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Old 07-02-2007, 09:41 PM
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Default My motor is eating up reed valves

My 95 200 hp Johnson is eating up carbon fiber reeds.
OK maybe it's not eating them but you know what I mean,on the first set the #1 piston came out slightly melted and pushed back through the wrong way and it was only the two reeds on the ends that were damaged (Pre. ignition if I am not mistaken).I changed them out on Sat. hoping it was just the old reeds and on Sun.I heard the same noise at the same RPM and it think it is happening again, I don't think it's the timing and I would lean towed the power pack but I also need to know how the timing runes, does it run off a magnetic pickup in other words when I put the magnet back on that fell off the flywheel during my rebuild last year and if I didn't put it in exactly in the same spot could and would it do this?


Thank you for your help Tom
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Old 07-03-2007, 07:27 AM
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Default RE: My motor is eating up reed valves

The outer magnets that sometimes come loose on the flywheel do not affect timing. The round inner magnet does. Timing is set using a timing light and running the motor ingear underload above 5000 rpm to be accurate. The pointer has to be set and adjusted to read TDC according to the factory service manual before using the light.

The problem with "plastic" reeds is that they are easily damaged, and work best with performance engines, not ones used day to day in recreational use. One backfire, one "lean spit" on starting, etc. may damage them. The factory metal reeds are practically industructable today. It's best to replace them.
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Old 07-04-2007, 12:49 PM
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Default RE: My motor is eating up reed valves

Thank you for your reply your description of how the timing works made sense to me thank you. As for the reeds the rebuild is why I put them in,one of the metal ones got ingested in my power head and that made it time for a rebuild,and for that reason I will keep the C.F. reeds.I also troll a lot and like the low smooth RPM they give me.


Thanks Tom
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Old 07-05-2007, 01:51 PM
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Default Re: My motor is eating up reed valves

Greetings,

A1 you mentioned "lean spit" is that when you start the moter and it coughs and dies, the start again and all is OK?
My 2003 OX66 250 does this when first started, Replaced the O@ sensor last year, set the throttle sync, and TPS.
Also, after running in no wake zone, or trolling, then accelerating, I will loose RPMs and lights go dim, while adjusting the trim.
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Old 07-05-2007, 05:31 PM
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Default Re: My motor is eating up reed valves

stpabr,

Start a new thread since your post has nothing to do with the '9 200 Johnson outboard.
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