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What "color" should the spark plug be? Morini Specifically

Italian made Franco Morini engines are the ultimate bicycle motor. Learn and share how to get the most out of morini motors.


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Old 02-14-2012, 07:08 PM
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Default What "color" should the spark plug be? Morini Specifically

Road my boxer around for the first time last night and today. Starting to run really well. Have not dealt with a 2-stroke in awhile so wanted to get some opinion on my plug. Probably 20-30 minutes total runtime and this is what the plug looks like.





have not really gone past half throttle yet.
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Old 02-14-2012, 11:50 PM
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Default Re: What "color" should the spark plug be? Morini Specifically

The tan color is right. White is too lean or too hot. Black is too rich or too cold of a plug range. It looks like your right on the money
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Old 02-15-2012, 12:34 AM
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Default Re: What "color" should the spark plug be? Morini Specifically

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The tan color is right. White is too lean or too hot. Black is too rich or too cold of a plug range. It looks like your right on the money
always a good feeling. Hopefully tomorrow I can get enough runs in that I can get a better idea of its tune. On a side note I am going to check the head bolts tomorrow. The manual says 12-14 nm or 9 ft lbs. Seems low or am I just really tired?
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Old 02-15-2012, 03:10 AM
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Default Re: What "color" should the spark plug be? Morini Specifically

If your studs are the 6mm ones that's the right torque. It's actually a fairly small size but it's been used for years on 50cc motors. A lot, mostly really, of the 66's have an 8mm stud.

Just come up to torque in stages and use some kind of repeating pattern to torque. I use a "Z" shaped pattern or you can use a "X" pattern.
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Old 02-16-2012, 03:21 PM
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Default Re: What "color" should the spark plug be? Morini Specifically

got a lot more riding on the bike today. the plug now looks like this.


Also Can't really go past half throttle once its up to speed. It cuts out. I think it is starving for fuel. I think it might just be because my tank wasn't venting but I ported out the holes in it. Didn't get a chance to test though. My mock shock broke and now I have a booboo on my leg.

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Old 02-16-2012, 10:39 PM
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Default Re: What "color" should the spark plug be? Morini Specifically

http://motorbicycling.com/showthread...ewpost&t=24873
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Old 02-16-2012, 11:37 PM
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Default Re: What "color" should the spark plug be? Morini Specifically

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thanks for the link. I really just posted photos because I am partially colorblind and really don't know what color I am looking at.
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Old 02-18-2012, 06:20 PM
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Default Re: What "color" should the spark plug be? Morini Specifically

2239968

post us a pic that shows the middle of the plug
when you feel the plug it should not feel oily at all but dry
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Old 02-18-2012, 09:39 PM
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Default Re: What "color" should the spark plug be? Morini Specifically

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2239968

post us a pic that shows the middle of the plug
when you feel the plug it should not feel oily at all but dry
of the electrode? I would definitely say the plug is dry. At first thought that was a bad thing but guess not. Tuesday when my shock comes I will be able to test the engine again. Hopefully the cutting out was the bike just starving for fuel at higher rpms. Everyone that hears the bike says it is pretty quite but when you are on it that is not the case. I can't really judge what the rpms are at by half throttle. rear sprocket is a 55 and the front a 10 with a 24" wheel. Should be capable of a lot faster then I have taken it. Pretty sure the gearing makes it capable of 36 if I am doing the math right but since it cuts out past half throttle I doubt its going faster then 20-25
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Old 02-19-2012, 08:05 PM
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Default Re: What "color" should the spark plug be? Morini Specifically

That Gray Color is not good. You are way too lean. Gray means you are cooking aluminum and it is becoming deposited on the tip of your plug. You are way hot !! You need to start out safe. That means.. Rich !! And then work your way towards the toasty brown color. Mix 25:1, put in the next fatten up your jetting until you get some 4 stroking.. Once you find this point, then put in the previous jet that had minimal 4 stroking mis firing which ever you want to call the misses. My factory Race Kawasaki recommends never leaner than 32:1. So.. To be safe, work towards this goal of 32:1 if you like. Bottom line here is to be safe and not damage engine. Running too rich you can fix more easily than a hole in the piston. A gray plug is telling you that you are headed towards a hole in the piston !! Fatten up now !! And then work your way towards a cleaner more powerful burn rate.. Enjoy the ride.
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