Pre-mix ratios for QR50 and PW50

[aaj]

Gday guys,

Just got hold of a PW50 for one of my kids and it joins the XR100, XR70 and QR50 in the shed.

The PW50's oil injection is disconnected and Yammy runs on pre-mix.

Heres the questions,

1. From everyones no doubt considerable experience with this subject if I use a good oil what would be a safe ratio for both the QR50 and the PW50 ?

2. The QR50 still has the oil injection hooked up, to disconnect it, is it only a matter plugging the supply line from the onboard reservoir or is there something else I should do?

Thanks

[aaj]

aaj - Got on the net and find out for yourself ?

OK did that, lots and lots of info out there on this subject, know all about go kart mixes, KX250 mixtures, pocket bike mixtures, residual oil in the crankcase, correct procedure for jetting, 40 different points of view on all of the above not to mention the 'best' oil, dyno to prove whats best etc etc etc :BH :bzr

Tell you what, I'm going to start with a good oil from the bike shop and mix it at 32:1, take the kids out let em at it for a while and then check what the plug looks like.

[gazza2003au]

i personally would start @ 32:1 if u foul a plug than move out to 35:1 foul another plug than move out to 38:1 etc... keep in mind a fouled plug is alot cheaper than rebuilding the motor!

[gazza2003au]

whipper snippers run @ 25:1, racing pocket bikes (50cc) run @ 25:1....

[gazza2003au]

george would u rather keep on building top ends at your expense or would u rather change foul plugs and keep your motor untill u work out the proper oil/fuel mix?

[WAYNEKER]

aaj, my lad use to run a qr50 on avgas for the sand drags.

No1, you need to remove the pump and block off the hole, get a 3/4 rubber block off from a auto parts store, ( car heater hose is 3/4).
No2 , if you just disconnect the hose it pumps out air and oil from the crank pressure.
NO3, if you run at any less than 50.1 , you will carbon up the exhaust likes theres no tommorow, trust me on this one !!!!
As i said we had a hot one that screamed on avgas , you can do heaps to these motors

[Fat Boy]

G'Day aaj,

I run my son's pw50 on 32:1 as recomended from my dealer, I didn't trust the premix as they do have problems.

Thanx,

Fat Boy

[gazza2003au]

george i donno what fuel you use but my husky runs on 50:1 max! yes you run more lean because u run racing fuel who is going to stick high octane gas in a peewee 50

[gazza2003au]

you said your mate runs 80:1 "pump gas" very hard to believe! thats 125mls of oil to 10L of fuel