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Post by pxguru on Apr 7, 2013 8:57:41 GMT
That now looks like it isnt about to seize up! ;D
Th plug is still not getting hot enough though. Try it with a B6 next time.
To check the mixture of a 2 stroke plug fully you need to be able to see right into inside the plug to the bottom. Try taking the pic to show this next time.
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Post by sime66 on Apr 8, 2013 8:16:53 GMT
Not seizing again up is definitely a bonus! I think you guys might have saved me a lot of agro and expense. I’ve leant a lot from this, thanks. I had a more thorough read-up on plug chopping and reading the results yesterday; I see why the period of full throttle (in third), to be just using main jet under load, and instant isolating of plug is important, and that you need to read right down inside, not just the tip. It’s all good learning, even the mistakes. Need a bit of practice actually doing it with the engine screaming though. I used a B6 all last year, now I'm using a B7. I've got plenty of both. Shame you two (nik & guru) don't agree. I'm going to be setting up again with the new carb soon anyway, so I'll look into and understand it more thoroughly then. Joey also mentioned using a hotter plug for running in, then going up a number, and for long rallies. Until the carb change I'm just putting some more miles on my piston, and some more accurate plug chops to be safe until then.
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Post by kru251 on Apr 8, 2013 21:04:45 GMT
I found with two strokes (I used to have a Kawasaki KR1 motorcycle; 250cc making 55bhp) when they were working absolutely spot-on............. they were just about to blow up! If it was slightly rich/not quite there we were OK. I swopped that Kr1 for my first L********a Li 150 when the Kwacker was just going so well (120mph on the level by sat nav with my 16.5 stone aboard) that I just knew it wouldn't last!!!!!! What an engine note from a yowling twin. By the way, no two people will ever agree really on which plug is the definitive 'right' one etc and to be honest, some engines work best with one plug and others with another grade yet on paper the engines are the same spec. Then we get down to jet sizes for the weather. When my mate was racing 250cc YPM's (Yamaha Past Masters) he would tape of the radiator when it got a bit cooler, say if the wind got up a few knots, and I'd have to change jets when it even clouded over just a bit!!!! Just find what works for you/your scoot............... and enjoy.
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Post by joey on Apr 8, 2013 22:23:37 GMT
Just find what works for you/your scoot............... and enjoy. I'm with him on that one
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Post by pxguru on Apr 9, 2013 4:18:39 GMT
There are so many variables that you can't just fit a B6 in a standard and a B7 in a kitted scoot and a B8 in an animal. You are going about it exactly the right way. If you learn how to read a 2 stroke plug (nothing like the same as a for a four stroke !) then you can fit the correct plug and correct jet to suit your engine. As Kru says the point just before it blows up is the fastest but scooters have a habit of going just past this point when you are farthest from home ;D
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Post by sime66 on Apr 9, 2013 6:35:36 GMT
Thanks everyone, I don’t really want to be so spot-on I’m about to blow. I think what I thought was a good plug in the past was pretty/too lean, which is why, combined with other factors (leaks?, worn/stuck rings?, very cold?, cleaning the air filter?) I ultimately seized (it did feel good to me last year until it went bang). I mainly want to buzz it up and down Cornwall, and know it will get me to and from the rallies with all my stuff loaded up. I’m often waiting for others anyway, and I don’t want to be waiting for the truck. When I get my 24/24 sorted, I’ll use what I’ve learned from this to try to set it up well, with those factors in mind. It wasn’t really about top speed; I’ve got plenty for me (it goes off the speedo), some extra grunt, laden down on long hills, would be good! I had a good read about plug selection too last night. I won’t list out what you all already know, but I understand that better now too. And that reading the plug properly is the key to getting it right. On to the next job………
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