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  1. onetong8r

    MAG 350 loses power after 20 minutes, need help

    So I just took it out and it ran great :) This is what she did using my handheld GPS: 42mph @ 3500 rpm 47mph @ 4000 rpm 52mph @ 4500 rpm 58mph @ 5100 rpm It may have had another mph or two in it but I didn't have enough space to mess with the trim very much. No stumbles or acting up. It idled...
  2. onetong8r

    MAG 350 loses power after 20 minutes, need help

    Yeah as I said the 53 @ 4,000 rpm was not wide open. It jumped up to 4,000 and wanted to keep going but I'm still working out a lot of bugs including not 100% sure the timing is spot on so that's as fast as I pushed it that day. I may take her out today and see what it does.
  3. onetong8r

    MAG 350 loses power after 20 minutes, need help

    So mine is a 1994 Scarab 22 with a MAG 350 / Alpha 1 gen 2 drive with a Mirage 21 3-blade prop. The previous owner had the engine rebuilt and added a marine grind Erson roller camshaft, Edelbrock marine RPM intake, AFB 750 cfm carburetor, and IMCO powerflow exhaust, thru-hull. It was super loud...
  4. onetong8r

    Water leak around trim hoses on Alpha

    Update: I pulled the aluminum looking block off and realized that I'm an idiot and that's like a cathode plate. So it's actually leaking from just above and dripping down to where I was seeing it. It leaks well below the water level of the bellows. Anything I can do to investigate further or...
  5. onetong8r

    MAG 350 loses power after 20 minutes, need help

    So I don't know if anyone cares but I may or may not have solved the problem. I rebuilt the carb to make sure the jets were clean and everything looked pretty good. I put in new float needles and floats and got everything adjusted again. I am still waiting on some parts to install a fuel...
  6. onetong8r

    Water leak around trim hoses on Alpha

    Hey everyone. I'm slowly working the gremlins out of a new to me Scarab 22 with a MAG 350 and Alpha 1 gen 2 out drive. The first couple of times I took the boat out the bilge was bone dry. The last couple of times it has had probably 1-2 gallons in the bilge. Not enough to pump out with the...
  7. onetong8r

    MAG 350 loses power after 20 minutes, need help

    I read through that thread a few months ago and it is amazing what they did to that boat. The paint and everything is amazing. I'd be scared to death to take it out :)
  8. onetong8r

    MAG 350 loses power after 20 minutes, need help

    I'm sure it's not there. All it has is a little full-port ball valve with MPT connections on one side and a 3/8 barb on the other. I think I'll replace the isolation valve with an anti-siphon valve to be safe. I'm not sure why you'd even need a ball valve there.
  9. onetong8r

    MAG 350 loses power after 20 minutes, need help

    First, please don't be jealous of my Miami Vice purple rubber diamond plate flooring. I got to the hatch and found no anti-siphon valve. There's a ball valve that seems to be functional but not entirely sure why it's there. I pulled the pickup tube and it does have a screen up inside the tube...
  10. onetong8r

    MAG 350 loses power after 20 minutes, need help

    I'm still learning all the little gremlins on this boat. The fuel sender was bad and two owners ago had the floor replaced in 2015. They reinstalled hatches at the front where the fill / vent lines connect and the rear where the fuel pickup is but nothing in the middle so I had to cut in a new...
  11. onetong8r

    MAG 350 loses power after 20 minutes, need help

    Thanks guys! I assume the anti-siphon valve is installed on the tank at the pick-up tube? I'll pull the pickup tube like Grub recommended and verify the screen (if installed) is clean. Is there any way to check the anti-siphon valve other than visual and sucking on it like a check valve? I think...
  12. onetong8r

    MAG 350 loses power after 20 minutes, need help

    I'm hoping someone can point me in a good direction. I bought a 1994 Scarab 22 with a MAG 350 and Alpha 1 a few weeks ago. The engine has the TBIV ignition, a Carter AFB carburetor, good compression, new plugs, cap, and rotor. The timing advances like it's supposed to. I drained the fuel tank...
  13. onetong8r

    Any tips to keeping your boat clean with engine work?

    You guys are awesome! I hadn't thought of the moving blankets and making some reusable cut-to-fit cardboard or plastic pieces. I really appreciate the input. :)
  14. onetong8r

    Any tips to keeping your boat clean with engine work?

    Hello. Long time viewer. First time poster. I bought a 1994 Scarab 22 a few weeks ago. Overall a pretty nice boat but it has a few gremlins to work out. This is my first boat with a nice interior and I drape towels over the rear bench and keep paper towels handy but I still manage to get hand...
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