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Messages - StevieWonder

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1
CB750 / Re: CB750K GREASING REAR SWINGING ARM
« on: March 24, 2020, 05:12:05 PM »
Thank you both, will do as described.

2
CB750 / CB750K GREASING REAR SWINGING ARM
« on: March 22, 2020, 10:25:36 PM »
Despite my age, I'm not familiar with grease points. Having 'borrowed' a grease gun from my Dad and read the Owner's Manual, How much grease should be applied to the two swinging arm joints? I've pushed 3-squirts of the gun into each, Is that too much? What happens if you put too much in? Where will it come out? I don't want to grease the rear tyre!!!

When there are no more questions, then you will have the answer.

3
CB750 / Re: CAN'T FIND NEUTRAL WHEN HOT
« on: March 17, 2020, 03:34:33 PM »
I'm using 10W40 Rock oil, Gamma. It a mineral oil that are apparently better for 'running in' an engine after rebuild - as my top end was.

4
CB750 / Re: CAN'T FIND NEUTRAL WHEN HOT
« on: March 17, 2020, 12:49:56 PM »
Many thanks to all for helping me move this forward.  I have re-adjusted the clutch (yes Julie, the Owner's Manual has a small error! See later.) with the help of description from K2-K6, the lever is now in a more like 7 o'clock position and cable slack almost completely taken out. Thought we'd fixed it, as on the centre stand when hot, gears and neutral selected easily, but noted rear wheel still turning when in-gear with clutch disengaged (clutch lever pulled), which could be stopped with a boot. However when off the stand, couldn't get neutral  :-\ :-\

gp_st3 has described my very similar issue perfectly. Has clearly gone to some lengths with fewer and non-dimpled steel plates. Be grateful for a lead to the source of these. CMS site picture looks smooth. DSS doesn't have picture but can order them in.

So for what it's worth, the way I see it: There is a clutch issue, not a slip problem but drag or not fully disengaging. This puts torque into the gearbox, not enough to drive the bike forward, but places cogs under tension, resulting in difficulty pulling them apart and finding neutral.

With a wet (running in oil) clutch one might expect more drag when cold (I use mineral oil - synthetic should be smoother?). So I need to inspect the clutch, maybe some of the clutch plates are buckled or perhaps the lifting mechanism has inadequate range and can be improved? Whilst it's out might as well do a full service and include friction plates and springs.

Owner's Manual Page 58. "Loosen the clutch lifter adjusting screw lock nut '2', turn the clutch adjusting screw in the counterclockwise direction 'B' (correct so far) until a slight resistance is felt (wrong: until it loosens). From this position, turn the adjusting screw in the clockwise direction 'A' 1/4~1/2 turn. Tighten the lock nut '2'." Correct.

What fun!

5
CB750 / Re: CAN'T FIND NEUTRAL WHEN HOT
« on: March 16, 2020, 04:40:32 PM »
Thanks K2-K6, I have quite recently set the clutch in a similar manner to how you described, by using the procedure in the Owners Manual. I will do again using your description and in the hope that I can get it closer to 7 o'clock.

Gave it a run out today, before any adjustment, only about 10-miles, with air temp much cooler than I usually ride it. Interestingly, selecting neutral was noticeably easier. :-\ :-\

Will update when I had a chance to make adjustments as you describe.

Regards
Steve

6
CB750 / Re: CAN'T FIND NEUTRAL WHEN HOT
« on: March 15, 2020, 05:34:14 PM »
Yes Julie, only completed some 750 miles since top end overhaul, but no idea what the total mileage is or if the clutch has ever been changed.

K2-K6, Haven't ever notice any clutch slip, not as smooth as it might be and range from first bite to fully engaged could be wider. Am yet to give it a handful of throttle or pass 5,000 revs. Attached photo shows clutch level, with handle bar lever untouched. Would have liked to see it more in a 7 o'clock position.

All comments appreciated.

