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Old 20 September 2008, 17:18   #51
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Country: UK - England
Town: cornwall
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Make: rib eye 430
Length: 4m +
Engine: tatsu 50
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Quote:
Originally Posted by Easyrider View Post
Was you on 1/2 choke or no choke at all???
I started it with choke , and as usual pushed it back in right away after it started . i first thing i checked was the choke so not that . Why it should suddenly go well again after a short tickover I don't know. it was all a bit of a scramble gettin off the beach with my old mum on board the surf had picked up a bit and she was a bit scared ,
even better the other end we took a wave over the stern as we landed and mum just sat there in a beeched boat half full of water asking if she needed to help pump out
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Old 20 September 2008, 17:54   #52
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Country: UK - England
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Make: Ceasar Surfcat
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The reason i asked about the choke was that i noticed this sort of thing after i leaned the mixture out on the carbs. Before i leaned it out i used to start it with full choke (when cold) then push the choke in straight away and go-once it was leaned out a bit, it would be flat as you described it with the choke in but fine on half choke(when cold). I now allways start with full choke then run it on half choke for the 1/4-1/2 mile then shove the choke in. Runs a treat for me that way.
Have you checked your plug colours after a run yet?
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Old 20 September 2008, 18:46   #53
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Quote:
Originally Posted by Easyrider View Post
The reason i asked about the choke was that i noticed this sort of thing after i leaned the mixture out on the carbs. Before i leaned it out i used to start it with full choke (when cold) then push the choke in straight away and go-once it was leaned out a bit, it would be flat as you described it with the choke in but fine on half choke(when cold). I now allways start with full choke then run it on half choke for the 1/4-1/2 mile then shove the choke in. Runs a treat for me that way.
Have you checked your plug colours after a run yet?
Not much point looking at plug colour yet until I get it on 50-1 they are just a bit oily at present , but the uderlying colour when I clean the oil off isn't bad , probably a tad rich. The motor sounds rich , but the double oil mix must play hell with the jetting anyway.

Its really great to have a motor i can sort out and understand without a dealer and a computer .
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Old 20 September 2008, 20:01   #54
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Country: UK - England
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Quote:
Originally Posted by ian parkes View Post

Its really great to have a motor i can sort out and understand without a dealer and a computer .
Exactly the reason why i brought mine- 4 months before i found a surfcat at a reasonable price!!! Sounds like we were the last two(for the domestic market) in the country to get our hands on them. Rescue services and race teams can still get them imported though.

Heres a link to the ign timing setup for our engines.


http://www.thundercatinflatable.com....2&d=1196750920
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Old 21 September 2008, 16:35   #55
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I checked the air screws today they were all set around 2.5 turns out , I tried them at 1 3/4 but the tickover dropped to 750 rpm and it didn't sound so good so i they are back to 2 1/2 again . certainly no issues with the wires interfering with the timing advance iether .
next thing i want is a bladder tank or a transom tank if one will fit. Just got to find a decent price on a bladder preferably .
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Old 13 October 2008, 19:10   #56
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I would really like to get this motor set up properly so to update this thread here's whats happened so far .

I called extreme marine to try and get a manual and some info . They told me to call tohatsu uk which i did . They just informed me that the motor should have a dealer first service after 10 hrs and they would set it up ok . So off i went for my service , and 60 later I am back to square 1 , i watched the dealer and all they did was rev it up and twiddle with air screws arriving at the same as me 2 3/4 turns out . Oh and 12 for the gearbox oil change .

Did a good run yesterday and it oiled a plug twice , no 2 first time as soon as we set off and no 3 about 45 mins later . After that it ran for 4 hrs no problem at all .

I called tohatsu again for some set up info and got to speak to someone very helpfull, the 2 1/2 turns out is standard on all carbs plus or minus 1/4 turn . There is nothing else to set .

THe mistake i made was running it in on 25-1 as tohatsu say , it causes oil to get trapped somewhere in the lower crank seal , and other than striping the motor it will take a good few hrs of running to clean it out . Often a bit of rough water or tilting the motor will release some oil and then a plug oils up . Which would go with yesterday when the second plug oiled after some lumpy water around a headland .
They told me they run them in on 50-1 and just don't use them hard for a
while .

Easyrider iam interested to know how you ended up with very different carb settings , we seem to be getting some opposing info .

Still waiting for the manual
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Old 19 October 2008, 09:02   #57
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I think the speed is too low for this setup... With a 360 rib tiller steered 40hp I used to get 39 knots. As I can see from the pics the engine has to be trimmed much higher. It will go much faster if you do so.
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Old 19 October 2008, 11:47   #58
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Quote:
Originally Posted by reinier View Post
I think the speed is too low for this setup... With a 360 rib tiller steered 40hp I used to get 39 knots. As I can see from the pics the engine has to be trimmed much higher. It will go much faster if you do so.
Not sure how you can see that from the pics . Maybe if i trimmed it out another hole it would go faster , but it would then slip in the turns very easily. where its set now seems to be about right for all round use .

I think this sort of speed is about it for any small rib that doesn't get the tubes clear of the water when on the plane .

I have not tried it alone with no load , could be much faster that way , but all i really care about is economy at about 20 - 25 kts which i have
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Old 24 October 2008, 14:54   #59
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Country: UK - England
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Posts: 105
Quote:
Originally Posted by ian parkes View Post
I would really like to get this motor set up properly so to update this thread here's whats happened so far .

I called extreme marine to try and get a manual and some info . They told me to call tohatsu uk which i did . They just informed me that the motor should have a dealer first service after 10 hrs and they would set it up ok . So off i went for my service , and 60 later I am back to square 1 , i watched the dealer and all they did was rev it up and twiddle with air screws arriving at the same as me 2 3/4 turns out . Oh and 12 for the gearbox oil change .

Did a good run yesterday and it oiled a plug twice , no 2 first time as soon as we set off and no 3 about 45 mins later . After that it ran for 4 hrs no problem at all .

I called tohatsu again for some set up info and got to speak to someone very helpfull, the 2 1/2 turns out is standard on all carbs plus or minus 1/4 turn . There is nothing else to set .

THe mistake i made was running it in on 25-1 as tohatsu say , it causes oil to get trapped somewhere in the lower crank seal , and other than striping the motor it will take a good few hrs of running to clean it out . Often a bit of rough water or tilting the motor will release some oil and then a plug oils up . Which would go with yesterday when the second plug oiled after some lumpy water around a headland .
They told me they run them in on 50-1 and just don't use them hard for a
while .

Easyrider iam interested to know how you ended up with very different carb settings , we seem to be getting some opposing info .

Still waiting for the manual
Update on my mixture settings-they are all at 2 3/8 now-i found that the throttle butterflies were open a fraction too far for a smooth idle.
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Old 24 October 2008, 19:27   #60
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Quote:
Originally Posted by Easyrider View Post
Exactly the reason why i brought mine- 4 months before i found a surfcat at a reasonable price!!! Sounds like we were the last two(for the domestic market) in the country to get our hands on them. Rescue services and race teams can still get them imported though.
Similar situation here. We've got the Algore & his congregation of the brainwashed to thank for that!
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