SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Hawaiian22 on August 11, 2011, 08:44:25 AM
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Hey All,
I'm new here.. so please go easy on me.. I just bought my first jetboat. It's a 22ft Hawaiian with a 460 in it. I am having a lot of problems with it. I had it out to Havasu a few weeks ago, and couldn't get it started, killed the battery trying to get it started . Put a new battery in it, and noticed the choke was disconnected. I plugged the wire in, and it started right up, and ran for about an hour then crapped out. It then required a squirt or two of quick start to get it running. When I can get it running now, I have to keep my foot on the gas, it won't idle. It runs incredibly rough and shakes badly for a few seconds then shuts off if I let it idle. (When I had it running at Havasu it ran really smooth, and idled really well before the "crap out".) I took the carb off, and cleaned it. The previous owner decided to stack a bunch of gaskets, and thin aluminum spacers to make a 1/2" thick or so spacer, which I replaced with a 1" spacer from Pepboys. The carb is an Edelbrock 1410 marine carb.
My questions are.. Is the 1410 and a 1" spacer a good setup for a pretty much stock 460? A few things I've read say a 600cfm or 650cfm would be better than a 750cfm for what I have. One mech at a marine shop told me that he does not use the choke, and wires them "hot" or something.. does that sound right? Also, if I decide to get a new carb can I use a non-marine carb, or will I be looking at a lot of problems.
Thanks,
-Kory
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Have you replaced the fuel filter?
Is the gas tank clean and are you using fresh fuel?
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Have you replaced the fuel filter?
Is the gas tank clean and are you using fresh fuel?
Yeah, the filter is new, gas is fresh. There is plenty of fuel getting to the carb as far as I can tell. I'm not sure beyond that point. I haven't seen anything getting trapped in the filter yet. When you say fuel filter.. do you mean an inline filter, or is there another one somewhere that i may want to check as well?
Thanks!
-Kory
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Yes he means inline. You should have one inline to the carb or from the fuel pump. The 1nch spacer shouldn't have nothing to do with why it runs like that, and I would stick with the 750 personally and go with a holley. It doen't have to be a marine carb. Only difference I think is the vent tube. prevent less flooding.
You might of done somthing when you cleaned the carb. Floats could be stuck open or set to high. needle could be bent or screwed up or you can just have dirt stuck were your needle and set is. Alot of things come into play.
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750 is o.k., but an 850 would be better..., a marine carb is best
Lakes Only prolly will shed some light on this matter
Thats all I got
Daniel
Mash on it
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750 is o.k., but an 850 would be better...,
More fuel is always better. ;)
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X 2 on 750 or 850 460 need lots of fuel and air, 850 would be better
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if I decide to get a new carb can I use a non-marine carb, or will I be looking at a lot of problems.
Thanks,
-Kory
Welcome to SCJB ;D
If your boat has an engine cover it is required to have coast guard approved marine components including carb, fuel pump, distributer, alternator and starter.
As for the driveability issues don't just assume that it's the carb causing the problems. You need to check the other systems also (ignition and fuel supply to start).
P.S. If you change carbs for more than testing, DON'T go to a smaller carb, you will notice a difference and you won't like it :thumbdown:
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Thanks for all the input on this guys! I'm going to stick with the 750 for now, maybe go bigger once I get it running smooth etc. I found that the accelerator pump seal had a small crack/tear in it. So I'm hoping that is where the big part of the problem is coming from. Everything else in the carb looks okay, and the floats are swinging without any hangups. I also seem to be having some ignition problems... So I'm going to replace all of that stuff as it is really old and rusty.
Thanks!
-Kory