Pre mixing oil with fuel.. please help :)

[Bike_craze1]

Got a 2 stroke 125 mito evo 2.. noob question!

Is pre-mixing better used in fuel also? just been informed, is this true? it's got a seperate oil tank but it dosen't seem ta use much oil? any help is appreciated
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Yamaha R125 - Cagiva Mito 125 - Honda CBR 600
CBT passed: 22/07/08 Bike Theory passed: 28/03/09
Bike Test passed: 15/04/09

[Kickstart]

Hi

Only real advantage of pre mixing is that you can do away with the pump.

Pre mix will mean that when you have the throttle shut from speed the engine is getting negligible oil, and likely to slightly compensate for that you will be running far more oil than necessary on full throttle.

If you do run pre mix you will need to blank off the oil feed to the intake, jet the carb richer and probably remove the pump (which might not appreciate being run without oil, and seizing the pump is a possibility).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[P.]

[SnowyTupwood]

I run all my two strokes on pre mix, the race bikes need more oil than the pump can deliver at full chat. If you spend an awful lot of time flat out, and do trackdays etc, then I'd seriously think about it.

But if you ride on the road, pre-mix is a pain in the butt to be honest, you have to carry oil with you, and you should be running that bike on a decent fully synthetic which a lot of petrol stations don't carry.

If you think it isn't using much oil a check on the oil pump settings might be in order.

30-1 on a decent fully synthetic oil is about the right ratio if you decide to go this route. Don't take any notice of the old wives tale that less oil = more power, it's been proved otherwise that as much oil as the bike will burn makes more power.

Hope this helps
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RD350LC/YPVS Race Bike and enough bits to start another one! - RD350YPVS Race Bike - TZR250 Race Bike - ZX9R - ZZR1400 project - DRZ400SM - RD400 - TS100 - TY250 - More info @ www.waveracing.co.uk or www.ypmrc.co.uk

[Blau Zedong]

[Walloper]

I have a chainsaw and a hedge trimmer that use 2 stroke premix. It is a pig to measure the tiny amount to fill the small tanks. (Less than 0.25L) And to add insult to injury they do not use the same ratios...

If it has a lube tank stick to that.

The specification could possibly give an indication of oil consumption/mile to check the engine is getting enough oil.
If the pump system is blocked or the pump worn you would need to know.
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W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

[SnowyTupwood]