texasfishingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
JerBear82, jcoolk, Codyboatguy, W E H, Huskey
115557 Registered Users
Top Posters(All Time)
TexDawg 103,103
hopalong 97,479
Pilothawk 80,960
John175☮ 79,357
Bigbob_FTW 74,649
JDavis7873 67,408
Derek 🐝 66,756
Mark Perry 63,061
Forum Statistics
Forums61
Topics1,151,810
Posts15,748,454
Members140,557
Most Online36,273
Jan 23rd, 2013
Print Thread
Rate Thread
Knocking noise in motor #14044029 06/26/21 06:42 PM
Joined: Feb 2006
Posts: 848
K
kirbydog Offline OP
Pro Angler
OP Offline
Pro Angler
K
Joined: Feb 2006
Posts: 848
I have a 2004 Johnson 2 stroke 40 hp. It starts right up and idles smoothly and runs great until I get to about
2/3 full throttle and then I get a knocking noise out of the engine. If I go down on rpm's to below 2/3 the knocking goes away.

Any ideas on what this could be. I changed the lower and no meta shavings in the oil at all.

Any help would be appreciated.

Re: Knocking noise in motor [Re: kirbydog] #14045433 06/28/21 03:43 PM
Joined: Feb 2006
Posts: 848
K
kirbydog Offline OP
Pro Angler
OP Offline
Pro Angler
K
Joined: Feb 2006
Posts: 848
Anybody have an idea of what is causing this-I'm assuming something is seriously wrong with the motor but was
hoping I could get an idea of what the cause is.

Re: Knocking noise in motor [Re: kirbydog] #14045441 06/28/21 03:50 PM
Joined: Jan 2010
Posts: 2,421
M
me and the boys Offline
Extreme Angler
Offline
Extreme Angler
M
Joined: Jan 2010
Posts: 2,421
Knocking is never good. Start with a compression test.

Re: Knocking noise in motor [Re: kirbydog] #14045596 06/28/21 06:17 PM
Joined: Jan 2004
Posts: 2,359
R
rb7764 Offline
Extreme Angler
Offline
Extreme Angler
R
Joined: Jan 2004
Posts: 2,359
could be many things. can you post a video?

Re: Knocking noise in motor [Re: kirbydog] #14045847 06/28/21 10:06 PM
Joined: Jul 2010
Posts: 1,074
B
boatman025 Offline
Extreme Angler
Offline
Extreme Angler
B
Joined: Jul 2010
Posts: 1,074
could have a tooth off a gear


Hughes Marine
3855 Osage Lane
Wylie ,Texas
Previous Thread
Index
Next Thread

© 1998-2019 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
Powered by UBB.threads™ PHP Forum Software 7.7.3