2talltim Posted March 30, 2016 Report Share Posted March 30, 2016 (edited) 18 minutes ago, cobravenom452 said: In 10w40 or 20w40 as long as your using an oil that ends in w40 is good. The 40 is the weight of the oil, the first number is how cold it is good down to. Example 10w40 is good down to 10 degrees, and 20w40 is good down to 20 degrees. That is the rating for viscosity of the oil down to a certain temp. The weight doesn't change though. NO no no. The first number is the oil viscosity when its cold its "W" weight or "winter" weight. It's is not the temperature. So a 10W30 will have a 10 weight oil viscosity when cold and a 30 weight oil viscosity at operating temperature (or hot) There is a trick here; the oil doesn't actually get thicker (turn from 10 weight to 30 weight) as it gets hotter. What is actually happening is that when the oil is cold, it has the viscosity of a cold 10 weight oil. as it gets hotter, it doesn't get thin as fast as a 10W oil would; by the time it is up to temperature, it has the viscosity of a hot 30 weight oil. Edited March 30, 2016 by 2talltim 1 Quote Link to comment Share on other sites More sharing options...
JackImpact Posted March 30, 2016 Author Report Share Posted March 30, 2016 What you are describing sounds like a lean condition, too much gas will make it boggy. More than likely the carbs need rebuilt and the entire intake track needs checked for cracks and air leaks. The bike is old enough that every rubber piece on/in carbs will need replaced. To try troubleshooting with out first rebuilding the carbs will be a nightmare. These carbs are newer mikuni. Like really new. If you watch one of the videos I posted you can hear what it does when I rip the throttle. Maybe Boggs is the better term. Quote Link to comment Share on other sites More sharing options...
cobravenom452 Posted March 30, 2016 Report Share Posted March 30, 2016 I was trying to put it in laymen terms without trying to write several paragraphs. Quote Link to comment Share on other sites More sharing options...
JackImpact Posted March 30, 2016 Author Report Share Posted March 30, 2016 So one of the covers for the valve is broken and I am calling it at this point. Thank you for the help everyone. Quote Link to comment Share on other sites More sharing options...
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