old yami 2 stroke

frankr2994 · 06-21-2011, 05:37 AM

cool thank you. does anyone by chance have a pic with a blaster exhaust or a banshee exhaust installed? and i'm not worried about blowing the top end. amsoil dominator oil does wonders.. just have to block that stupid oil injection sh!t off. i had actually cold seized my blaster engine 4 times in one day and it didn't hurt it lol. the quad was not stock it was very fast and it was colder than 10 out. 75 mph flat out accross the fields would give to much cooling to that air cooled engine and it would lock the tires up. wait 5 minutes kick it back over and you were good to go again. i've had the top end off to check it out (could not believe that it wasn't destroyed) and after 2 seasons of drag racing it i sold the complete engine on ebay and the guy loved it and had no problems with it.

Tonka329 · 06-21-2011, 04:29 PM

I am an Amoil fan also. but, with the injection pump, the more throttle you give it, the more oil the cylinder gets to keep lubed. Premix wont do that. I blocked off the pump on my Yamaha snowmobile. It is working so far!! KNOCK, KNOCK!

GMB74 · 06-21-2011, 07:47 PM

The oil injection system varies the oil:fuel ratio between 1:150 and 1:300 depending on engine load. This is fine with the stock engine and tuning which is governed at max 12 MPH and about 2700 RPM. Since you want to run at higher RPM's for higher speed, it probably would be best to premix to insure proper lubrication. A synthetic oil would be preferable to a standard petroleum oil. Just disconnect the hoses, plug the oil injection fitting on the carb, remove the oil tank and the pump on the engine. Leave the inner half of the gearcase cover, as it helps retain the crankshaft oil seal.
Pix of Banshee exhaust setups:

Tonka329 · 06-21-2011, 07:58 PM

Hey GMB. What is the power difference than stock??

GMB74 · 06-22-2011, 04:34 AM

I haven't done the exhaust mod. These are some images I pulled off this site when I was toying with the idea. Do a search, maybe you can find the original poster and ask them. Maybe it was Tikicart?

frankr2994 · 06-27-2011, 07:22 PM

hey thanks for the exhaust pics. i have a kx250 fmf pipe an old one that i think i will fab up.. and about the oil injection putting it in a 150 to 1... wtf. no it doesn't. most oil injection systems dump it in at about 20 to 1. good for no blowing the top end but also usually to much oil. amsoil dominator at 50:1 works great. and it doesn't have to vary it...the more gas goes in the more oil. its always going to dump it in at 50:1 you would be surprised to know that a properly tuned 2 stroke ( correct jetting down to the outside temp) running that oil at 50:1 does not smoke.. oh i also got myself 2 stock yamaha blaster carbs and one kx250 carb. i believe it to be a 34mm all of them mikuni's also brought down my quad tires. i'm going to see if my front hubs off the blaster may go onto the cart. it would have front brakes then :) i'm going at all this because i disabled the governor and the cart just runs out of sh!t it doesn't rev out to get to its top speed.

The kid · 07-24-2011, 10:30 AM

Can you pm me on how that fmf pipe goes ive been wondering about this

yamarancher · 02-23-2012, 10:48 PM

I use amsoil dominator 50:1 & really like it, no smoke at all, and i run it hard.

06-21-2011, 05:37 AM	#11
frankr2994 Not Yet Wild Join Date: Oct 2010 Posts: 40	Re: old yami 2 stroke cool thank you. does anyone by chance have a pic with a blaster exhaust or a banshee exhaust installed? and i'm not worried about blowing the top end. amsoil dominator oil does wonders.. just have to block that stupid oil injection sh!t off. i had actually cold seized my blaster engine 4 times in one day and it didn't hurt it lol. the quad was not stock it was very fast and it was colder than 10 out. 75 mph flat out accross the fields would give to much cooling to that air cooled engine and it would lock the tires up. wait 5 minutes kick it back over and you were good to go again. i've had the top end off to check it out (could not believe that it wasn't destroyed) and after 2 seasons of drag racing it i sold the complete engine on ebay and the guy loved it and had no problems with it.
frankr2994 Not Yet Wild Join Date: Oct 2010 Posts: 40

06-21-2011, 04:29 PM	#12
Tonka329 Smoov az a gravy sammich Join Date: Oct 2008 Location: Limestone, Illinois Posts: 3,462	Re: old yami 2 stroke I am an Amoil fan also. but, with the injection pump, the more throttle you give it, the more oil the cylinder gets to keep lubed. Premix wont do that. I blocked off the pump on my Yamaha snowmobile. It is working so far!! KNOCK, KNOCK!

06-21-2011, 07:58 PM	#14
Tonka329 Smoov az a gravy sammich Join Date: Oct 2008 Location: Limestone, Illinois Posts: 3,462	Re: old yami 2 stroke Hey GMB. What is the power difference than stock??

06-22-2011, 04:34 AM	#15
GMB74 Gone Wild Join Date: Jun 2009 Location: Heluvabump,VT Posts: 623	Re: old yami 2 stroke I haven't done the exhaust mod. These are some images I pulled off this site when I was toying with the idea. Do a search, maybe you can find the original poster and ask them. Maybe it was Tikicart?

06-27-2011, 07:22 PM	#16
frankr2994 Not Yet Wild Join Date: Oct 2010 Posts: 40	Re: old yami 2 stroke hey thanks for the exhaust pics. i have a kx250 fmf pipe an old one that i think i will fab up.. and about the oil injection putting it in a 150 to 1... wtf. no it doesn't. most oil injection systems dump it in at about 20 to 1. good for no blowing the top end but also usually to much oil. amsoil dominator at 50:1 works great. and it doesn't have to vary it...the more gas goes in the more oil. its always going to dump it in at 50:1 you would be surprised to know that a properly tuned 2 stroke ( correct jetting down to the outside temp) running that oil at 50:1 does not smoke.. oh i also got myself 2 stock yamaha blaster carbs and one kx250 carb. i believe it to be a 34mm all of them mikuni's also brought down my quad tires. i'm going to see if my front hubs off the blaster may go onto the cart. it would have front brakes then :) i'm going at all this because i disabled the governor and the cart just runs out of sh!t it doesn't rev out to get to its top speed.
frankr2994 Not Yet Wild Join Date: Oct 2010 Posts: 40

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07-24-2011, 10:30 AM	#17
The kid Getting Wild Join Date: Jul 2011 Posts: 88	Re: old yami 2 stroke Can you pm me on how that fmf pipe goes ive been wondering about this
The kid Getting Wild Join Date: Jul 2011 Posts: 88

02-23-2012, 10:48 PM	#18
yamarancher Gone Wild Join Date: Nov 2011 Posts: 232	Re: old yami 2 stroke I use amsoil dominator 50:1 & really like it, no smoke at all, and i run it hard.
yamarancher Gone Wild Join Date: Nov 2011 Posts: 232

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