Author Topic: tranny popping out of gear? (Read 5768 times)

HondaMan · « **Reply #25 on:** April 20, 2009, 06:38:58 PM »

Quote from: Industrial Cafe on April 19, 2009, 08:03:46 PM

HondaMan's brain is so full of useful information, he now looks like this with no helmet on.

That's why I'm writing it all into my book, so I won't have to try to remember it any more: then my helmet will fit and I can look it up if I need it.

mystic_1 · « **Reply #26 on:** April 20, 2009, 06:40:56 PM »

Are we talking about part #22 in the diagram below? I thought the shift drum is held in place by the neutral switch (25).

mystic_1

seat cover man · « **Reply #27 on:** April 20, 2009, 07:12:49 PM »

yes the plate i am refering to is part #22 in mistics diagram....so do i need to tighten it?

?

mystic_1 · « **Reply #28 on:** April 20, 2009, 07:38:48 PM »

Well, 22 is just a stopper arm that limits the travel of the shift arm (18). Mine always had some play. It rides on a spacer (23) so it'll never be perfectly tight. Make sure the bolt (31) is tight but don't over-crank it.

mystic_1

Industrial Cafe · « **Reply #29 on:** April 20, 2009, 08:16:06 PM »

i guess it is held in by the neutral switch, i dunno-
i thought about it after i typed it but got busy making a video and forgot i gave him bad info.

sorry dude

Industrial Cafe · « **Reply #30 on:** April 20, 2009, 08:20:42 PM »

OH! pull your neutral switch and see if its worn down some!

seat cover man · « **Reply #31 on:** April 20, 2009, 08:28:37 PM »

its cool its cool....bad news though....

....while waitin in between responses on here ive been cleanin caked up grease from around the sprocket on the engine and guess what i find?

JB Weld!!!!! and alot of it.....take a look!

seat cover man · « **Reply #32 on:** April 20, 2009, 08:29:25 PM »

and where is that located at?

? hence my name.....cb750 newbie....lol

mystic_1 · « **Reply #33 on:** April 20, 2009, 08:57:32 PM »

Quote from: cb750newbie on April 20, 2009, 08:28:37 PM

its cool its cool....bad news though........while waitin in between responses on here ive been cleanin caked up grease from around the sprocket on the engine and guess what i find? JB Weld!!!!! and alot of it.....take a look!

Yeah, that's the classic damage for CB750 cases, usually caused by a thrown chain or debris being pulled through the chain area.

If it's not leaking and you have no aluminum filings in your oil, you should be ok.

mystic_1

seat cover man · « **Reply #34 on:** April 20, 2009, 09:01:23 PM »

cool. so it couldnt be causing my problem then?

mystic_1 · « **Reply #35 on:** April 20, 2009, 09:10:55 PM »

I wouldn't think so.

mystic_1

Industrial Cafe · « **Reply #36 on:** April 20, 2009, 09:12:55 PM »

neutral switch is on the bottom of the case, under the shift drum

seat cover man · « **Reply #37 on:** April 21, 2009, 04:24:29 PM »

k ive located the neutral switch and disconnected the wire from it and removed the 10mm hex head bolt and its not comin out?

? any tricks or processes im forgetting or dont know about?

?

MCRider · « **Reply #38 on:** April 21, 2009, 04:32:35 PM »

Quote from: cb750newbie on April 21, 2009, 04:24:29 PM

k ive located the neutral switch and disconnected the wire from it and removed the 10mm hex head bolt and its not comin out?? any tricks or processes im forgetting or dont know about??

That's all there is holding it besides the friction of an O ring. You just gotta rub up agin it, and worry it out. It pulls straight out of the case.

When you get it to budge, I think you can slip a fine flat screwdriver under it and pry it out.

mystic_1 · « **Reply #39 on:** April 21, 2009, 04:41:26 PM »

The switch has two flats on the sides. Use pliers, open them up the their wider setting so that the jaws are flat on the sides of the switch, then pull down while twisting back and forth.

Keep in mind you're basically uncorking the bottom of your motor, so be prepared for oil to come out unless you've drained it already.

mystic_1

seat cover man · « **Reply #40 on:** April 21, 2009, 04:45:12 PM »

ok got it...here she is....and it still has springiness to it as well....how does she look?

