plowin-fire
ArboristSite Operative
Anyone have any reports of using a Walbro 12 HD carb on the 7900? I know a few of you on here have them. Suppose to be a bolt on job. Worth the expense?
You can't get it to 4stroke with the OEM carb? the porting i've read about hasn't needed a higher flowing carb...
maybe I'm wrong here, but as I understand it, if you fed the engine more air, you could feed it more gas too.
correct me if i'm wrong here but if your 4-stroking with the current carb it means you are already feeding it enough of both... Plus the saw is still going to be handy-capped by the limited coil...
If it's a race saw go for it... if it's a solid work saw I'd see if the stock carb would make it 4stroke... JMO...
Just change the jets in the current carb, should be simple and cheaper. If the dude porting advised it, doesn't he have an idea of what other carb???
Not real familiar with the 7900 carb, although I have a 7900 and run the frig out of it. I did change the jets in my 660 after a mild porting and muff mod..
I hope someone smarter than me chimes in, but as I understand it, you're four stroking if you're giving it too much gas for the amount of air that's in the engine at that time, feed it more air, you can feed it more gas. I really am not trying to be argumentative, I just have a vested interest in this question.
The ported 372s like a larger carb on them from a 385/390. I'm sure a 7900 would respond the same way.
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