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Another Z650...

Work in Progress

Moderators: chrisu, paul doran, Taffus, KeithZ1R

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Bevelhead
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Re: Another Z650...

#76 PostAuthor: Bevelhead » Wed Jun 07, 2023 9:19 pm

I couldn't work out why the bike was only running on 3 cylinders, however the green F2 carbs were very clean, so I replaced the carbs on the bike with the F2 carbs and without much hope, hit the starter.... and the engine sprang to life on all 4 cylinders for the first time! I still have no idea what's the problem with the no1 carb off the bike, but now I know for sure the fault lies with the carb and not anything else.

Sadly the F2 carbs can't stay on the bike as they are needed for the F2 in a couple of weeks time.

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Re: Another Z650...

#77 PostAuthor: Bevelhead » Fri Jun 09, 2023 10:35 am

While there a few small items that need to be done, such as rechroming the kickstart and brake lever (to be done next winter), and of course the original carb problem, the bike is now finished..

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Re: Another Z650...

#78 PostAuthor: KWACKERZ1 » Thu Jul 13, 2023 6:22 pm

Looks good, nice job

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Bevelhead
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Re: Another Z650...

#79 PostAuthor: Bevelhead » Thu Jul 20, 2023 11:30 am

Another day and another Z650, but not mine this time, but one whose build I shall be following. My friend is doing the work for a customer, who has owned the bike for more than thirty years, and so is very attached to it.

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It has some old cool parts fitted, such as the CMA wheels, Davida swing arm, and a Gpz750 engine. All these parts will be going, as its being fitted with a big bore Gpz750 turbo engine, with a bigger turbo, already built, along with modern wheels, brakes and suspension.

As of yesterday the bike has ben stripped, and the frame will be put on a frame jig to make sure all is well, before being braced.

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Re: Another Z650...

#80 PostAuthor: Bevelhead » Tue Oct 17, 2023 3:08 pm

More work done on the Z650 turbo ...

ZRX1200 swingarm, billet yokes to fit ZXR750 forks and wheels, and mounts added for one off rear sets. The frame has now gone off to be powder coated at Triple S in Bingley.

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Re: Another Z650...

#81 PostAuthor: Bevelhead » Sat Nov 25, 2023 8:09 am

With the frame back from powder coating, and new stainless engine bolts made, time to fit the turbo engine into the frame, or rather fit the frame over the engine. Soon became clear that the turbo engine mounts were different from that of a Z650, the upper front mount being missing from the turbo motor, while spacers will be required elsewhere.

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Re: Another Z650...

#82 PostAuthor: Garry.L » Sat Nov 25, 2023 6:23 pm

A standard 750 Turbo runs nearly double the power of a Stock Z650, add on those mods as well and it should be a seriously quick bike. :shock:
ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ

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Re: Another Z650...

#83 PostAuthor: Bevelhead » Sun Nov 26, 2023 12:54 pm

Just heard that the turbo engine will have to come out of the frame and be stripped right down, as a serious problem has been found in the rebuilt engine. The engine was rebuilt at great expense, by some workshop 'down South' who I'm told are no longer trading.

The Hyvo primary chain is so loose that when the transmission is turned, it just slides over the crank. Its clearly far too long. Must be from a different model, perhaps someone fitted a chain from the 750 twin??

With such an obvious mistake, everything will need to come apart and double checked.

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Re: Another Z650...

#84 PostAuthor: Garry.L » Sun Nov 26, 2023 3:10 pm

Don't know if it's any help but plenty of good info on here. https://www.750turbo.com/forum/index.php

And.. https://www.750turbo.com/manuals/750%20 ... 0Parts.pdf
ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ

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Re: Another Z650...

#85 PostAuthor: Bevelhead » Sun Nov 26, 2023 5:21 pm

Garry.L wrote:Don't know if it's any help but plenty of good info on here. https://www.750turbo.com/forum/index.php

And.. https://www.750turbo.com/manuals/750%20 ... 0Parts.pdf


Oh the turbo isn't my bike thankfully, will be interesting to see if there is anything else wrong with the engine when its taken apart. How any workshop could fit a primary chain that is so obviously wrong I don't know.

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Re: Another Z650...

#86 PostAuthor: Bevelhead » Tue Jan 09, 2024 5:54 pm

With the correct length chain fitted, the engine is now going back together..

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Re: Another Z650...

#87 PostAuthor: Bevelhead » Tue Jan 09, 2024 6:08 pm

While over Xmas, I bought a 78 650 frame, complete with all important V5, which is the start of a new project for me. I only bought a frame as everything else, apart from the bodywork will be changed. The goal is to get the bike down to 400lbs dry, with over 80 bhp, along with modern suspension and brakes. In the pic below can be seen the first mod, a ZRX1100 swing arm, which in turn needed work to repair some crash damage.

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The front end I wanted to use, soon hit a snag, as the stem of the R6 yoke was too short. Therefore, a Z650 stem will be liberated and used with the new bottom yoke. Since the R6 uses clip ons, I bought a top yoke from an FZ6 Fazer of the same year. Sadly the FZ6 has different dimensions from the R6, even though they both use 43mm forks.

The wheels will also be from an R6, as I had a good pair left over from a previous project. They are impressively light, as are their discs and calipers, along with tyres, these parts alone are 30lbs lighter than the standard Z650 parts.

The R6 rear spindle is 28mm, while the ZRX 1100 is 20mm, so will need to make suitable adaptor spacers..

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