MCRider · « **Reply #41 on:** April 21, 2009, 04:45:30 PM »

Quote from: mystic_1 on April 21, 2009, 04:41:26 PM

The switch has two flats on the sides. Use pliers, open them up the their wider setting so that the jaws are flat on the sides of the switch, then pull down while twisting back and forth.

Keep in mind you're basically uncorking the bottom of your motor, so be prepared for oil to come out unless you've drained it already.

mystic_1

Much better instructions, follow these not mine.

mystic_1 · « **Reply #42 on:** April 21, 2009, 04:53:57 PM »

Quote from: cb750newbie on April 21, 2009, 04:45:12 PM

how does she look?

Blurry!

Seriously though, looks OK to me. The reduced diameter at the end is the part that rides in the channel of the shift drum. Unless you see obvious signs of damage there you should be ok with that part.

At this point I'd put things back together except for the mission cover (shifter cover) and then work the mechanism several times by hand while rolling the rear wheel. Observe the shift arm and drub as the you shift. The shift drum should rotate from one position to the next without over-rotating or under rotating. If you see it over-rotate and then slip back to the detent position, or if it under-rotates and then slips forward to the detent position, then it's probably a worn shift arm. The hooks on the end of the arm can be worn, which can cause this problem.

See this thread for more info on this issue: http://forums.sohc4.net/index.php?topic=43341.0

mystic_1

HondaMan · « **Reply #43 on:** April 21, 2009, 07:51:17 PM »

Quote from: mystic_1 on April 20, 2009, 06:40:56 PM

Are we talking about part #22 in the diagram below? I thought the shift drum is held in place by the neutral switch (25).

mystic_1

In real life, the neutral shift plunger doubles as the detent for the shift drum. It is possible to pull the drum out a little if the parts on the side case are not all tight. This lets the forks misalign and the gear dogs drop out of their holes.

The case damage introduces another possibility: if the chain pushed far enough in, it could have hit and bent a shift fork. This could also cause the gears to not fully engage their dogs. The only cure there, though, is to pull the cases apart, and replace the fork(s) and possibly the cases (an expensive proposition!). Since the original pieces are gone, it would be difficult to make new fill-in plates there. I'm afraid this is a nasty situation... $:-\$

A spare engine might be the better bet? They can often be had for $100-$200, it seems.

Industrial Cafe · « **Reply #44 on:** April 21, 2009, 08:14:25 PM »

sounds like a real fist shaker.
you could pick up a motor (or a parts bike) on craigslist cheap...

use uship.com if you need to get a motor shipped. it was 300 bucks

for me from VA. to FL.

seat cover man · « **Reply #45 on:** April 21, 2009, 08:36:04 PM »

well i do have a 78 cb750k8 as well i do believe that i got with this bike......hmmmmm...thoughts anyone?

Industrial Cafe · « **Reply #46 on:** April 21, 2009, 09:06:15 PM »

I don't know if a K8 motor fits into a K1 bike
oh wait.
http://forums.sohc4.net/index.php?topic=48126.0

seat cover man · « **Reply #47 on:** April 22, 2009, 05:19:49 PM »

did they change anything at all on the shifting levers as they went....sicne my k1????if so i have a k8 i could rob one outa?

HondaMan · « **Reply #48 on:** April 22, 2009, 09:39:54 PM »

Quote from: cb750newbie on April 22, 2009, 05:19:49 PM

did they change anything at all on the shifting levers as they went....sicne my k1????if so i have a k8 i could rob one outa?

The best way to check this out: go to www.hondaparts-direct.com . They have all the parts fisches there, and you can compare part numbers to see if they changed from one model to the next. If the last 2 digits change one or two (like "010" or "030" instead of "000"), then they will interchange, both years. If the third digit changed (like "100") or any other digits changed, they won't interfit (that's "hondaese" for interchangeable).

You will be looking for gear shift forks: ask the "F" guys here and maybe "Eldar, Master of the K8 Thunder", as they know the later models better than I do. I'm good at the ones up to about 1976, don't have manuals past that.

Industrial Cafe · « **Reply #49 on:** April 23, 2009, 07:53:40 AM »

he is the master of the K8. I wonder where the thunder comes from, cause mine just sounds like a bike.

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Author Topic: tranny popping out of gear? (Read 5768 times)