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Old 05 July 2006, 03:52   #11
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Country: UK - England
Town: Chertsey
Boat name: Aqua Legends I
Make: Avon Searider 5.4m
Length: 5m +
Engine: Yam 90
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Quote:
Originally Posted by Pete7
Best guess a 19" prop, I have a 19" S/S Yamaha prop if you want to borrow it for the day, there is a 17" Ali in the garage too.

Pete
Thanks Pete I might just take you up on that. I'll give you a shout once I have the engine fitted.

Quote:
Originally Posted by Downhilldai
It's probably ok, but would look out of place on your boat as it's 1990 vintage (no disrespect Narcosis, but Floater's boat is a bit shiny for it!)
No disrespect taken, I now my rig don't look new, more like a hard working boat. Thanks for trying your mates though.

Quote:
Originally Posted by floater
nah i couldnt stick this on the Avon could I??
but it would shift
what weight is it?
I have seen a something similiar rigged, but as Downhilldai said, your Avon is blinging next to my Avon + engine.
I think it weights about 155kgs.
Seeing your Avon this weekend made me think about replacing or cleaning up my straking a bit, nice tidy rig you got though
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Old 05 July 2006, 04:17   #12
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Country: UK - England
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Make: Zodiac Medline
Length: 5m +
Engine: 60hp Yamaha
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I have seen a something similiar rigged, but as Downhilldai said, your Avon is blinging next to my Avon + engine.
I think it weights about 155kgs.
Seeing your Avon this weekend made me think about replacing or cleaning up my straking a bit, nice tidy rig you got though



Thanks really enjoyed it
155 is too heavy as its only rated to a 50 and max weight i think is 105kgs
it does feel under powered all up and i dont think that the engine is running at 100%
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Old 05 July 2006, 04:54   #13
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
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Ollyit's got one on his 4m hasn't he?

Is this the same engine?
(nicked from Ollyit's site)
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Old 05 July 2006, 05:15   #14
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yeah mines about 1989/1990/1991 I think from the serial number - the acceleration is nice, ull havta grow sum balls to take it flat out, can be sketchy up front but I put that down to my boat setup,
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Old 05 July 2006, 05:31   #15
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Country: UK - England
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Boat name: Aqua Legends I
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Also I checked my engine weight and aparently its 105.5 kgs (60hp that is)
Funny that, all of a sudden its light enough to go on a Avon 4m is'nt it?.
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Old 05 July 2006, 05:33   #16
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I think that might just be what happens to an sr4 when it's going ridiculously fast....mine's a bit like that at WOT too but it's all good for an adrenaline rush I put a 14" prop on my 50 and passed 42mph with it.... Chinewalked a bit though!
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Old 08 July 2006, 06:34   #17
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It's now turned around and my mates are interested again. I think the investment in a new 75 e-tec was causing some matrimonial disharmony.
I've pm'd you my details, so give me a call if it's still available.
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Old 15 July 2006, 15:38   #18
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Country: UK - England
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Ok, heres the story so far.

Had my new Yam 90 fitted Friday, looks good, early 90's model, no more pre mixing my 2stroke mix in the fuel tank.

Had a few tweeking problems to over come, but most have been sorted.

But the biggest issue has been around the prop size. It turned out the Yam 90hp came with a ally prop with 13x19 stamped on, and it performed badly, grumbled at low revs, and various other things, but mostly no top end, max revs about 4100 is all I could get.

Swapped it for another ally prop with 17 stamped on it. Made a big difference rev'd better, got revs up to 4900-5000. Doing more tests tomorrow.

Can any one tell me about the prop marked 13x19, what this means etc.

Regards
David
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Old 15 July 2006, 15:54   #19
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13x19 = 13 inch diameter, 19 inch pitch
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Old 15 July 2006, 16:18   #20
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Quote:
Originally Posted by Narcosis
But the biggest issue has been around the prop size. It turned out the Yam 90hp came with a ally prop with 13x19 stamped on, and it performed badly, grumbled at low revs, and various other things, but mostly no top end, max revs about 4100 is all I could get.

Swapped it for another ally prop with 17 stamped on it. Made a big difference rev'd better, got revs up to 4900-5000. Doing more tests tomorrow.

Regards
David
Hi David,

My Searider 5.4m had a Mariner 2 stroke 90hp on it. Came with a 19" pitch ally prop and went well with it. Pulled 5400rpm to give about 38 ish knots.

Fitted a 20" pitch stainless prop (Lazer II) and still pulled 5400rpm for almost 40 knots (39.7 to be precise - could never quite break the 40 barrier )

Yamaha gear ratios might be different to Mariner so you might need a smaller prop, but I doubt it.

What boat speed are you getting?

With a 90hp on a 5.4m Searider the acceleration should be brutal (quicker than my 6.5 Scorpion) if all is well. Flooding hull was as standard btw - it didn't slow things down noticeably!

I hope you get it sorted - I would recommend getting a GPS on board then you can factor RPM / prop size / boat speed to determine if you have a set up problem or an engine performance problem.

Regards
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