2 Stroke Oil Pump Settings.

mrbluesbox · Scooby Slapper Joined: 14 Sep 2006 Karma :

Can anyone tell me how i can check if the oil pump on my Derbi GPR 125 is set up right.
im getting quite a bit of smoke from it (really bad first thing in the morning) and i think it might be putting pumping in a bit too much oil but im unsure of how to check.

Thanks

Gaz.
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MarJay · But it's British! Joined: 15 Sep 2003 Karma :

c-m · World Chat Champion Joined: 12 May 2006 Karma :

completely different bike, but my KH125 has little markings on the pump that are actually balancing marks.
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Marci · Brolly Dolly Joined: 01 Sep 2005 Karma :

Generally, you pop the pump cover off, and adjust two locknut style adjusters (similar to throttle cable adjusters). There should be a marking cast into the engine casing, and a marking on the pump itself. Hold throttle fully open, the two marks should align. That's it. Well, that's how it's been done on all my bikes... for yours, see here: https://homepage.ntlworld.com/j.cowell4/gpr.pdf (GPR125 workshop manual - 6.2Mb)

Only time to worry about excessive (bluish) smoke really is MOT day... as it'll fail... hence never take a 2 stroke for an MOT without riding it around for a good hour or so first to warm it up... if you MOT a 2 stroke from a coldstart, even a perfectly setup bike, the majority can fail quite easily.

Excessive white smoke is a much different matter... usually a water problem (either water in fuel, blown headgasket, or just condensation in the exhaust from being stored outside overnight)
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mrbluesbox · Scooby Slapper Joined: 14 Sep 2006 Karma :

yeah the bike seems to be running pretty well - no power loss or anything - theres a bit of a stutter as it goes into the powerband about 6k but i can live with that for the time being - just a bit annoying in the morning when i get to deal with a big ass cloud in the back garden Smile

Ill check the pump for markings and things when i get in and can get the cover off:)
Ill let ya know and post some pix if i need to .

ta

Gaz
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