Join Date: Jan 2004
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Re: Bombardier 90cc performance
Water can get into the gas tank and/or carb from natural condensation. Especailly this time of year when temps are up/down all the time. The best way to eliminate condensation is a completely dry tank or a completely full tank. If a tank has 1/8-1/2 of gas in it, it will get "natural" condensation.
I've read that carb jets are suppose to be set by the dealer BEFORE the mini is released to the customer. Sometimes, this "final jet setting" gets missed (even for the best of dealers). I also read that many dealers are recommended to set the carbs on the rich side of the scale. For the 1st little while, it's better to run the carb in a little rich range compared to perfect setting. If the jets were perfect and you transported the mini to a dramatically lower altitude, it would run too lean. Thus, engine damage. A really good mechanic will ask the receiving customer what altitude they are, how much traveling they do, consider weather changes and set the carbs for that specific customer. Thus, each mini's carb is "customized" for each customer. Either customizing was a little off or they used the "factory rich recommendation" before handing you the keys.
If a carb is set too rich, it will smoke. If you also run pre-mix 50:1 for the 1st gas tank (as per many manuals recommend), the mini will smoke even more. With these "double smoke" items at the same time, the screen in the tail pipe WILL plug up. It always happens.
Now that your DS-90 is "back in action", its carb's jets are better set and you've probably finished that 50:1 premix for 1st tank burn-in, the muffler screen "should be good for life". Every spring, do remember to re-check this screen - just in case.
Note: Not trying to make your dealer sound really bad. He's a hero for finding the carb richness and screen plugged problem. But... If the carb was a 100% perfect on day 1, it might NOT have gotten a plugged screen. Probably still would have had water in the carb though.
Thanks for sharing the cause of the problems with your brand new DS-90. I'm glad you and your dealer finally got it off the launch pad. re: Now sitting on a rocket.