300XS won't deliver full power; returns no codes/faults. Can barely get 4500 RPMS.

[kostas74]

Forgot to mention. I had a motor a few months ago give me fits. Similar issues as your describing. This motor had ingested the yellow flywheel plug that covers the nut. It was stuck in #6 Rees block partially opening one Reed, and blocking the flow of air to that cyl.check your flywheel and pull the throttle body, you can stick your whole arm in there and check .

After reading this post i found out that my missing yellow plastic flywheel plug got stuck in the reeds opening!!!
Tomorrow i am going to stick my hand in there (hope it fits) and get it out.
Do you think that this is cutting some power from the engine?
Thanks anyway!(i forgot to mention that i have a 200 Opti)

[kostas74]

1)OOPS!!!
2)In this picture you can see that the cover was being tortured from the reedvalves!

[ghost28]

Funny thing....I had a 300x come to me one time after being at two other shops that couldnt figure out why the motor ran ok sometimes and then sometimes ral like crap no power and wouldnt idle...after about 15 minutes of looking around i peer down into the throttle body opening and see something red....pull the intake and low and behold there is a small bottle of LOCTITE stuck in the reeds...had been in there a while and the prior shops kept testing and testing and testing so the reeds were a mess....saw one other with the yellow plug stuck in the reeds....funny what happens to our motors....

[merctech5591]

Mother merc wants us to reinstall the yellow plug on the nut but I always toss them in the garbage.Never seen a bottle of lock tight .. That a first.