What could be causing my motorcycle engine to bog down at high speeds?

Answer by  GJC7 (79)

Lack of air flow many times will reduce engine effectiveness. Most engines are factory set in regards to carburation and jetting. Minor adjustments in exhaust, intake and jetting can make huge difference in performance. Lastly, elevation can cause engine to bog down or lose power. Another easy fix can be re-gearing can provide higher speeds or better acceleration.

Answer by  Gerald68 (7)

The most probable cause is that the Engine is not receiving enough fuel.Check if the Fuel filter is clogged up or if there is any sludge on the tank, if so, replace your fuel filter and/or clean the tank.

Answer by  D25 (14)

This is likely at high rpms or high throttle input rather than just high speeds. You may check the fuel air/mixture if you have a bike using a carb. If your bike has fuel injection dirty injectors may be an issue. In either case, verifying that you have clean gas running through and a clean fuel filter.

Answer by  Amber40 (24961)

I would give the bike a tune up. Check all the filter ad pull the plugs too make sure they are firing and the gaps are right.

Answer by  ipk (53)

You motorcycle could be bogging down at full throttle or high speeds for a few reasons. Fisrt is the bike carburated or fuel injected. If it is carburated then the air fuel mixture could be off. Or the float in the carburator could be stuck.

Answer by  Amber40 (24961)

Well I would guess that if it only occurs at high speed then it is either fuel or ignition related. The fuel system might be restricted cause a lack of fuel need under load. The ignition may have a misfire only occuring at high rpm.

Answer by  eyeguy (3760)

Your bike is most likely suffering from a vacuum leak. check the hose and fittings around the breather as well as search for leaks with carb cleaner.

Answer by  Philc (50)

if it is carburated then I would start there and go to the high speed coil on the stator if the carbs are good or it is a fuel injected motor.

Answer by  doigerooney (66)

Wind can have a serious impact on a motorcycle's speed, slowing the object in motion down, while making the engine work harder to maintain speeds. If you have a sportbike, these conditions arent as prevalent as, say, a chopper, because they have better streamlining.