Question about Poulan Pro Chain Saw 46cc 20"
I understand why lean jetting and things like that can cause overheating, but why can an improperly sized carb on the small side cause overheating issues? I read that the volume of mixture in the cylinder shouldn't change in the cylinder, so that kinda kills my theory that you are simply increasing the amount of mixture for added cooling... although that may be negated by the extra power and heat from burning more mixture. Anyone know for sure?
A carburettor is chosen by the volume of the venturi on it. A small carburettor will not be able to supply a rich enough mixture. Evaporating gasoline, just like alcohol rubbed on your skin, takes out heat as it turns to vapour (that's evaporative cooling). If there isn't enough gasoline evaporating in the engine, the engine overheats. So, choose a carburettor that is at least big enough for the engine it feeds. As engine displacement is fixed, what changes is the amount of gas the carburettor can feed, hence, a small carburettor supplies a too little volume of a too lean mix.
Posted on Mar 11, 2009
a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Repairman (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Nov 17, 2014 | Electrical Supplies
Oct 06, 2013 | 1990 Mitsubishi Mighty Max
Apr 15, 2013 | 2001 KTM EXC 300
Oct 17, 2012 | Yamaha Motorcycles
Jul 25, 2010 | Husqvarna Zero Turn Mower Z5426
Jun 04, 2010 | 2000 Harley Davidson XL 1200 C Sportster...
Apr 09, 2010 | 1983 Suzuki GSX 1100 E
Nov 12, 2009 | 2005 Suzuki Boulevard C50T
Nov 01, 2009 | 2005 Honda CRF 450 R
Nov 10, 2008 | 2007 HM CRE F450R
340 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: