40hp johnson rd-23 wont rev out in gear

[nikos73]

hi guys, small prob my motor idles perfect but will not rev out in gear, it only revs slightly at full throttle but in neutral revs normaly can anyone help me pls <br /><br />regards snapper head

 

[lark2004]

Re: 40hp johnson rd-23 wont rev out in gear

you may be dropping a cylinder.<br /><br />Have you checked for spark on both cylinders? Both should be able to jump a 1/4" to 1/2" gap with a bright blue snap. If not, then you probably have bad coils, dirty or mis-adjusted points, or maybe a wiring fault.<br /><br />This can be a problem with these old motors, luckily it is easily overcome.

 

[Chinewalker]

Re: 40hp johnson rd-23 wont rev out in gear

Could also be a blown headgasket - check for water on your plugs...<br />I am in agreement with Lark - you're more than likely dropping a cylinder in one way or another.<br />- Scott

 

[BoatBuoy]

Re: 40hp johnson rd-23 wont rev out in gear

Snapper, I'm curious. Did you discover the cause of the kick when shifting into reverse that you asked about here http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=037816;p=1#000005