Prop, carb, rpm questions..
08-23-2010, 01:17 PM
#12
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Baja h2x 24.5ft. Best top I got was 70 mph @ 4500rpm, 2 people with 40gal(1/2 tank). I have 850 carb dual plane intake. Stock 7.4mpi exhaust. When my carb wasn't jetted right it was pinging and I was turning 4500rpm also but only 65mph. With the right jets it picked up 5mph. Everyone thinks the stock exhaust is holding back at least 400rpm or more...now its waiting game for new gen3 stainless marine exhaust. Make some hard pulls and stop to check color of plugs. See if your fuel is correct. Clean the carb.
08-23-2010, 01:35 PM
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Just to give you an idea on my rejet, we had to go 7 sizes up on the low and 5 sizes on the high. This a proform 850 race carb. We also turn back the ign timing abit. I've also done research on OSO and people picked up more hp and rpm with 1050 dominator single plane on 540ci NA.
08-23-2010, 02:11 PM
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Just to give you an idea on my rejet, we had to go 7 sizes up on the low and 5 sizes on the high. This a proform 850 race carb. We also turn back the ign timing abit. I've also done research on OSO and people picked up more hp and rpm with 1050 dominator single plane on 540ci NA.
hmm... the same guy that has the 1050 also has a performer single plane for 100.00.. Wonder if i should try it...
08-23-2010, 02:13 PM
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It averaged about 64 mph, but it would do that all day. Sunsation hulls are pretty fast hulls.
08-24-2010, 08:28 AM
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750 is not going to cut it..even the stock HP500 came with a 800 and 850 going to be a min and dominator not going to be a bad idea with a 540..will add h/p, exhaust can be a killer
08-24-2010, 08:39 AM
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Im gettin the dominator today and going to make some more pulls. I would think stainless marine manifolds would be enough right or wrong?
08-24-2010, 01:20 PM
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Sicksation, your exhaust in pics looks to be sufficient for now but please check the gaskets or replace it just in case. Try the dominator first . I ordered stainless marine gen3 5" tailpipe and will let you know how it performs. I haven't tried dominator with single plane yet, thats my next step when new exhaust is calling for more fuel. good luck I think your going right direction.
