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Topics - StevieWonder

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CB750 / K0 CORRECT MIRRORS
« on: November 05, 2019, 08:52:34 PM »
When did the handle bar mirrors change from Acorn nut adjustment to friction swivel ball? The Parts Catalogue indicates that all K0s had Acorn nuts, but maybe it was only the early models? Mine is a May 1970, Frame No 1036***.

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CB750 / K0 CORRECT DATE OF MANUFACTURE
« on: October 15, 2019, 06:41:18 PM »
Can anyone please help me identify when my bike was manufactured. Unfortunately the VIN plate on the steering head has been removed - maybe for respray, It's a K0 with frame number 10369**. I think it would be around May 1970. Perhaps there is a listing of frame numbers and dates out there or I'd be very grateful, if someone with a similar frame number and intact VIN would advise.

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CB750 / TORQUEING REAR AXLE
« on: October 11, 2019, 01:35:55 PM »
Does anyone know, if the rear axle bolt can be torqued up without removing silencers/mufflers #3 and #4?

The 24 mm axle nut has a torque setting of 58 – 72 Ft/Lbs, which in itself calls for significant leverage and more than an open ended spanner.

However, I have found that with the silencers supported and the pillion foot peg/ silencer support withdrawn the additional space around the rear axle nut is still insufficient to fit a socket or a crowfoot spanner/wrench and attach the torque wrench.

As the axle nut must be regularly accessed to make drive chain adjustments, surely there is a technique to set the torque with silencers in place?

4
CB750 / Correct Front Wheel Hub K0
« on: October 04, 2019, 02:30:17 PM »
I’m hoping that my CB750 K0 has the correct front wheel fitted.

According to Service Bulletin #26 the width of the front wheel hub was reduced by 4mm for the K1.

My front hub is 65mm when measured across the outside of the top flanges as shown in the attached photo.

If I have the correct wider hub, then a similar measurement on a K1, k2 etc. should be 69mm.

Grateful if anyone would confirm.

5
CB750 / CB750 K0 Front Sprocket Case Protector
« on: October 01, 2019, 03:48:49 PM »
According to John Wyatt, my 1970 CB750 K0 (Engine Number 1036****) should be fitted with a case protector (Part No: 11353 300 010) around the front drive sprocket, but it isn’t. Apparently, the front sprocket cover was modified at E1026144 to accept the case protector. I’m thinking my sprocket cover may be from an earlier bike, though I can’t find any pictures to show how they differ. Grateful if any of you could enlighten me.

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CB750 / Oil Tank Connections
« on: September 17, 2019, 03:27:47 PM »
Hi, On my 1970 CB750 K0 I’m confused about two connections to the oil tank, these are the smaller connections at the top and back. Removing the tool tray reveals the top connection, which points up and is bent back over. The other is hidden below and points down. They are shown on a diagram of the lubrication system (attached), which includes a cut-away view of the oil tank, revealing that they both connect to a ‘mini-tank’ within the main oil tank. I’d be grateful for definitive advice on where these points should be connected to. I suspect the top is connected via rubber tube to the crankcase breather and that the lower may be for the rocker cover breather or to atmosphere.

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