants to accept two ball bearings on the upper side. Those who are familiar with mark 25 cranks know that the surface area of the upper part of the crank is only enlarged enough to accept one bearing. I am going to have a custom bearing made to accept the smaller diameter area of the crank, or find an existing bearing of the correct specs. This one bearing is now holding up the engine from being completed.

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