View Full Version : No oil delivery when gear engaged and clutch pulled?

03-10-2003, 01:18 AM
Am I wrong when I say that the two oil pumps (gear pump and two-stroke oil pump) are driven by the gearbox?

My concern is during race start when you have gear engaged, clutch pulled and waiting for the red light to go away while reving the engine hard.
I donīt like the idea of not giving the engine any oil in this situation.<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/ohwell.gif ALT=":\">

03-10-2003, 05:14 AM

dunno about the gearbox oil pump - but ur correct - if the back wheel isn't going round then nor is the auotlube engine oil pump. (& all us street riding peeps leaving our bikes on tickover 4 ages to warm up properly LOL)

dont fret too much tho' coz on tickover (or even higher rpm) with the clutch pulled in the engine aint under a lot of load!

micah apriliaforum com
03-10-2003, 10:35 AM
I had never even thought about this...I suppose it may be true however. The engine oil pump is located in the rear of the tranny and may not spin without the bike in gear and under way. If this is so (I do not have a 250 here at the moment) it is the best reason yet to go to premix.

03-10-2003, 11:46 AM
Hi Micah,

Yeah the oil pump is driven by a plastic gear (another blindin' suzuki innovation ~ ever seen one melt? i so wish aprilia had gone to rotax 4 the motah) that attaches to the back of the pump & is driven by the output shaft.

Stu Jones
03-10-2003, 06:38 PM
Both oil pumps are driven off the same place and it meshes with the clutch gear that meshes with the crank end gear. In other words if the crank is turning the oil pumps are turning or something is broke!

03-11-2003, 01:17 AM
yes this is true.the only way to loose oil pump or gear pump drive is to make a dyno run & switch off the ignition.i have heard of TZ guys doing that.the clutch outer basket free wheels on the main trans shaft that is geared to the crank.the inner clutch basket is splined to the main trans shaft.so in effect everything is spinning accept the tire with the clutch pulled in.who the f:D :rolleyes: k started this tread? you may want to use that lump 3 feet above your ass before you type it.on an aprilia 250 this will NOT happen unless you do the above mentioned dyno wreckin sh8o t thing.remember that a dyno is just a tool,it is not GOD.you can use a #3 screw driver to take out a screw but that same tool you if used incorrectly can put you in the emergancy room.get my drift?