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Old 29 March 2013, 04:25   #91
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Have you lifted the engine on the transom yet. In the first pics it looked way too low ad this would hamper your performance.

Also it would be worth checking the engine over to make sure the throttle is fully opened at WOT. As over time cables stretch and setting need tweaking...

I agree that a 90 2 stroke will be great however you might be able to wring a little more out of the Honda.
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Old 29 March 2013, 05:31   #92
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Quote:
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Have you lifted the engine on the transom yet. In the first pics it looked way too low ad this would hamper your performance.

Also it would be worth checking the engine over to make sure the throttle is fully opened at WOT. As over time cables stretch and setting need tweaking...

I agree that a 90 2 stroke will be great however you might be able to wring a little more out of the Honda.
Haven't raised the engine yet, thought i would move the consoles first.
I'm a little hesitant to lifting the engine as worried about stability.

As for squeezing a few more horses from the engine I think i may take it up to samspeed marine in glou for a dyno tune if its not too expensive now, they tune the boat in a tank.

Probably best to save the money and put towards a Yamuna 90
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Old 29 March 2013, 06:46   #93
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I agree that a 90 2 stroke will be great however you might be able to wring a little more out of the Honda.
good point run it on Nitro
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Old 29 March 2013, 09:45   #94
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Can't swear my engine is totally in center(need to check) but have a vague memory that previous owner moved the engine from offset to centre of transom, so not so sure that is the issue, as it works fine on this boat.

At least I would not start with moving the engine sideways at this stage. But would try another propeller and also playing with weights also sideways. My console is offset to starboard.

I just measured for checking. Engine in my boat is in center of transom, spot on.

Here a video of mine set-up

Skip it until 7:09 , there it is doing about 39.5 knots. Boat has Teleflex steering having some play as usual. Boat was little stern heavily loaded this time.

I am convinced that one can get a SR to handle OK with a 175 kg lump. If knowing the location of LCG with the 90 Yam, then moving the battery, tank and maybe console to obtain the same LCG with the heavier engine, handling should not be that much different? Total weight (affecting performance) will be higher though. Another option is to move a 20 kg led weight, guess putting that in the bow would already pretty much keep the LCG in same position.

I love the Yam 90, but it is little noisy....wonder how is it compared to the sound of a 90 optimax?
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Old 29 March 2013, 13:31   #95
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Just had another look at the outboard height and the cavitation plate is probably an inch below the boat so i think i should bring it up a notch and make it level.
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Old 29 March 2013, 13:36   #96
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Is this Too low, I have always thought cavitation plate should be level with bottom of hull
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Old 29 March 2013, 14:36   #97
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bring it up one hole
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Old 29 March 2013, 15:47   #98
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Up one hole, I think it could go one more.
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Old 29 March 2013, 18:15   #99
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It looks better.Try it first.
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Old 30 March 2013, 13:41   #100
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Quote:
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Up one hole, I think it could go one more.
That will be much better. Try adding some weight to the bow also. Poss sandbags to start. I had to do this to one of my seariders then eventually grp 40kg into the bow locker. Works a treat and still gets 34kts. Good luck
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