YZF750R

[cnkxu1]

When i went back to riding after a break of 20 years, I opted for a Yamaha YZF750R which suited my short little legs. I rode one for many years and eventually sold it. I still have a soft spot for that bike so when a couple came up at a bargain basement price I grabbed them. PO became disheartened after some setbacks and decided to clean out the shed. My gain (I  hope).


Here they are on the way home. I had an epic interstate trip that I just loved doing.

The green one is a 95 model and it has been stored near the sea side so it is a bit shabby. Fairings are repairable and I have another rolling frame and two motors to choose from to make it a goer.
Blue one is a 92 model and needs a bit of work as the PO tried to use an efi fuel pump and regulator on the carbies but I have the correct pump. He also dropped the tank in the shed and dented the new paint job but that can be fixed.
Another project to distract me from finishing the others.

[JonW]

Haha, superb pick ups Chris! Loving the racing blue

[cnkxu1]

May 5, 2021 8:25:49 GMT 1 JonW said:

Haha, superb pick ups Chris! Loving the racing blue

Maybe they were going for this look

[cnkxu1]

May 6, 2021 7:54:38 GMT 1 cnkxu1 said:

May 5, 2021 8:25:49 GMT 1 JonW said:

Haha, superb pick ups Chris! Loving the racing blue

Maybe they were going for this look

This bike had the R1 motor installed albeit with a cut and stretch to the frame. It was a different swingarm and front brakes. It would have been a weapon.

[cnkxu1]

I now have two running motors but both have starter clutch problems. If they don't fire straight away then the starter does not engage and just spins. One is worse than the other with lots of grinding/clashing noises and that was before I changed the oil. I used motorcycle full synthetic 10W40 so no friction modifiers but there may be some age related problems with build up on the metal in the starter clutch. The other seems to catch and fire with a bit of throttle. I guess it is the old adage, a motor has to run and not sit for years. Refurbishing the starter clutch means motor out and splitting the crankcase. Not serviceable from the outside.
New fork tubes have arrived from Italy so the forks are being rebuilt.
There were a lot of wiring issues even with low current switches. I cut one wire insulation open near a solid looking original crimp connector and red dust fell out, no apparent damage to the outer casing and not a high current cable. So lots of reterminating, jumpering around problem spots and new wires where I could.
It was so sweet to hear them both fire up.

[cnkxu1]

Like any motor that has not run for a while these are both getting better with a bit of heat and oil circulation. Fingers crossed.

[JonW]

Those starter clutches are a nightmare with engines like these were you need to rip most of the engine apart to get to them.
Good to know youre making progress mate!

[julianboolean]

I had a YZF750 from 1996 to 2000, brilliant bike, I'd happily have another one, the starter clutch is a total arse to get at on all of the FZ750 based engines, all of them need the crankcases split.

[cnkxu1]

Both of the motors are actually getting a bit better as the new oil cleans the internals up. The old adage is true: Engines need to be run or expensive things inside start to break.

[richb]

I do really fancy one of these. Test rode on 16 years ago and loved it but engine was burning oil despite being low mileage and mate who was workshop manager at the local Honda dealer who had the bike in tempted me to a urban tiger fireblade which do not get me wrong i was more than happy to purchase. In hindsight with me short stumpy 29 inch inside leg and now expanded belly the YZF would have been a better bet. Still have the Blade but one of these would be nice, Blade is tio toes and fully stretched reaching around the tank, but she is gorgeous. The guy who services my cars has what I call the Coilin Edwards colours YZF750R complete with a kerker exhaust nicely tucked away in his unit but cannot tempt him to part with it, shame.
Rich

[cnkxu1]

Aug 10, 2021 8:28:09 GMT 1 richb said:

I do really fancy one of these. Test rode on 16 years ago and loved it but engine was burning oil despite being low mileage and mate who was workshop manager at the local Honda dealer who had the bike in tempted me to a urban tiger fireblade which do not get me wrong i was more than happy to purchase. In hindsight with me short stumpy 29 inch inside leg and now expanded belly the YZF would have been a better bet. Still have the Blade but one of these would be nice, Blade is tio toes and fully stretched reaching around the tank, but she is gorgeous. The guy who services my cars has what I call the Coilin Edwards colours YZF750R complete with a kerker exhaust nicely tucked away in his unit but cannot tempt him to part with it, shame.
Rich

They do grow on you and there are lots of reports of burning oil but I never noticed on my previous ones. Colin had so many colour schemes. Was it the red and white, red, white and black or the yellow and black anniversary?

[alext900]

live.staticflickr.com/65535/51368442047_87a9bf97a7_z.jpg

My YZF750r at Cadwel last month

[richb]

The 1997 spec red and white version.

[Gitram]

I have a 93 one which I was going to put on gumtree this weekend, I expect its a bit far north for you chaps.. (inverness)

marti

[richb]

Bit far from Gloucester. We were up in Ayr back end of May this year as daughter and husband moved up January this year. You are still a way up again from Ayr.
Rich

[cnkxu1]

Aug 11, 2021 14:42:04 GMT 1 Gitram said:

I have a 93 one which I was going to put on gumtree this weekend, I expect its a bit far north for you chaps.. (inverness)

marti

Bit far from Australia too. But if we ever get to travel again, that is one bike I would buy cheaply, travel around Europe and the British Isles and maybe leave at the airport.

