FZ750 Genesis - 1989

russell664 · 21 May 2021 at 10:06

Hi all,

Figured i'd do a little log of this very special (To me) bike.

So this bike has been through three genrations so far and has been in the family since new - This is the main reason why i'm doing my A license in the beginning of June. First she was bought new by my Grandad, then after a couple of years, she was given to my Dad who kept it for just over 30 years.
I remeber being around 8-9 years old and sitting on it, just in awe of the noise and look of the bike.

Anyway, my dad is having a big clearout and the FZ needed to go somewhere - My Dad didn't want to sell it, but asked if I wanted it and I of course said yes.

Now she is a little poorly - She needs a carb clean and balance at minimum. When you start her up, three cylinders go, the forth goes after she is warm. The idle jets must be blocked, at least partially. Rough idle and a bit hesitant.

She needs a tidy up like a polish on the engine covers and a new coat of paint on the lump.

The bike has a FZR front end on it, and uprated brakes too.

Anyway, pictures:

https://ibb.co/8cNVnc4]

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Of course, the pesky SV is lurking in the background

Malt_Vinegar · 23 May 2021 at 00:41

Awesome! Looking forward to the progress

Other than the engine block corrosion, it looks like its worn the years well!!

.one. · 24 May 2021 at 01:39

I owned one back in the day I bought as a rat bike 20 valve motor quick for the time mate I bought from wanted her back little while later so sold it back to him but did enjoy her for a while lol.

russell664 · 20 Jul 2021 at 09:40

So, shes now running!

A few things, I cleaned all of the carbs out, ended up bench syncing the carbs as cylinder 3-4 butterflys where open compared to 1-2.
Replaced the inlet rubbers, from the carbs.

I also replaced the o-rings between the head and manifold as I think air was being let in on cylinder 3.

Placed the carbs back on the bike, gave them a good push and what have you. Primed the pump, and started on the button!
I've been chasing hanging idles - Most of it was due to air. The other rason is because of cable free play... Still need to adjust them to make them right.

When the bike is cold it doesn't really do it, but when warm the revs hang a little, but if you push the throttle tube back the idles goes down straight away.

More pictures to come soon.

Malt_Vinegar · 20 Jul 2021 at 09:43

Awesome work. Now you can really get down to business

russell664 · 20 Jul 2021 at 10:15

Malt_Vinegar said:
Awesome work. Now you can really get down to business

Took her about 40 miles since.

Does this sound like a sticky return cable to you?

Start bike, revs up and down fine, sometimes it sticks, many when warm. But firmly holding the throttle tube brings it back down instantly. Revving the bike while pushing the throttle tube back, the idle is perfect, and instantly back like it should be.

Twist the throttle again, revs hang, unless I push the throttle tube back.

I got a new screw for my choke knob.

russell664 · 20 Jul 2021 at 10:23

I have done some cosmetic work, got rid of he pitting on the exchaust and re-painted the tips.

Removed the bubbling on the engine casings, and corrosion and given her a lick of paint.
The engine casing is dull at the moment, I need to shine it up, but looks much better so far.

Here are some piccies of how she looks now:

When she started up, and ran nice I was so, so happy. The first ride was lovely, it felt amazing to be riding a bike passed down through 3 generations.

Hades · 20 Jul 2021 at 12:10

There is someothing so cool about genuinely old bikes.

BUDFORCE · 20 Jul 2021 at 12:32

Does it still need an MOT?

russell664 · 20 Jul 2021 at 13:09

BUDFORCE said:
Does it still need an MOT?

Nope all passed!

No advisories either.

BUDFORCE · 20 Jul 2021 at 13:14

russell664 said:
Nope all passed!

No advisories either.

No I just wondered, isn't it a case when a vehicle gets old enough it no longer requires one at all?

russell664 · 20 Jul 2021 at 13:24

BUDFORCE said:
No I just wondered, isn't it a case when a vehicle gets old enough it no longer requires one at all?

