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without engine mods i doubt it, but every engine is different. Just try it and see, i doubt it would require much carb jetting at all. It is just changing the reed valve material, why don't you ask...

stock reeds should be fine at that rpm, but for longevity glassfibre reeds are safer, generally the carb will lean out slightly, but it is probably to rich to begin with, you can try the next main...

Its a 81 Suzuki DT8 10ci twin cylinder, its a very good engine, we used to race them over here in the 'avon decent' dinghy race and they were good for 34mph.

mine has serious mods and the new carb...

well for those interested on my 10ci Zuki

I used the zinc plated 10.9 grade steel hex bolts(with loctite antiseaze), torqued up to 50Nm. I now have 210 psi and will run 98 octane

i have ported...

Hi Guys,
What do you guys use for head bolts on outboards
From what i can see the choices are either grade 8.8 galvanised
or grade 12.9 zinc plated
i use this engine in the...

a 20mm carb sounds a little on the small side, i run a 24 on my 164cc motor and it loves it.
i too have the 190 psi comp and run pulp fuel over here which it 95 octane.
i would suggest some port...

i would suggest the work would not be worth it
twin carbs can be hard to tune and you may not be running the rpm to make them useful
if you are running greater rpm than stock then certainly they...

check out boats.net compare part numbers jets ect is usually the way to go

yeh 185-190 is what it puts out, maybe i took off a tad more like 1.5mm
all depends on the cylinder stroke and bore to how much you will gain.

Probabaly the safest method is to measure the...

to give you an example i took 1mm (40 thou) of my twin cylinder, this increased the compression from 115 to 190psi. I run 95 octane at 30:1 and she runs hard!!

Two strokes are all about the squish...

I assume you have played around with the trim and weight distribution?
try trimming it in
i have a light boat an experienced the porpoise ride! it can be scary
buy a bigger pitch and drive right...

10foot aluminium jon boat! yes certainly no race hull but a super fast fishing hull!
weight is important as although i live 5mins from a river, there aint no boat ramp.
Thus i have to carry both...

I recently made a pad to suit my shallow vee bottom. The dimensions were very much guess work and scaled from bigger boats. However it is 240mm wide at the stern and tapers down to 60mm at the bow....

are you running it though an auto gearbox or just direct 1:1 ?
what angle does you propshaft run at? have you tilted the engine or used a universal joint.

cheers
kael

yes there is no substitute for cubes at the end of the day.
makes me think about using a 250cc mx engine 40+hp and six speeds !

Wow i have gotta see that!!!!!!

That sounds great, have you thought about a jet ski engine? I think the biggest problem with motocycle engines is lack of torque, even if you used a gearbox i think the boat would would slow down...

Hi Guys,
I enjoyed Ron's DIY outboard race motor and it got me thinking?
How about using the same ohv 4 stroke motor and mounting it inboard?
connecting straight to the prop...

next mods will be vee pad hull mods, new carb and adjustable tilt.
ATM running the stock carb max rpm is 6100 @ 30mph.
Any ideas for an adjustable tilt system, atm i an stuck between two pins,...

Becareful here, latent heat of evaporation refers to the amount of heat to convert from liquid to gas. and i quote:
Methanol and ethanol have a very high latent heat of vaporisation, i.e., it takes...

Adding ethanol to petrol will increase its octane number which allows you to run higher compression and advanced timing, For a while here in oz you could get cheap 95 octane E10 ethanol blend which...

Methanol has a 50% lower BTU than gasoline, however the ideal methanol/air mixture is 1:5.5 which is more the 2.3 times fuel than if gasoline(1:13) is used, thus the heat produced is approx 17% more...

definitly check fuels hoses to see if they are compatable to ethanol.
You should not have to retard timing, however expect less bang for you buck, ethanol has a much lower energy rating than...

Hi Guys,
Just had my first run in the worked Suzuki 10CI,here is what i did to her.
Compression was 110psi and squish band was 2.3mm. I shaved the head 1.0mm and block 0.2mm, now i...

Yeh thats what i will do, i will try to get a copy of bill russels book and design a pad using his principles. Might be fun to bolt on a test pad and see if a get some improvement. When you think...

would not widening the pad make it less likely to chine walk? but obviously slower

i may make a bolt on aluminum pad and play around with dimensions to reduce chine walk and increase top end speed

Hi Guys,
I thinking off turning my vee hull into a vee pad. I want the hull to climb onto this pad at WOT and hopefully get me a bit more top end speed.
Keep in mind this...

thanks for the replies guys,
i ended up leaving the exhaust tube outlet below the cav plate. I just opened up the three holes on the midsection slightly from 4-6mm. Should make it slightly louder if...

i guess when you look at it above water exhaust has constant backpressure regards of boat speed. where as thru prop exhaust backpressure changes with boat speed. As no or low speed backpressure =...

i am curious about say a merc 25xs v standard 25. The xs has the racing lower unit and above cav exhaust outlet. where as the stock 25 has thu prop exhaust. Would seem like the different exhaust...

motorcycle cdi boxes can be had from $30 up, the only problem is finding out the advance curve spec. However if you have mechanical advance cdi ignition like my suzuki then a cheap DIY option is...

i realy can not find any info on this engine?
its an 81 dt8 and yes 7000 does seem a bit high, but the way it pulled from 5-7k was awesome! I will look to go to a 2" higher pitch to bring it down to...

Hi guys,
just ran the 10ci Suzuki on my microbass boat and my god did she fly!
Topped 30 :)easy @ 7000RPM:(. Yeh while i get my prop repitched i am thinking of doing some exhaust...

i took it for a run yesterday and got 5300. i have yet to lift up the motor, could probably go up 40-60mm from were it is atm. Getting on the plane was no worries then it took off. So with engine...

regarding timing spec says 5 @ idle up to 30deg@6000rpm.
i have read that retarding the timing at high rpm is prefered for motoX, however is this a tuner pipe 'powerband' aid?
I will have a play...

yes it is a tohatsu (nissan), carb is a 30mm Kiehin. Gear Ratio is 2.15:1.
has got a though prop exhaust. It is linear and you can definitly buy cranks.
it is still being manufactured today.

Come on guys sharing is caring.
Please give me some tips before i butcher a perfectly good merc.
Does any one know what the stock timing is?
and is it fixed or does it advance with RPM?
are...

over here we can get a 9.8hp tohatsu that weighs 26kg!

Hi Guys,
I have the following setup here in OZ.
Hull : Fibreglass shallow 5deg V hull, 8ft x 4ft beam . hull weight 55lb (25kg)
Motor: 2010 5hp Mercury, 2 stroke, 6.2ci. (102 cc), 44lbs (20kg),...