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My old 200 had high comp cold air intake and total seals spun 68x36 paddle 2950

Wood pushes better to me depending on whether or not you got exactly what you need but when they die they did hard I learned that lesson

The rotax call ricks rotax in ft Myers the other snowmobile engine won't make the tq a 320 will not the same at all also you need a gear reduction the rotax are built for that but hull width and weight should be primary concern

The trick is the width you need 6 ft across the bottom a Jon boat is maybe 3.5 -4 ft my first boat was 6'6 x 10 with a Lycoming 200 and II had a ton of walking room if you make a mini 6 x10 with a 670 rotax it will float in 2 inches of water you need width is super critical more than the extra 2-4 f...

You don't need 15 ft anything for one person a 6-6.2 bottom x 10 ft out of 80 th built lite by don Davis or John Fenner someone like that with a 670 rotax will do well over 40 mph great on fuel and with frog spit on dry with just a single person 90hp and reliable electric start and if he gets stuck ...

I would dyno the motor best way to dial in a/f and timing also you'll have real #s to use to get the right prop

Lycoming is like buying a Harley and cont is kinda like a hardly 540 is always worth more

It's a roller so no cam break in 20-50 is way to thick comp sells break in oil also I would heat cycle at least 5 times get it up to temp then complete cool down helps with ring seal if you just run it the rings lose tension if you built it right the oil will stay clean for quite a while good luck t...

The heads are important but the combo is 10x more critical the wrong cam intake carb timing etc will make or break a motor sounds like you have decent heads maybe find a great engine builder get some mild bowl work lite port work better can and intake Afr heads are good 23 deg heads but you will gai...

If you already have a decent set of alm heads I wouldn't switch the heads a zz4 STK should be easy to get another 80-100 HP out of it with other changes

Yes I have a set 383 pump gas 480 tq 4700 and made 503 HP 5900 and that was realized HP tq not corrected and I have a small cam below 500 l and 235 @ 50

Joe Gibbs hr1 oil or switch to a retro roller cam

Yes my boat was faster top end quicker and push hardest at 3000 remember the rpm doesn't matter it's where your engine makes the most hp spinning a motor that makes 200 hp at say 3000 only 2600 will probably only make 170 hp it's not 200 hp from idle to whatever every engine has a sweet spot I've ha...

Your phasing is off

More rpm 3000 was the sweet spot for my 200

Slick bottom

His is a good guy funny as hell praying for a speedy recovery

if the hop is only at low speed you can put a small obama on either side where the hull runs in the water at low speed then when you want to haul arse you can and don't have a great big obama right in the middle that can get torn off two small ss tabs will work contact john fenner he is smart honest...

i would invest in a jw flex plate what condition is the harmonic balance in they will lose the outer donut and or turn

First thing to do is make sure you are getting the power out of her now what carb intake timing etc you maybe leaving a lot on the table just an idea find someone who really knows how to tune the carb jetting and timing can add a ton

Call comp they will give you expert advice

And if you think a stock 351w is going to be happy at 5500-6000 you're wrong oiling will need some help boats run higher longer than cars

Promax heads will work great and cheap a single plane intake smaller than a Vic jr and the right cam something below 235 @50 and under 500 lift run 10-10.5 comp and she will run well and do it cheap if you want nasty I can put u in touch with an so blk steel 4340 crank Carrillo rods je pistons solid...