I think that happens when the vehicle is 40 years, or registered before 1960:

https://www.gov.uk/government/publi...toric-classic-vehicles-mot-exemption-criteria

Only 32 years here!

BUDFORCE · 20 Jul 2021 at 13:34

russell664 said:
I think that happens when the vehicle is 40 years, or registered before 1960:

https://www.gov.uk/government/publi...toric-classic-vehicles-mot-exemption-criteria

Only 32 years here!

Oh ok, my SV650 is 18 years old still a way to go then.

I'm sure your bike will still be going in 8 years time, be cool not to have to go through that every year.

russell664 · 20 Jul 2021 at 13:49

BUDFORCE said:
Oh ok, my SV650 is 18 years old still a way to go then.

I'm sure your bike will still be going in 8 years time, be cool not to have to go through that every year.

My SV is hitting 21 this year!

I hope she is running right in 8 years time.

Malt_Vinegar · 20 Jul 2021 at 14:46

I would just check for tension on the return, it may be too slack at throttle closed (or the other cable is too tight not allowing it to return!), and you pushing it shut is enough to overcome whichever one is causing the issue

russell664 · 21 Jul 2021 at 10:28

Malt_Vinegar said:
I would just check for tension on the return, it may be too slack at throttle closed (or the other cable is too tight not allowing it to return!), and you pushing it shut is enough to overcome whichever one is causing the issue

Hey mate,

Had a look at this yesterday - It is still doing it.
I have lubricated the spring linkages on the carbs, they snap shut with a reassuring click. Loosened off both the pull and return cable, flicking the throttle, it appears to close just fine.

Started the bike in, the same thing, unless I roll the throttle tube back then idle goes back to normal. Staright away, it isn't an air leak because I wouldn't be able to replicate it each time. If I push it back while closingt he throttle with a firm grip, idle goes down like it should, blip it and the idle goes 500 rpm huigher than usual, until I do the same again.

The carbs snap back, with the tank off and what have you.

Any ideas? Really annoying me now :mad:

. Could do with some advice at this point.

Munchies · 21 Jul 2021 at 13:16

If it snaps back with tank off I'd be checking cable routing to make sure it''s not kinking / snagging when all together. Lube your throttle cables and remove throttle tube to check that isn't binding. Bike looks to be in very good condition. I'm a sucker for late 80's early 90's bikes. Enjoy it

russell664 · 22 Jul 2021 at 08:43

Munchies said:
If it snaps back with tank off I'd be checking cable routing to make sure it''s not kinking / snagging when all together. Lube your throttle cables and remove throttle tube to check that isn't binding. Bike looks to be in very good condition. I'm a sucker for late 80's early 90's bikes. Enjoy it

Thank you.

Another update, took her home, whipped tank off.
I noticed a noise, almost like a rattle, two screws have fell of the bar which hold the carbs together - so loctited those back in.

Slight hanging is still there, not got any 3-1 oil yet.

However, the rattle is still there, it sounds like screws sat on top of the block vibrating, but I can't see them... Might have to take the whole bottom fairing off again to have a look.

I definately doesn't sound like a knock - Oil is where it should be. I hope that it isn't a knock, and its just something vibrating. Seems to be louder when the engine is vibrating more at say 3-4k rpm.

Munchies · 22 Jul 2021 at 10:32

An exhaust leak can sound like a rattle while it's running check around the headers for a leak.

russell664 · 26 Jul 2021 at 13:40

Still got a bit of a sticky cable for the throttle.

I've made a video of the ticking noise I was referring to, you can hear it properly towards the end of the video.
The bike rides lovely and has power everywhere - Just wanted to see what you guys make of this noise, does it sound ok? I'm thinking cam chain rattle, which is fine the SV does that a lot anyway.

posted the video below.

https://youtube.com/shorts/m_XOn040J6A?feature=share

FZ750 Genesis - 1989

Transmission breaker

Transmission breaker

Transmission breaker