Steve

7
CB750 / Re: CAN'T FIND NEUTRAL WHEN HOT
« on: March 14, 2020, 04:21:11 PM »
Thanks both. I have tried rocking the bike when stopped, but it rarely helps. I'll try snicking it in when coming to a stop, but would like it to be able to select it when stopped. Was never this bad on previous bikes.

8
CB750 / CAN'T FIND NEUTRAL WHEN HOT
« on: March 14, 2020, 01:21:01 PM »
Hi All,

It is usually very difficult if not impossible to select neutral on my 1970 CB750 K0 when hot or properly up to temperature. No problem when cold or warming up. Clutch seems fine, correct play before de-engaging, no drag when fully depressed. Could this be a selector problem or am I looking at a gearbox overhaul?

All advice appreciated.

9
CB750 / Re: 20/50
« on: December 18, 2019, 05:53:40 PM »
I read that mineral oil is best to 'run in' an engine after rebuild. So since mine was rebuilt, it's been running on 'gamma 10W40 mineral motorcycle oil' by ROCK OIL.

10
CB750 / Re: Removal of 1970 - 1971 Steering Locks
« on: December 14, 2019, 05:46:16 PM »
Glad you have raised the subject as I too have a steering lock that the replacement ignition key doesn't fit. Not sure, but I understand from other posts on here that the lock can be removed if you have the key and keys can be ordered against the number stamped on the lock. Trouble is, you can't read the lock number without a key. Hence, others have drilled the lock out and ordered a new lock and key. You may also be able to find matching steering lock and ignition lock (same key operation). Difficult to see how a lock can be drilled out with any finess (given both its awkward location - not a problem for you - and that you are not drilling a solid piece, but a group of loosely assembled parts). Hopefully others can provide details and experienced advice.

11
CB750 / Re: 1970 CB750 BATTERY WARNING DECAL
« on: December 14, 2019, 12:12:42 PM »
Thanks again Guys. 'the-chauffeur's' picture of the helmet holder is particularly revealing, my 1970 USA frame number 103****, doesn't have the hook to hold a helmet on the rear seat support - yet Piki's site offers: HONDA CB750 FOUR K0 WARNING DECALS KIT that includes two yellow 'HELMET HOLDER' labels. I guess different markets and changes in the production run produced some versions that had the hook. Seems I don't need the HELMET HOLDER decal then. Perhaps the battery label goes on the inner rear mudguard (too big to sit anywhere else), but not sure if it should be there at all on this edition.

12
CB750 / Re: 1970 CB750 BATTERY WARNING DECAL
« on: December 13, 2019, 08:06:04 PM »
Thanks for the comments so far. There are a number of ebay adverts offering decals for the K0, but are they correct. For example, some decal sets include a yellow "HELMET HOLDER" decal - I don't hink it has a helmet holder, unless it's the hook on the seat catch - would be grateful for confirmation or correction. As with the battery warning sticker it seems difficult to get an authorative reference.

13
CB750 / Re: 1970 CB750 BATTERY WARNING DECAL
« on: December 12, 2019, 02:59:15 PM »
Thanks, know this site well, usually very helpful, but can't see any appropriate 'Mark' listed on the relevant diagrams.

14
CB750 / 1970 CB750 BATTERY WARNING DECAL
« on: December 12, 2019, 11:20:10 AM »
I don't think the USA 1970 CB750 came with a battrery warning label and that they first appeared on the K1. I could be wrong - there's always a first time  ;). If so, perhaps one of you knowledgeable Gents or Ladies would identify the correct design and location (Inner rear mudguard, top of frame or elsewhere).

15
CB750 / Re: CB750 - 1970 - Top Yoke - Advice Needed
« on: November 27, 2019, 06:14:39 PM »
I understand it is not uncommon (possibly due to heaving 500 lbs onto centre stand through leverage of wide bars?). My original yoke was cracked and replaced with replica on purchase from DS. A contact was going to attempt an alloy weld repair of the original. I don't know if that was successful.

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