Bonneville America Forums Forums Technical Forums General Tech 03 Bogging Out At 2500 3000 RPM

03 America, Out of the blue the bike has started to Bogg down in every gear @ 2500 3000 rpm only when you in that zone, Idles perfect, starts with no problems, any suggestions to what may be causing this.

Thanks for all your help.
Stewart

Can you tell us what's been done to the bike? Anything recent like pulling the snorkels? Sounds like the bike is running lean. Mine used to bog at 2500 right after I pulled the snorkels under the seat. The only way to get rid of it was to richen the mains or put the snorkels back in.

If yours started suddenly check for a cracked air box allowing more air into the engine (has the bike backfired recently)? Also check the intake rubbers between the air box and the carb for cracks or deterioration.

One other thing, there is a vent hose that vents the carb bowls. It starts between the carbs and ends up in behind the engine and is right beside the tank vent. If this hose is oriented a certain way, it can cause a syphoning action in the float bowls that restricts fuel flow through the main jets (less atmospheric pressure pushing down on the fuel in the bowls) causing a bog at speed, crosswinds and even when trying to pass tractor trailers. Ask me how I know!!!

Thanks Gregger for quick reply, nothing been done to the bike recently, as I say everything was ok up until now, then it started to act up.

Does it come back to life above 3000rpm? If not I would look for a fuel issue, clogged filter, clogged petcock, blocked vent, etc...

Yip, once you blow past the 3000rpm it runs normal.

Have you looked at the diaphram in the top of the carbs?

yup diaphrams, float levels, vaccum lines, maybe coils.

I doubt float level as it would run out of gas and not recover, also doubt coils.

Solved....... Problem turned out being wire running to coil had a little corrosion on it, cleaned all the wire connections the bike now runs great.

Thanks for everyones help.