I've been working on my 1977 puch maxi these past few days. Yesterday I cleaned out the gas tank with Muriatic Acid (I couldn't get phosphuric acid anywhere). It worked well, but it took me forever to flush out all of the rust. I was running water through the tank for hours before it was running clear. Finally all the rust had washed out, so I filled the tank with 1 bottle of dry gas and a gallon of gas and oil. I let it sit for a little and then flushed this out. Then I filled it up with regular gas oil. It worked great! When I look into the tank with a flashlight, it is perfectly clean. For everyones information I let it sit with straight muriatic acid for 2 hours. I also left my petcock in, because I couldn't plug the hole any other way. The acid completely ate through the plastic mesh filter in the petcock...so I installed an inline fuel filter, no big deal.
Now the real question. Again 1977 puch maxi with a biturbo. My top speed with airbox and filter is 27. Without the filter or the box my top speed is probably 34.
The airbox and filter are very clean, as is the carb. I don't feel like taking the carb apart to find the jet size because I just took a shower and finally I don't smell like gas any more! I'll do it later. Does anyone have any ways that they get rid of the gas smell on their hands? It takes me two showers before its gone.
Obviously the bike is running rich and I should decrease the main jet size. But I had some thoughts....
If I decrease the jet size will the bike run as fast as it does with the airbox and filter removed?
And I was thinking about taking a dremel and enlarging the air intake port a little. Do you think this would help at all?
Their is a guy a town away who has a bunch of puch parts. I'm gonna stop by his house and try and pick up a few smaller ones