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Old 13 December 2013, 15:35   #1
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Tohatsu 5hp wont start!

Right guys,

I've just bought a pristine looking Tohatsu 5hp 2-stroke, and the bloody thing won't start! The tank was empty so I've given it a fill of freshly mixed 2-stroke 100:1 mix. I'm getting a spark if I check against the casing and the spark plug comes out wet.

The spark isn't exactly bright, but having never tested this way before, I'm not sure what I should be getting!

Anything obvious for me to check?

Cheers

Si
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Old 13 December 2013, 16:41   #2
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I'll take it off your hands!

These things are bullet-proof. Check from the fuel tank, there's probably an inline fuel filter. Assuming you've checked its clean as a whistle, move onto the vent. With my Mariner 4hp, there's a vent valve on the fuel tank cap, unscrew it.

The spark, you could extract, dry it off and check the gap. Wire brush it, if it has carbon build up. Check the HT lead to it, that it makes contact with the spark plug.

Finally, assuming there's no safety cord to it, put it past 'start' on the throttle in case you've flooded it and try again. Keep us posted.

Only other thing I can think of is to strip the carb down. Straight forward and one of the things I would do on a 'new engine to me'.
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Old 13 December 2013, 16:45   #3
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haha! you bloody wont! i've been after one for ages!

Vent screw open, and fuel coming nicely down the line, but havent checked a filter yet! The plug is nice and clean, but I havent checked the gap! will have a look online to see what the gap should be and try again!

Never stripped a carb down before so that will be interesting if i need to do it!

Will have a look again tomorrow in the day light!

Cheers

Si
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Old 13 December 2013, 17:12   #4
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Nice find. I can't help with the problem. FYI - the mix ratio is 50:1 - not what ails you but might help in the future if you run it at WOT as an aux.

M5B | Tohatsu Australia

PS: I'd try a NEW plug. You need one as a spare anyway.
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Old 13 December 2013, 17:19   #5
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This is going to sound like a stupid question, but will the likes of halfords stock the right plug?
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Old 13 December 2013, 17:30   #6
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Quote:
Originally Posted by SimonCh View Post
This is going to sound like a stupid question, but will the likes of halfords stock the right plug?
Cough!

Try Autosave (Lang Stracht), or Autoparts (Inverurie)... just watch their faces when you tell 'em it's for a Twatsoo!

Halfords are a waste of time, (apart from their Professional tools) which are the dog's danglies.
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Old 13 December 2013, 17:30   #7
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Quote:
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This is going to sound like a stupid question, but will the likes of halfords stock the right plug?
I have no idea, but the correct plug type (an NGK BPR7HS-10 or equivalent I think) should be marked in the lower interior case. I bought mine off ebay for a couple of quid.

Your manual: http://www.tohatsu.co.jp/en/boat/pro...03-11068-4.pdf
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Old 13 December 2013, 17:35   #8
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Thanks all!

I'm boycotting autosave on riverside drive after they screwed me over with some filters.... Long story! Could take a run to the lang stracht though!

Thanks again, I'm not a TOTAL mong, honest!

Will call in the morning to see if they have a plug!

Si
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Old 14 December 2013, 05:23   #9
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Have you tried removing the spark plug & putting half a tea spoon of fuel into the cylinder replacing plug then see if it will start then or at least fire up for a few seconds Often if an engine has been stood a while it may just need it to fire & for it to pull fuel through especialy with a single cylinder . As Spartacus said these engines are just about bulliet proof.
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Old 14 December 2013, 06:17   #10
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If you struggle to get the plug Simon... I have a spare one (it's used but in good nick). You can give me a shout hombre!

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