OutdoorKing Repair Forum Forums Restoring, Customising and Modifying Tech Talk Rebuild project HONDA GV400

Grumpy, that is fantastic, I will write these noises and symptoms down and take with me tomorrow, as we have 4 wonderful days at the block.

I will use these engines carefully and monitior engine noise, because if I dont the alternative is pushing a super 24 around.

Will report back on return.

Grumpy and Mark thank you for this post it has been excellent.
I have an old Masport Commercial Slasher mower that was given to me with a Honda GV400 motor that was in need of a little TLC.
I opened the motor up to find the main bushes had turned within the conrod. Luckily the crank was not damaged and neither was the conrod. I tried to purchase bushes but Honda do not sell them anymore only a Conrod with the material built into the Rod. I purchased a new Conrod from Sparesman in Thailand and have started to reassemble the motor.
I followed your timing alignments for all the cogs which worked perfectly. However I am bewildered with the internal u shaped lever in that which position it should be in when putting the casing back on. I realise it is something to do with the little weights and the slide piece but not sure what it is supposed to do?

Hi DDJJKK, welcome to Outdoorking. It is best to post a picture of the part when you ask a question like that, otherwise we have to guess. Here is the assembly diagram for the last bits to go into the crankcase:



If I were to guess, my guess would be that you are talking about the Governor Arm Shaft. If so, the diagram shows which way it goes on. Please post a picture so we can be sure we're all on the same wavelength though. Also, Mark may make a different, and probably better, guess than I have.

The governor has a pair of weights on the timing gear. As the engine speed increases the weights fly outward due to centrifugal force, and the levers on the weights push a sliding plunger along the shaft. The fork on the governor arm shaft is pushed by the sliding plunger, causing the governor arm shaft to rotate. Outside the crankcase, the far end of the governor arm shaft has the governor arm clamped to it. Thus the governor arm moves when the engine speeds up.

Spot on Grumpy thanks for the diagram. I will post a picture next time as well yes it was the Governor Arm Shaft and I have installed it incorrectly so will rectify on the weekend and then complete the rebuild. I will post a picture of the completed engine and Masport mower once completed hopefully as clear as Marks which have been excellent regards Dave

Grumpy and Mark thanks again for your post and help I now have a working Masport Walk Behind Slasher Mower with a like new at least internally Honda GV400 motor no smoke no noise just works.
Dave

Thanks for reporting back, Dave. A thread with an ending is much more useful in the archives than one that tapers off into a mystery - especially when the ending is successful.

I'll close this thread. If anyone needs to post to it, just send a PM to a moderator.