PRO­JECT BIKE

CB750 Dun­stall is on the way back

Motorcycle News (UK) - - This Week - richard.new­land@mo­tor­cy­cle­news.com

After years of in­ac­tiv­ity, my CB750 Dun­stall is fi­nally start­ing to feel the fruits of my labour. Hav­ing lan­guished while I stock­piled parts, the process of re­birth has com­menced.

The first prob­lem was ig­ni­tion, or – more ac­cu­rately – the com­plete lack thereof. With no keys for the cut and bodged ig­ni­tion switch, and no ig­ni­tion or points plate be­hind the en­gine cover, all mixed with a bird’s nest ex­plo­sion of dis­con­nected wiring – there was no chance of as­sess­ing just how elec­tron­i­cally chal­lenged the Dunny re­ally was.

So I sourced a new old stock ig­ni­tion bar­rel from Thai­land, a back-plate, points and ig­ni­tion tim­ing plate from the States, and a new elec­tronic ig­ni­tion kit from Frank Wrathall De­vel­op­ments (www.fwde­vel­op­ments.com), and set to work. With the new ig­ni­tion fit­ted, I started try­ing to con­nect the switchgear, clocks, and main loom to­gether – with lim­ited suc­cess. The switchgear wiring didn’t match the loom, and no amount of star­ing at a wiring di­a­gram could un­ravel the labyrinthine mass of wires. Trial and er­ror, and a mul­ti­me­ter, got me most of the way though – and with a bat­tery con­nected I even­tu­ally saw the id­iot lights come alive, while prod­ding the starter but­ton ac­tu­ally re­sulted in ac­tion in the bow­els of the en­gine. It’s alive. Well, sort of.

The loom was a mess though, and logic dic­tated that it had to go. With a brand new re­place­ment bought from David Sil­ver Spares, I care­fully swapped old for new. The switchgear wiring was equally bad­gered, and the left­hand switchgear was also bro­ken. With new ones bought I was in a new world of elec­tri­cal clean­li­ness.

Now all I needed to do was sort out the fuel sys­tem and see if it would spring into life after decades of in­ac­tiv­ity.

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