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Post by ozo on Jun 7, 2017 15:46:29 GMT -5
What ratio oil/fuel is used in a 2 cycle 50cc scooter without oil injection?
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Post by ryan_ott on Jun 7, 2017 16:03:37 GMT -5
This subject varies greatly depending on a bone stock motor or a full out race build machine. Anywhere between 32:1 to 50:1 if perfectly acceptable. I run 32:1 on all machines. Keep in mind if going to premix you will have to upjet to make up for the percentage of oil now in your fuel.
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Post by AtariGuy on Jun 7, 2017 17:41:56 GMT -5
Depends how many mosquitos you need to fog for... just kidding
I'm chiming in with 40:1 mix on my 47mm hoca kit
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Post by gsx600racer on Jun 7, 2017 18:13:11 GMT -5
This subject varies greatly depending on a bone stock motor or a full out race build machine. Anywhere between 32:1 to 50:1 if perfectly acceptable. I run 32:1 on all machines. Keep in mind if going to premix you will have to upjet to make up for the percentage of oil now in your fuel. +1 ^^^^^^ Oil quality also makes a difference. Synthetic, Synthetic/Blend, Ect.... |
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Post by ozo on Jun 7, 2017 18:22:30 GMT -5
I am going to mix it with a mix bottle because I am buying a gallon rather than the 2.4 oz. containers due to the extreme price difference. So 40:1 is in the middle area between 32:1 and 50:1 which sounds good to me. The replacement carb I am buying for my previously oil injected Honda Express should not need a jet change according to the carb seller, link below. EDIT: Pennzoil marine xlf extended life formula outboard 2-cycle synthetic blend oil www.ebay.com/itm/232356355500?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT |
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Oil Ratio
Jun 7, 2017 18:42:19 GMT -5
via mobile
Post by ryan_ott on Jun 7, 2017 18:42:19 GMT -5
I would steer away from the marine two-stroke oil that is a different classification plus some of it is biodegradable to go in the ocean. Not really meant for a AC scooter. There is plenty of synthetic choices out there. I personally use Amsoil dominator and have used belray SI-7 in the past.
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Post by gsx600racer on Jun 7, 2017 19:14:14 GMT -5
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Oil Ratio
Jun 7, 2017 19:20:56 GMT -5
via mobile
Post by tsimi on Jun 7, 2017 19:20:56 GMT -5
Running 40:1 on my red Jog setup.
Using Castrol Power1 Racing 2T oil.
21mm PHBG carburetor with 37/96 (Summer) and 38or40/98 (Winter) jetting.
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Post by ozo on Jun 7, 2017 20:24:27 GMT -5
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Oil Ratio
Jun 7, 2017 21:05:55 GMT -5
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Post by AtariGuy on Jun 7, 2017 21:05:55 GMT -5
spot on, can't go wrong with it. Pig, spaz, and overse might need 2B though... |
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Post by ozo on Jun 8, 2017 8:15:22 GMT -5
Why does 2 cycle oil not indicate weight like 4 cycle oil?
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Post by 90GTVert on Jun 8, 2017 8:41:02 GMT -5
Why does 2 cycle oil not indicate weight like 4 cycle oil? Possibly because it's somewhat irrelevant what the viscosity is. As long as it will flow through injector lines or mix well with fuel, it doesn't really matter. The AMSOil I use is really thick stuff. I've also used Maxxima in the past that worked well and it was almost like pouring water. 4T motor oils have to be moved through the engine in passages of varying sizes and need to be able to be a suitable viscosity in different conditions. 4T oils are more directly applied, for lack of a better term ATM, and they are more subject to heat buildup because they typically are stored in the engine and pumped round and round the hot engine. 2T oils are sort of a use once and destroy. They go in with the fuel or from a pump and they get burned and are smoked out. There's a constant fresh supply that's stored remotely, not in the hot engine. |
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Post by ozo on Jun 8, 2017 9:33:40 GMT -5
Why does 2 cycle oil not indicate weight like 4 cycle oil? Possibly because it's somewhat irrelevant what the viscosity is. As long as it will flow through injector lines or mix well with fuel, it doesn't really matter. The AMSOil I use is really thick stuff. I've also used Maxxima in the past that worked well and it was almost like pouring water. 4T motor oils have to be moved through the engine in passages of varying sizes and need to be able to be a suitable viscosity in different conditions. 4T oils are more directly applied, for lack of a better term ATM, and they are more subject to heat buildup because they typically are stored in the engine and pumped round and round the hot engine. 2T oils are sort of a use once and destroy. They go in with the fuel or from a pump and they get burned and are smoked out. There's a constant fresh supply that's stored remotely, not in the hot engine. Seems like from your explanation I could use 4t oil in my 2t or would it not mix well? |
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Post by 90GTVert on Jun 8, 2017 11:00:27 GMT -5
Seems like from your explanation I could use 4t oil in my 2t or would it not mix well? Please don't do that, unless you hate your engine. Just because viscosity is not of a primary importance for 2T oils, that doesn't mean they aren't specially formulated. 2T oil has a tough job. |
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Oil Ratio
Jun 9, 2017 8:31:50 GMT -5
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Post by AtariGuy on Jun 9, 2017 8:31:50 GMT -5
I hate to actually be that idiot, but i did it to a cateye chinese pocket bike long long ago. This was when i was a dumbass kid though... by the end of the tank it wouldn't run to save its life, pretty sure i wrecked the diaphragm carb and did even more wreckage inside the engine. If i still had it, i'd tear it apart now to see what 4t oil did to it...
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