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Old 03 August 2014, 08:16   #1
D&T
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Not getting max revs on tohatsu 40

I have recently bought a rib with a Tohatsu 40hp 2 stroke. The first time I used it I ran it to full throttle and it reved to 5500 rpm and all seemed good. Today I used it again and it would only rev to 4000 rpm and after a few minutes the engine stopped . It took a while to restart and I thought it had flooded itself, even though I could not particularly smell fuel. I do not understand why this problem has occurred as I have not touched anything.
This is my first rib and I am new to the forum and any guidance would be greatly appreciated . Thanks
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Old 03 August 2014, 08:28   #2
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Fuel starvation is my immediate gut feel.

No one on the list would be the vent seal on the fuel tank was still closed so it struggled to get fuel out and eventually couldn't get any fuel at all. Then when left to sit for a bit the seal will have let a little air in over time and so it was able to get fuel.

Others will be along with other theories...
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Old 03 August 2014, 09:06   #3
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Thanks for your reply, the fuel vent on the tank was open fully
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Old 03 August 2014, 11:14   #4
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Then my next suspicion would be the pipe work. Loose conxn or hole in bulb ... Was the bulb hard after it stopped?

After that I'd be thinking fuel pump... Or dirty fuel...
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Old 14 August 2014, 11:30   #5
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Thought I would give an update

I had an engineer look at the engine and he was shocked to notice that the oil pipe from the reservoir to the oil filter had no oil in it. Luckly I had only ran the engine for a very short time. The cause was a kink in the oil pipe, caused by who put the oil reservoir back, put the oil pipe on, then twisted it to refit.

When I bought the boat and engine from a dealer they was meant to have serviced it, but clearly they did not, as it had been just rebuild and cosmetically restored to "as new" condition. The oil filter was less than hand tight, exhaust manifold bolts under tightened and the carbs totally out of balance. Plus various other bolts loose.

The engine now runs like a dream and sounds totally different.

I am now in the process of trying to recover monies paid for servicing etc. The Company are being "its sold with warranty", "we did service it", etc etc. But I now have trading standards involved and they pointed out that a criminal offence may have occurred.
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Old 14 August 2014, 11:35   #6
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If it's the case that a criminal offence may have occurred then I'd be careful what you say about the subject, and don't name any names - just in case it compromises your case!

But glad you got the engine sorted!!!
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Old 14 August 2014, 11:38   #7
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Quote:
Originally Posted by D&T View Post
Thought I would give an update

I had an engineer look at the engine and he was shocked to notice that the oil pipe from the reservoir to the oil filter had no oil in it. Luckly I had only ran the engine for a very short time. The cause was a kink in the oil pipe, caused by who put the oil reservoir back, put the oil pipe on, then twisted it to refit.

When I bought the boat and engine from a dealer they was meant to have serviced it, but clearly they did not, as it had been just rebuild and cosmetically restored to "as new" condition. The oil filter was less than hand tight, exhaust manifold bolts under tightened and the carbs totally out of balance. Plus various other bolts loose.

The engine now runs like a dream and sounds totally different.

I am now in the process of trying to recover monies paid for servicing etc. The Company are being "its sold with warranty", "we did service it", etc etc. But I now have trading standards involved and they pointed out that a criminal offence may have occurred.
All sounds a tad familiar, where (ish) in the country was the dealer that sold you the boat?
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Old 14 August 2014, 11:44   #8
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I was not intending on naming the dealer at this stage.

I purchased the boat from the West Country
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Old 14 August 2014, 15:54   #9
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I was not intending on naming the dealer at this stage.

I purchased the boat from the West Country

That's ok, just eliminates a few suspects. At least it's not Dan Cooper.


.....sh1t happens.......
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