Quote:
Originally Posted by DaBlue1
Several things caught my attention;
1.) No center stand
2.) Muzzy exhaust
3.) No airbox when you bought it, "No filters, not even pods. They left the boots from the front side of the air box on the back side of the carbs and put mesh on them to make a sad looking filter."
4.) cuts off after high revs
5.) hint that owner tried to make bike into something it is not
6.) it wasn't running right at all until you put the air box back in.
By chance did the previous owner race the bike? And did he put in smaller or larger main jets?
Too small main jets would prevent the bike from revving too much past 6k. 6k rpm in 6th gear is about 51 mph (indicated) w/ 14/45 sprockets.
Too large of main jets would make it bog at high rpms and make the idle drop below it's set point. The engine also won't respond when the throttle is snapped open.
Putting stock jets (#105) back in just to be sure probably would solve your problem or at least give you a good starting point going forward. #110 main jets would be the biggest I would put with a full Muzzy and airbox
Just something to look into.
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@DaBlue1 just made a huge point here.
He's pointing out that you may not have a fuel starvation problem. Instead you may be suffering from
too much fuel.
If you and your mechanic friend re-installed a stock airbox without reversing/reducing any carb modifications (larger main jets, aftermarket needles or a bunch of washers under stock needles that has to be done to properly fuel an engine with a Muzzy and pod filters) then you may have a very simple case of an engine that is drowning in fuel (over-rich) under certain circumstances. If it is going way over-rich on decel from 50 or 60 mph it would behave the same as you've described in your initial post. It would put out it's own fire with too much fuel (anything lower than about 9.0/1 air/fuel ratio will snuff out an engine). After this happens there would probably be a period of time during which the engine is still too flooded to start (spark plugs very wet with fuel). After the fuel has had time to evaporate enough the bike would start back up again.
Did you reduce the richness of the carb settings when you put the stock airbox back on the bike? An EX-250 with a Muzzy and Pod-Filters can handle a hell of a lot more fuel than one with a Muzzy and a stock airbox.