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Discussion Starter #1
If I am maintaining a constant speed of say 30 mph in 1st or 2nd gear, and I whack it open the bike accelerates normally for the first second, then there is a slight lurch forward for a split second and then it continues accelerating as normal. I'm thinking possibly the chain is loose. Could that be it?
 

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maybe its you going forward, not the bike. chain could be slipping on the rear sproket causing the bike to momentarily stop accelerting?
 

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i got to thinking about this and maybe its not what i said. If the chain start to slip on the sproket under hard acceleration, it would most likely slip for more than a slip second. maybe timeing? clogged carb jets?
 

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Sounds like the fuel mixture is off a little bit when the carbs get into the mains. They could be opening too much too soon or not enough. Any mods? Is the bike from the Rockies originally?
 

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Check your chain. I had a F2 which did the same thing the chain was loose and also the sprocket was worn causing the chain to slip on hard accel.
 

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If by lurch forward you mean that the bike momentarily looses power and then gains it back, another thing to check would be the vacuum hoses. My bike had a crimp on the vacuum hose that goes from one carb to the petcock to open the fuel. After I made it run with nice organic curves, part of the stumble went away. The rest went away after I found out that the vent on the tank was getting pinched by the seat. Easy things to check if the other posts didn't get at your problem.
 

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Discussion Starter #8
Thanks everyone. I'm going to check all these things in the morning.
 
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