This question is going to sound incredibly stupid but what ,if any, affect would a larger size gas line have on fuel mileage?I know that the carbs can only use so much fuel at any time and are regulated by the floats and needle and seats but I am trying to find out why my sled has lost some of it's fuel range,mileage vs when it was newer.I used to have one of the sleds with the best mileage but now I find I'm one of the worst and I've tried searching for anything and everything from bad sticky bearings to track tension,you name it.
A few years ago I changed the original fuel lines with some bulk roll line my cousin had and come to find out it is actually larger,by only a fraction (1/4" vs 5mm stock) but I wonder if this would be enough to account for the ever so slight increase in fuel usage?I plan to buy some 5mm line this summer to replace the 1/4 " line on there now but was wondering if anyone had an opinion on this.
I clean the carbs spotless every fall so I know that there's no problems inside as far as I can tell but the internals have never been changed and by that I mean the brass is all original.The needles,jetting etc has all been in there from day one and I wonder also if it would be beneficial to replace this stuff with new?I know it's gasoline in there but you'd think it would tend to wear on the components year after year.
A few years ago I changed the original fuel lines with some bulk roll line my cousin had and come to find out it is actually larger,by only a fraction (1/4" vs 5mm stock) but I wonder if this would be enough to account for the ever so slight increase in fuel usage?I plan to buy some 5mm line this summer to replace the 1/4 " line on there now but was wondering if anyone had an opinion on this.
I clean the carbs spotless every fall so I know that there's no problems inside as far as I can tell but the internals have never been changed and by that I mean the brass is all original.The needles,jetting etc has all been in there from day one and I wonder also if it would be beneficial to replace this stuff with new?I know it's gasoline in there but you'd think it would tend to wear on the components year after year.
well, if it has alot of miles on it, three things can cause mileage troulbe assuming all other parts in sled are perfect. your reeds for one, they get weak, dont seal as good untill there is crankcase pressure to hold them tight. When this happens, the motor is not retaining mixture in the case to go to the cylinder. It pushes a little more mixture back into the carbs. Cdi box bad. The third is the nozzles and needle. If you imagined the needle hanging loosly in the hole of the nozzle, no big deal. Now pulse air in and out of the carb, 8500 times a minute. The needle is hitting the front and the back of the nozzle that many times with every pulse. Most riding is on the needles and pilot circuits. As the needle and nozzle wears away on each other, the gap increases adding fuel. This takes alot of miles to happen. To cure it, drop needles or replace nozzles and needles with new or low milage ones.
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X2
Bob
X2
Bob