Sophomore Rider
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Post by CopperDeer on Mar 5, 2014 1:38:04 GMT -5
I've had some of my Derbi GP1 50cc 2T taken apart for various things over the winter and haven't run it in 4-6 months. Any advice on bleeding air out of the oil pump & lines and ensuring adequate lubrication for the first few starts?
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Post by carasdad on Mar 5, 2014 6:35:46 GMT -5
I've had some of my Derbi GP1 50cc 2T taken apart for various things over the winter and haven't run it in 4-6 months. Any advice on bleeding air out of the oil pump & lines and ensuring adequate lubrication for the first few starts? Easy..open the bleeder screw on the pump itself until oil flows from it. DO NOT start and run the engine until oil is going into the Carb line. No amount of 'cranking' will get the oil up there as it takes a long time to get from the oil pump up to the engine. Staring it that way will give you a "dry Run' engine for several miles and of course seize the engine. What we do is..bleed the pump and line... Pull the line from the carb..Then run the engine on 32:1 premix until we see oil bubbling from the carbs oil inlet line. We drain the tank and put one quart of the 32:1 premix in it and run until we see oil oozing from the carb inlet hose. Then fill the tank up full with straight gas. Yes it will still be partially a premix in the tank..but will be less than 100:1 once the tank is topped off. Once done..you are ready to ride using your oil reservoir as usual. Not bleeding the oil pump has caused more seized engines for 'do it yourself BBK installers' than I can count on my fingers and toes..  Don't risk that expensive new top end..  Glenn p.s. DO NOT forget to drain the carb and fuels lines..or the premix gas will not get into the engine right away! DO NOT just let the engine idle as the pump barely works at idle and it would take all day to finish bleeding the pump. Ride it gently and rev the engine a few times until you see oil bubbling from the disconnected oil line.. |
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Sophomore Rider
Currently Offline
Posts: 201
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Joined: Feb 27, 2013 2:23:40 GMT -5
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Post by CopperDeer on Mar 5, 2014 8:57:05 GMT -5
Awesome instructions thanks Glenn the man! I figured premix was the safest bet to start with but unsure how to make sure when the injection is working right. Good point about draining the carb bowl first to get premix in there right away. We'll see how it goes today, much appreciated.
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Post by skuttadawg on Mar 14, 2014 21:36:12 GMT -5
Too much oil can surprising not be good as one would think . If you want to use oil injector I would replace the stock pump with a Mikuni pump . Premix is a hassle but a safer sure bet . Here is oil pump adjustment tips oil pump which was written by a guru and great buddy |
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