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Author Topic: A Blast from the Past  (Read 12879 times)

Offline Bevelheadmhr

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Re: A Blast from the Past
« Reply #40 on: Sep 02, 2018, 06:42:42 »
Meanwhile work on the Honda CB72/77 engine is progressing well, its now got a homemade billet block which will take it out to 400cc, while its Eaton supercharger is being remade with matching billet end cases and centre case, the latter is being made at the moment. No performance reason for making a new case, but it'll look cool..

 

Offline Brodie

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Re: A Blast from the Past
« Reply #41 on: Sep 02, 2018, 17:24:35 »
Rad
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Bevelheadmhr

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Re: A Blast from the Past
« Reply #42 on: Mar 26, 2019, 05:00:19 »
This project has been waiting for space to work on it, but its finally coming together. One point that isn't obvious is that the crank centre has been moved 4mm inside the engine to allow for the 400cc big bore conversion. That meant machining out the crank bearing mounts which also meant using bigger / strong crank bearings. A lot of work to say the least.

   

Online hooligan998

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Re: A Blast from the Past
« Reply #43 on: Mar 27, 2019, 01:03:59 »
Now that I've wiped the drool outta my beard, I'm in!

Offline WhyNot

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  • ~~~If it ain't raining, I'm riding~~{iii}?~~prost~
Re: A Blast from the Past
« Reply #44 on: Mar 27, 2019, 06:56:08 »
wow.......just.........wow
1975 CB750K5
1974 CB350F

Offline Bevelheadmhr

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Re: A Blast from the Past
« Reply #45 on: Mar 27, 2019, 08:26:13 »
Found a couple of old photos of the bike when my mate first built it in the early 80s..

Here's a video of us talking about progress with the bike.. starts here... since I made the video, Jeff has been busy making a tool to fold sheet aluminium which is needed to make a new fuel tank for the bike.




Offline Bevelheadmhr

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Re: A Blast from the Past
« Reply #46 on: May 06, 2019, 05:42:17 »
Because of the way the supercharger needed to be mounted behind the engine, and with the constraints imposed by the frame etc, it was decided that the best solution, if not the easiest, was to make a new supercharger case. This new case would have its inlet and outlet moved from the standard location, to one ideal for the bike. Making a supercharger case isn't an easy task to say the least, but its almost done now. Actually once the fixtures and machining steps have been worked out to make one, its not much more work to make another, so that's what we've done.. 4 made so far.

 

Offline Bevelheadmhr

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Re: A Blast from the Past
« Reply #47 on: Jun 10, 2019, 14:03:06 »
This rear wheel came off a Yamaha R1, its been painted and polished to be used on the Honda. But its also had its cush drive removed and an alloy plate welded onto to the hub in its place to mount the sprocket. This was done to keep the wheel as narrow as possible and also because a drag bike doesn't need a cush drive.

 

Offline Bevelheadmhr

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Re: A Blast from the Past
« Reply #48 on: Jun 25, 2019, 12:32:41 »
The Honda CB72 drag bike project took one step forward and two back when the new 17 inch rear wheel got its drag slick and was fitted to the bike. The frame was build to take a 18 inch wheel and drag tyre, the latter being no longer available, so a change to a 17 inch wheel was needed. But the new tyre is much taller than the original and raises the back end way too much, and being a hard tail there's not that can be done. Except make a new back end for the frame, cut the original frame in half and weld the old front half to the new rear..

Also the billet supercharger is almost finished, now with its mounts and drive snout base machined.