[huggy76]

Aug 10, 2021 11:49:42 GMT 1 alext900 said:

live.staticflickr.com/65535/51368442047_87a9bf97a7_z.jpg

My YZF750r at Cadwel last month

Lovely looking bike, have you done any mods to it for track use?

[alext900]

has had head gas flowed and suspension upgrade lightweight BSB type fairings from A1 road n race, blue spot brakes with upgraded master, upgraded rear brake
runs well!

[huggy76]

Aug 23, 2021 10:54:49 GMT 1 alext900 said:

has had head gas flowed and suspension upgrade lightweight BSB type fairings from A1 road n race, blue spot brakes with upgraded master, upgraded rear brake
runs well!

What have you done to upgrade the suspension please?

I’ve got one that needs new/rechromed fork legs and the rear shock is a bit tired too. I bought it to turn into a track bike but never got started with it.

[alext900]

 has ohlins on back and improved springs on front K-Tech are good!

 

[julianboolean]

Every 20 valve Yamaha I've owned has used oil, YZF750 was probably the worst, using about 1 litre every 1000 miles, it never smoked and never went wrong, so feck knows where it was going, my current FZ750 probably uses the least, and it's done 63000 miles, so it's either finally run the bores in, or more likely,I now ride like an old man.

[cnkxu1]

Both motors developed the starter clutch slipping problem so I took one apart, split the cases, installed the spring and dowel kit, put it back together with all new gaskets, checked the valve shims all in spec and rolled it out of the dusty factory into the light of day.
Rode it round the block. All good, in fact great as I realised I had not ridden a bike of any kind for many months.
Now a bit of a clean, a roadworthy and a club permit so I can ride up to 45 days per year on a reduced registration/insurance rate.

[cnkxu1]

I should add I used helicoils on quite a few stripped threads in the valve housings and frame. A bit of abuse from po's

[midlifecrisisrd]

God that pic reminds me of my old 1000 exup i had in the 90's

Same blue, no decals and polished frame

Frightened the bejesus out me

Steve

[cnkxu1]

Took the YZF in for a roadworthy and they found a few things, most importantly the missing bump stop in the rear shock also a small leak and a sagging spring. Went to the factory and stripped the shocks from my two other frames to see if they were any better. Sadly not. One was worth rebuilding so that is happening. The shock needs to come apart to replace the bump stop. I checked every other shock I have from a number of different bikes and the only one that actually had a bump stop in place was the new YSS for the RD350LC. Every other one had perished. That is potentially another $1k for any bike to get roadworthy and something to look at if doing an upgrade with an R6 shock for example.
That made me think that there is a need for a replaceable bump stop maybe made from 3d printing with a profile that clicks together after wrapping around the shaft.

[JonW]

There are aftermarket bumps stops out there that you can use, Ive used this one that webike sells but others are out there if you shop around.

japan.webike.net/products/21843193.html

[cnkxu1]

May 8, 2023 7:43:49 GMT 1 JonW said:

There are aftermarket bumps stops out there that you can use, Ive used this one that webike sells but others are out there if you shop around.

japan.webike.net/products/21843193.html

Yes but you still have to compress the springs remove the seat, then undo the piece holding the seals and that requires re oiling and gassing, major work for me. I was thinking something you could add without disassembling that was structurally sound.

[Tobyjugs]

You can fix the rubber stop in place by removing the spring and then cutting the rubber bump stop down one side very carefully and straight with a scalpal in one go. Depending on the rubber you can use a super glue which will give you hit and miss results or my favourite which is araldite rapide.

Put a very thin smear of grease around the shaft of the shock where the bump stop normaly sits. Then on a dry piece of the shaft open the rubber up slip it over the shaft and apply the glue. Slide it into the correct place on the shaft and fit a small jubilee clip around the rubber and lightly tighten to hold it closed and in the correct shape. Clean the rest of any glue which is on damper shaft off and leaver it to set for 24 hours. when it is time to remove the Jubilee gently prise the clip away from the rubber stop where it is stuck to the clip.

Make sure you degrease the rubber before applying the Araldite.

[JonW]

Ahh ok, I was thinking you'd be ok splitting the shock apart.

[cnkxu1]

May 8, 2023 11:58:27 GMT 1 Tobyjugs said:

You can fix the rubber stop in place by removing the spring and then cutting the rubber bump stop down one side very carefully and straight with a scalpal in one go. Depending on the rubber you can use a super glue which will give you hit and miss results or my favourite which is araldite rapide.

Put a very thin smear of grease around the shaft of the shock where the bump stop normaly sits. Then on a dry piece of the shaft open the rubber up slip it over the shaft and apply the glue. Slide it into the correct place on the shaft and fit a small jubilee clip around the rubber and lightly tighten to hold it closed and in the correct shape. Clean the rest of any glue which is on damper shaft off and leaver it to set for 24 hours. when it is time to remove the Jubilee gently prise the clip away from the rubber stop where it is stuck to the clip.

Make sure you degrease the rubber before applying the Araldite.

Unfortunately won't pass an inspection here.