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Old 25-07-2017, 10:53 AM   #1
Toad
 
Country: UK
Location: Ongar
Boat name: Who The Hell
Boat make: Zapcat
Engines: Tohatsu 50hp 2 Stroke
Cruising area: Mallorca

Join Date: Jul 2017
Location: Ongar
Posts: 2
2 Stroke Racing Oil & Killing Plugs

Morning All,

This is my first post so please be nice.

I purchased a Zapcat fairly recent, its my first 2 stroke, outboard and racing RIB so I'm bit of a numpty, hence I'm after a little advice on a couple of points:

- What is the best oil brand, type, etc I should purchase? I've seen a few threads on this subject but wanted to check if I should be looking for something specific for a Cat?

- After 2/3 days use the engine keeps misfiring, I replace the plugs and its all ok again. The plugs themeselves don't seem in bad condition but it does solve the problem again for a few days. I'm sure the mixture is correct. Why am I killing plugs so quickly or could there be another issue I'm missing? btw - it has been serviced recently but still the same issue.

Any advice from the boating gods will be much appreciated
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Old 25-07-2017, 11:47 PM   #2
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Country: Scotland
Location: Isle of Lewis
Occupation: student
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
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Posts: 348
I use Yamaha 2 stroke oil, but quicksilver is good too and I've heard good things about RockOil who sponsor some zapcats
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Old 29-07-2017, 02:14 PM   #3
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We've been selling the Merc 2-stroke race oil to people racing Thundercats for ages. Only had good feedback. We always keep plenty in stock
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Old 29-07-2017, 03:23 PM   #4
Toad
 
Country: UK
Location: Ongar
Boat name: Who The Hell
Boat make: Zapcat
Engines: Tohatsu 50hp 2 Stroke
Cruising area: Mallorca

Join Date: Jul 2017
Location: Ongar
Posts: 2
Quote:
Originally Posted by roflhat View Post
I use Yamaha 2 stroke oil, but quicksilver is good too and I've heard good things about RockOil who sponsor some zapcats
Many thanks.

Do you have problems with the engine misfiring after a few uses or having to replace plugs on a regular basis?
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Old 31-07-2017, 08:54 AM   #5
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: student
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 348
Quote:
Originally Posted by Toad View Post
Many thanks.

Do you have problems with the engine misfiring after a few uses or having to replace plugs on a regular basis?
I was having those problems when I ran it at 32:1 oil mixture, which was recommended by someone in the US for the 70ces. Since then I've gone to 40:1 which works fine and doesn't foul any more. 32:1 is probably fine for racing use but if you're using the engine for general use with some time spent at low speed and idle it just fouls the plugs
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