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Old 01 November 2013, 02:57   #1
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Boat name: Mwaozi Tumbe
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My New RIB Project

Hi All,

I have been reading the forum for some time while I didn't have a RIB and have been on the look out for a decent priced little motor.

I think I have done quite well, I managed to buy a Prestige 475 that has been stood dry for 5 years on an island in a Lake about 100K from Nairobi (living in Kenya).Got the boat for nothing, I cold recoup my money just off selling the road trailer... so I am chuffed so far.

The RIB has a 90hp Yamaha engine on it, the hull seems in good nick and the deck is better than expected after a wash, although it has two jam jar lid size cracks/holes towards the bow, its should be a simple fibre glass fix.

All three chambers inflate - but then deflate rather quickly, I am going to use some hot soapy water and a biro to try and locate most of them later today.

Advice I would love:

1. Best way to check for punctures
2. How to go about giving the engine an MOT
3. How to smarten up the PVC tubes once they are all patched and sealed
4. What glue/materials needed for tub restoration
5. Any other tips and pointers from you experts.

I have just rebuilt a Land Rover with no former experience and picked everything up off a forum so I am hoping for the same result here!

Pictures to be added in next post.
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Old 01 November 2013, 03:40   #2
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Hi Huffie, welcome to RIBnet

Guess if you've rebuilt a landrover then sorting a rib should be straightforward, you'll get plenty if advice on both on here

looking forward to the pics of your rib
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Old 01 November 2013, 04:13   #3
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Pictures:

Getting a boat through the thick hyasinth swamp!


The Boat after we pumped some air into her






Launching into the water


On the water (followed by 3 hours of 12 blokes cutting at the weeds and walking waste deep to make a channel to drag the boat through).


Time for a beer after the afternoons work!


On the land after all the air was released.
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Old 01 November 2013, 04:43   #4
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great pics Huffie

looks like you have your work cut out sorting the rib, but guess it will clean up nice, and go well with a 90 Yam, keep the pics coming so we can see how your getting on

nice landrover too, just right for towing the rib
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Old 01 November 2013, 04:45   #5
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great pics Huffie

looks like you have your work cut out sorting the rib, but guess it will clean up nice, and go well with a 90 Yam, keep the pics coming so we can see how your getting on

nice landrover too, just right for towing the rib
- Thanks Chris, I have no idea where to start or how to go about fixing all the punctures, restoring the tubes etc. Any tips on where to start. I a quick learner and good with my hands ?! Just need telling what to do.
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Old 01 November 2013, 04:54   #6
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- Thanks Chris, I have no idea where to start or how to go about fixing all the punctures, restoring the tubes etc. Any tips on where to start. I a quick learner and good with my hands ?! Just need telling what to do.
fixing leaks ain't my strong point, but I guess someone will be along very soon with some good advice on where to start, do you know what material the tubes are made from, hypalon or pvc as repair methods are different for both. good news is that the tubes do hold air for a while so should be repairable. have you checked it's not just the valves that are leaking, try blowing the tubes up hard and using soapy water look for the bubbles, especially round the valve. valves are usually straight forward to sort out, maybe just need stripping down and cleaning, rebuilding will sort some / all of your problems
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Old 01 November 2013, 05:01   #7
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fixing leaks ain't my strong point, but I guess someone will be along very soon with some good advice on where to start, do you know what material the tubes are made from, hypalon or pvc as repair methods are different for both. good news is that the tubes do hold air for a while so should be repairable. have you checked it's not just the valves that are leaking, try blowing the tubes up hard and using soapy water look for the bubbles, especially round the valve. valves are usually straight forward to sort out, maybe just need stripping down and cleaning, rebuilding will sort some / all of your problems
Its good news that you don't think its a lost cause, I had no idea! I need to buy a pump, finding one in Nairobi is impossible. I cleaned it with some hot soapy water last night, all be it with no air in the tubes and she's looking better. I'll go take some more pictures now - try to incise people to the thread!
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Old 01 November 2013, 05:06   #8
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First 20 minute clean, hose pipe and a sponge


The cracks, about 3inches by 2 inches each.


three of the values look like this


Not sure whats this is called but its the bit that raises up the motor and lowers it. Apparently its dead and i need a new one, whats it called?? How much are replacements?


Engine bits


And again
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Old 01 November 2013, 05:45   #9
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Hi it's a power trim and tilt, very expensive to replace but well worth having a go at repairing your self.
One of my jobs to do on my Yami 50 is to strip down the power tilt as it drops down over night if left
Tubes look much better after the wash, need to get some air in them and with all that gunk around them makes me think they may be your problem!
If you do not have a pump, one idea would make up a set of bellows would be straight forward to do, or if you have a vacuum cleaner the revers the polarity on the motor so it blows in stead of sucks
Or one other idea would be to use the exhaust from the Landy to blow it up, works on lifting air jacks!
Is the floor fibreglass?
Great engine those yami 90s
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Old 01 November 2013, 05:46   #10
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Engine bits


Owners Manuals | Yamaha Outboards

If you go on the Yamaha Outboards website there is also a good number of support pages on early models plus free manuals. I also found good help on the Q&A section.

Good luck on the restoration! Great place Kenya - but watch out for the crocs!!
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