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Old 25 July 2018, 01:18   #1
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New Suzuki 150 challenges

First time out and comparing her, inevitably, to my late lamented Opti of the same power....

Two challenges -

A) I can't read the gauge in the sunlight on my console. Any suggestions as to how to increase brightness, contrast? No comparison to the Smart Gauges when i could see revs clearly

b) more seriously, she seems to be settling in the water deeper than she did. And even fully trimmed in she is chucking up a lot of water. Nonetheless she seems very nippy and very fast at given revs - although I have not yet run her at full throttle. Is this a problem with height of the engine, or do I need to add weight in the bow locker, change prop, or what?

Any ideas as always greatly appreciated.

Thx

Bruce
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Old 25 July 2018, 04:02   #2
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No need to Panic.
Defiantly sounds like an engine height/rigging adjustment needs to be made....water just on or lapping a bit over the Cav Plate at rest,whith level trim is a good place to start.
Ive had simillar issues in the past when re-powering but it's soon sorted
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Old 25 July 2018, 05:28   #3
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Quote:
Originally Posted by Maximus View Post
water just on or lapping a bit over the Cav Plate at rest
If your motor is that high up your impeller isn't even in the water.

I assume you mean the second plate, not the anti cav plate immediately above the prop?
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Old 25 July 2018, 05:41   #4
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Its irrelevant where the engine sits at rest its the relationship of the cav plate to the keel line that matters
Id probably start 1" up from level and keep moving up till I got best performance without excessive ventilation in turns or lumpy conditions
The spray usualy comes from the water hitting somewhere it shouldnt
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Old 25 July 2018, 05:55   #5
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Its irrelevant where the engine sits at rest its the relationship of the cav plate to the keel line that matters
Id probably start 1" up from level and keep moving up till I got best performance without excessive ventilation in turns or lumpy conditions
The spray usualy comes from the water hitting somewhere it shouldnt
Should point out that I know this.I was just making the point that the clamp shouldn't be levitating 2 feet above the transom
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Old 25 July 2018, 07:51   #6
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Quote:
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If your motor is that high up your impeller isn't even in the water.

I assume you mean the second plate, not the anti cav plate immediately above the prop?
.....Maybe I shouldn't presume too much on here eh!
As I said it's a good starting point.
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Old 25 July 2018, 08:59   #7
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Thanks for advice. Assume I know nothing; it's always the safest bet. This rigging business seems an art form not a science! Any more advice?

If I raise the engine I am going to have to raise the A frame... the new engine hood is much higher than the Opti one and I can't fully raise the engine already without it hitting the A frame.

I suppose powered trim tabs might be a solution....
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Old 25 July 2018, 09:26   #8
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maybe a photo of the engine trimmed down so you can see the cav plate in relation to the keel - as beamishken suggested
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Old 25 July 2018, 11:37   #9
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Quote:
Originally Posted by brucehawsker View Post
Thanks for advice. Assume I know nothing; it's always the safest bet. This rigging business seems an art form not a science! Any more advice?

If I raise the engine I am going to have to raise the A frame... the new engine hood is much higher than the Opti one and I can't fully raise the engine already without it hitting the A frame.

I suppose powered trim tabs might be a solution....
By the time you buy and fit trim tabs youd be better off altering the A frame and setting up the engine properly.
The engine height at rest tells you nothing it could be several inches different depending on the hull shape.
Get a straight edge along the bottom of the keel and with the engine plumbed level the cav plate should be level or slightly above the keel. I usualy start about an inch up from level and then move up till im happy
Check that the trim limit pin isnt right in allowing you to trim too far in causing the engine to run deeper than desired
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Old 25 July 2018, 12:18   #10
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if you are spraying a lot of water then chances are you need to go up with the engine.

modifying the A frame won't be a big deal if you have a competent welding shop local

most people suggest suzuki like to run deep due to the big props they use, i found when i bought my RIB it had a bad port list underway due to being too deep so i went up 1 which puts my engine about 1" above the V and it is happy there, it will only blow out if you are fully trimmed up and go hard over, a compromise i'm happy to live with.

need to check the can plate when underway, no other way to do it really.
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