notch Posted March 12, 2013 Share Posted March 12, 2013 Anyone know the correct Walbro metering lever height for a PA125 engine? I'm running lean on the top end, and the lever is flush with the surround at present. To richen it up I need to raise the lever, or decrease the pop off pressure? Quote Link to comment Share on other sites More sharing options...
Neilzy Posted March 12, 2013 Share Posted March 12, 2013 Walbro have a gauge which checks the hight of the needle pop off is set by the spring pressure PM me your number i could lend you one if you want..... Neilzy Quote Link to comment Share on other sites More sharing options...
morgy Posted March 12, 2013 Share Posted March 12, 2013 Neilzy Are you still flying????? Quote Link to comment Share on other sites More sharing options...
Neilzy Posted March 12, 2013 Share Posted March 12, 2013 Will be when the weather improves!!!!!!!! Quote Link to comment Share on other sites More sharing options...
paulg18 Posted May 9, 2015 Share Posted May 9, 2015 I know this is an old thread now, but I have just serviced my Walbro Wg8 fitted a Polini Thor 110 and the new metering lever supplied in the kit was preset to a height of 1.7 mm which is the same as that on the Walbro gauge. Running it now it is clearly too lean and momentarily stalls when going from idle to full power, so does anyone else know what height is best for this engine. There are a few figures quoted on the net but I cannot find a figure that relates to the Wg8 on a Polini 110. Quote Link to comment Share on other sites More sharing options...
notch Posted May 10, 2015 Author Share Posted May 10, 2015 The lever height should be flush with the surrounding area (what the W tool specifies) - I tried different heights and they did not make that much difference to be honest. I ended up getting some jewellers files and extending the size of the main jet. I also found a whole lot of crud in the valve part of the main jet. If you are having issues when you press the throttle from idle to full power, it means your L screw needs opening (counter-clockwise) - try 1/4 of a turn. Don't underestimate the effect of the L screw - it makes the whole range of throttle richer or leaner - even the top end. If you are still running lean at high throttle openings, then the most likely culprits are an air leak in the crankcase or crap in your carb. Quote Link to comment Share on other sites More sharing options...
bholleran Posted May 10, 2015 Share Posted May 10, 2015 Also remember the height needs to be adjusted with the gasket on. Quote Link to comment Share on other sites More sharing options...
notch Posted May 10, 2015 Author Share Posted May 10, 2015 Really? That makes it about 0.5-1mm higher than flush then... Quote Link to comment Share on other sites More sharing options...
Neilzy Posted May 10, 2015 Share Posted May 10, 2015 Have you checked pop off pressure if you have fitted new needle and spring that will also be affected which would alter mixture Quote Link to comment Share on other sites More sharing options...
notch Posted May 10, 2015 Author Share Posted May 10, 2015 Manual here: http://www.walbro.com/media/21936/SERVICEMANUAL.pdf Does not seem to mention using the gauge with gasket? More info here: http://www.wind-drifter.com/technical/wg8walbro.php Quote Link to comment Share on other sites More sharing options...
paulg18 Posted May 10, 2015 Share Posted May 10, 2015 Have ordered a pop off gauge and waiting delivery, the required pressure I have seen quoted is 17.5 to 19.0 psi does this sound correct. Quote Link to comment Share on other sites More sharing options...
Neilzy Posted May 10, 2015 Share Posted May 10, 2015 I have the gauge and always use it without the gasket, I've also always set pop off at around 12 to 14 psi and found that perfect however that is on a Moster it could be different for a Polini. Quote Link to comment Share on other sites More sharing options...
notch Posted May 11, 2015 Author Share Posted May 11, 2015 yep set around 15psi on my wg8... Quote Link to comment Share on other sites More sharing options...
miniwing2 Posted May 12, 2015 Share Posted May 12, 2015 I have had mine set above flush with the body that way i no it pops off.would have thought the L screw would have the final say? Quote Link to comment Share on other sites More sharing options...
Xplorer Posted December 19, 2020 Share Posted December 19, 2020 This article will explain the lever height setting on the WH8 carb which is independent of which motor you use it on. https://www.southwestairsports.com/ppgtechinfo/top80/hrservicenotes/walbrowg8/ml_height-variations.htm Note that the Moster uses a different carb. The WG8 has no High mixture adjustment screw. Instead, it has a High Jet. These are used on most small engines up to approx 130cc. The bigger engines typically use the WB32 or WB27 which has a High mixture adjusting screw. Quote Link to comment Share on other sites More sharing options...
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