Topic: split cases because of gear shifting issues --> don't find anything wrong

[HondaNorway]

I split the cases on my 750K yesterday because of gearshifting issues / neutral between random gears. I thought it was the shifting forks that was in bad shape, but i can't see any damage on them or the drum/gears. Though i haven't measured the forks with a micro meter yet, but i think they are in good shape.

Any suggestions?  


-Stian

[Shoeboxjoe]

I have the same issue after a complete rebuild although it's only happened maybe 4-5 times in 400 miles worth of riding, i've just been living with it. Everything looked fine during the inspection so I'm curious to see what could be the possible cause (although im not rebuilding it again unless I do some crazy 836cc engine with rods and lightened crank or something  )

[Leanier]

My bike had a similar issue, and popped out of gear alot.  Didnt have any visible wear on anything, ended up getting a full used tranny on ebay.  Turned out that it was the actual shift drum.  after much trial and error...

[Shoeboxjoe]

Now that you mention it, i think i did bend some parts of the shift drum while removing it (although i bent them back)... i should take another look at that linkage.

[HondaNorway]

I have the same issue after a complete rebuild although it's only happened maybe 4-5 times in 400 miles worth of riding, i've just been living with it. Everything looked fine during the inspection so I'm curious to see what could be the possible cause (although im not rebuilding it again unless I do some crazy 836cc engine with rods and lightened crank or something   )

Good to hear that i'm not the only one that doesnt find anything wrong  

Here are some pictures of the forks and gear shifting mechanism and a movie:

http://www.youtube.com/watch?v=7Sr9g_bxb90

[scottly]

Look at the center of the detent wheel in the last pic; there appears to be damage at the edge of the axle it rides on. Perhaps the wheel was installed in the wrong slot on the end of the shift drum?

Edit: just watched the video; the wheel looks quite worn.

[scunny]

+1 on the sloppy wheel.

[HondaNorway]

Look at the center of the detent wheel in the last pic; there appears to be damage at the edge of the axle it rides on. Perhaps the wheel was installed in the wrong slot on the end of the shift drum?

Edit: just watched the video; the wheel looks quite worn.

Thanks for the reply, guys! I really appreciate it   
I had a suspicion that the wheel was in bad shape, but not that it was crucial for all the problems with the gearing. I will buy a new one.  From what i have been reading here on the forum, it's very common with worned out shift forks, so i was 100% sure that was the problem 

-Stian 

[scottly]

You were not specific about your shifting problems; have you had troubles with the transmission "popping" out of gear, under load? If so, this might put more strain on the wheel. The usual cause of this is worn dogs on the gears.

[scunny]

the "sloppy wheel" sure wont help positive gear selection. any wear on the selector cam that wheel rides on ?

[camelman]

Before you buy anything, check your clutch drum.  The clutch disc tangs will wear detents into the clutch basket fingers.  This will result in poor clutch control and multiple false neutrals.  I just went through this on a CB450, and filed the tangs smooth before reassembling.  The difference was amazing.  Silky smooth clutch engagement, no more false neutrals, and the clutch reaction was finally predictable.

Camelman

[HondaNorway]

Before you buy anything, check your clutch drum.  The clutch disc tangs will wear detents into the clutch basket fingers.  This will result in poor clutch control and multiple false neutrals.  I just went through this on a CB450, and filed the tangs smooth before reassembling.  The difference was amazing.  Silky smooth clutch engagement, no more false neutrals, and the clutch reaction was finally predictable.

Camelman

Is the clutch disc tangs  the tracks where the clutch plates sit? Maybe you could tell me witch part you think of by looking on this technical diagram:

http://www.cmsnl.com/honda-cb750-four-k4-usa_model482/partslist/E++09.html



-Stian 

[HondaNorway]

the "sloppy wheel" sure wont help positive gear selection. any wear on the selector cam that wheel rides on ?

I don't know what selector cam is (rookie   ), could you tell me by looking at this diagram? :

http://www.cmsnl.com/honda-cb750-four-k4-usa_model482/partslist/E++13.html

-Stian  

[HondaNorway]

bump