Author Topic: 85 fz 750  (Read 12981 times)

0 Members and 1 Guest are viewing this topic.

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,418
  • SOHC4 member # 2605
Re: 85 fz 750
« Reply #150 on: August 28, 2024, 12:42:10 AM »
Leino, sorry to hear that... Hang in there
David- back in the desert SW!

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #151 on: August 28, 2024, 01:12:15 AM »
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  ;D

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #152 on: October 08, 2024, 10:23:28 AM »
Finally, dyno results. 132,67hp and 99nm at the rear wheel.

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #153 on: October 08, 2024, 10:35:20 AM »
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.



Offline Mark1976

  • Hot Shot
  • ***
  • Posts: 688
Re: 85 fz 750
« Reply #154 on: October 08, 2024, 03:15:50 PM »
Finally, dyno results. 132,67hp and 99nm at the rear wheel.
Did you use a Yamaha part number cam or an aftermarket cam?
Start with the end in mind...

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #155 on: October 08, 2024, 08:16:38 PM »
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.

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #156 on: October 08, 2024, 09:04:31 PM »
911 and 961 were both basically built from recycled scrap metal  ;D

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,311
  • Humboldt, AZ
Re: 85 fz 750
« Reply #157 on: October 08, 2024, 09:12:58 PM »
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. ;D
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline Mark1976

  • Hot Shot
  • ***
  • Posts: 688
Re: 85 fz 750
« Reply #158 on: October 08, 2024, 09:38:57 PM »
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...
Start with the end in mind...

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #159 on: October 08, 2024, 10:33:09 PM »
YZF-R 750

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #160 on: October 08, 2024, 10:34:46 PM »
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. ;D
Sure. Will post later.

Offline Mark1976

  • Hot Shot
  • ***
  • Posts: 688
Re: 85 fz 750
« Reply #161 on: October 09, 2024, 04:33:18 PM »
Start with the end in mind...

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,198
  • I love to restore & travel. Keep'em Going Strong !
Re: 85 fz 750
« Reply #162 on: October 09, 2024, 08:06:32 PM »
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Mark1976

  • Hot Shot
  • ***
  • Posts: 688
Re: 85 fz 750
« Reply #163 on: October 09, 2024, 08:29:30 PM »
   It is, and too funny. But I'll take all the help I can get...
Start with the end in mind...

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,198
  • I love to restore & travel. Keep'em Going Strong !
Re: 85 fz 750
« Reply #164 on: October 09, 2024, 09:04:45 PM »
   It is, and too funny. But I'll take all the help I can get...

The Machine came out nice  8)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #165 on: October 10, 2024, 01:50:20 AM »
   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  ;D

Offline Mark1976

  • Hot Shot
  • ***
  • Posts: 688
Re: 85 fz 750
« Reply #166 on: October 10, 2024, 06:39:14 AM »
   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.
Start with the end in mind...

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #167 on: October 14, 2024, 03:03:51 AM »
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.

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #168 on: October 24, 2024, 09:15:53 AM »
japi24 by Juha Leino, on Flickr

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #169 on: October 24, 2024, 09:19:32 AM »
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  ;D

Offline Leino

  • Not much of an
  • Expert
  • ****
  • Posts: 1,263
  • in drag racing since 2005
Re: 85 fz 750
« Reply #170 on: October 24, 2024, 10:04:38 AM »
   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.