Zephyr 550/600 conversion - info please

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GPZ592
Posts: 4
Joined: 26 Jun 2022, 12:02

Zephyr 550/600 conversion - info please

Post by GPZ592 »

HI all,

I've picked up a shed of Zephyr 550 that has stood outside under a cover for 10 years. As you can imagine, rust, corrosion and general decay have taken hold, but it is redeemable and all the bits are there. Most importantly, the tank is solid despite or because of, the old stale fuel in it ! The engine however had the carbs removed, so the inlets have been open to the elements :-( Also the engine number is different on the V5, so it's been changed at some point and is an unknown quantity.

Now, I like a project and I've seen a few 550s where a GPz/GPX 600 engine has been fitted and I'm keen to hear from anyone on here who has done this particular modification. I happen to have a GPX600 engine, carbs, CDI sitting under the bench in the garage (as you do !), so I'd like to know what it entails and any potential "gotchas".

All help/advice gratefully received :)

TIA

Mark.
Stereordinary
Posts: 161
Joined: 05 Aug 2020, 16:21
Location: Vancouver Washington USA
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Re: Zephyr 550/600 conversion - info please

Post by Stereordinary »

Unfortunately I can’t answer any of your questions, as I’ve never done any kind of engine swap before. I have installed a Wiseco 615cc big bore piston kit though, and I can say that it’s not a very difficult job.

Do you have links to where you saw other folks do 550 to 600 engine swaps on their bikes? I’d be curious to see them myself. I recently got curious about the same idea you have.
A breeze from the west.
GPZ592
Posts: 4
Joined: 26 Jun 2022, 12:02

Re: Zephyr 550/600 conversion - info please

Post by GPZ592 »

Hi,

I've not found any build threads, just some pictures and anecdotes about the conversion, hence my original post -

https://www.zephyr-zone.com/zz/viewtopic.php?f=9&t=242

https://www.zephyr-zone.com/zz/viewtopic.php?f=3&t=116

https://www.zephyr-zone.com/zz/viewtopic.php?t=435

I have PM'd the OP of these threads, but not had a response, so I guess they don't come on here any more...........
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