Topic: 85 fz 750

[RAFster122s]

Leino, sorry to hear that... Hang in there

[Leino]

Leino, sorry to hear that... Hang in there

Oh well, maybe someone will reveal the potential of the 961 but I won't be around to witness it 

[Leino]

Finally, dyno results. 132,67hp and 99nm at the rear wheel.

[Leino]

Most important, we solved some of the low range issues with ignition timing and result was a very responsive engine with wide smooth torque and power band.
Rev limiter at 11500 was just right for this setup as power starts to come down slightly at around 11K.

[Mark1976]

Finally, dyno results. 132,67hp and 99nm at the rear wheel.

Did you use a Yamaha part number cam or an aftermarket cam?

[Leino]

Finally, dyno results. 132,67hp and 99nm at the rear wheel.

Did you use a Yamaha part number cam or an aftermarket cam?

Stock Yamaha cams with adjustable sprockets. Nothing fancy and nothing aftermarket was used if you don't count carbs and cam chain.

[Leino]

911 and 961 were both basically built from recycled scrap metal 

[scottly]

Finally, dyno results. 132,67hp and 99nm at the rear wheel.

Can you please post a graph? Some of us like to look at them.

[Mark1976]

Finally, dyno results. 132,67hp and 99nm at the rear wheel.

Did you use a Yamaha part number cam or an aftermarket cam?

Stock Yamaha cams with adjustable sprockets. Nothing fancy and nothing aftermarket was used if you don't count carbs and cam chain.

Fzr1000 cams? Or something else...

[Leino]

YZF-R 750

[Leino]

Finally, dyno results. 132,67hp and 99nm at the rear wheel.

Can you please post a graph? Some of us like to look at them.

Sure. Will post later.

[Mark1976]

https://raresportbikesforsale.com/1985-yamaha-fz750/

[grcamna2]

https://raresportbikesforsale.com/1985-yamaha-fz750/

Mark,is this your 750 for sale ?

[Mark1976]

   It is, and too funny. But I'll take all the help I can get...

[grcamna2]

   It is, and too funny. But I'll take all the help I can get...

The Machine came out nice 

[Leino]

   It is, and too funny. But I'll take all the help I can get...

Don't sell it. Build a 961 and have a good time 

[Mark1976]

   I really would like too pass it on for someone else to enjoy, but it simply is just so much fun to ride that I haven't felt any pressure to sell it. It's completely stock with the exception of a K&N stage 1 carb kit. If another one came along I'd definitely do the 961 conversion, like you mentioned before, it's all yamaha parts. But finding another example in any condition is a challenge, I believe there were about 5000 produced and sold in '85, so not many. Best part is, everything works, very common not to have a working gas gauge or kickstand safety switch. But I've got a relatively early '75 cb400f on the floor at the moment, just about done with the build up and getting ready to tear it all down and send it off to powder coat. So yeah,  priorities... Prices for bikes have come down a bit, (which is good) but by next spring they'll shoot right back up, big question will be, by how much.

[Leino]

Kinda funny. No one wants them around here so you  can pick up one for next to nothing and they were very common back in the day even though they were pricy.

[Leino]

japi24 by Juha Leino, on Flickr

[Leino]

There you go. Took a while to get it from the dyno guy. As you can see the torque is pretty smooth and wide so should be fairly easy to ride fast. We talked about the HP and after talking to several people, it seems we are pretty much even with the first gen R1 results and that's with a 1987 FZ 750 based mix and match stock parts engine. They should have built it like this in the first place 

[Leino]

   I really would like too pass it on for someone else to enjoy, but it simply is just so much fun to ride that I haven't felt any pressure to sell it. It's completely stock with the exception of a K&N stage 1 carb kit. If another one came along I'd definitely do the 961 conversion, like you mentioned before, it's all yamaha parts. But finding another example in any condition is a challenge, I believe there were about 5000 produced and sold in '85, so not many. Best part is, everything works, very common not to have a working gas gauge or kickstand safety switch. But I've got a relatively early '75 cb400f on the floor at the moment, just about done with the build up and getting ready to tear it all down and send it off to powder coat. So yeah,  priorities... Prices for bikes have come down a bit, (which is good) but by next spring they'll shoot right back up, big question will be, by how much.

Late model engine is better if you want to build a 961, easier to add oil jets to spray oil under the pistons etc.

[Leino]

I'm thinking of building one more FZ engine. 986cc, oversize valves.

[Mark1976]

   Would love to do another, but finding a bike that's not trashed beyond reason is the problem. I don't mind building them back up but, I'm kinda tiring on the extent to which I have to go to get there these days. We'll see, gotta get the holidays behind me before I can focus on anything else at the moment.

[RAFster122s]

Yamaha is not known for having deep parts availability either I am told, so that complicates restoration work… mid 80s was 40 years after all…

[Mark1976]

Yamaha is not known for having deep parts availability either I am told, so that complicates restoration work… mid 80s was 40 years after all…

   For the engine (topend), without a doubt. Spent many a day doing nothing but parts surfing, the rest of the bike not so much. $$ becomes the limiting factor, I could drop well over 1k just bringing the head around properly, my cost, me doing all the work. In a sohc, 8 valves, 8 guides, one cam etc, not so bad, still not cheap. The FZ topend, everything starts at 20, and its all much smaller and expensive and harder to find. Once its together, properly, it'll run run for 100k mileage wise with only a handful of maintenance checks. But if ya ignore the maintenance intervals (valves) it'll go south very quickly and that's what happens by the time I find the damn things.