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Author Topic: CB750 F to K  (Read 7782 times)

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: CB750 F to K
« Reply #10 on: Mar 03, 2016, 14:27:26 »
This took a long time. Please read it.

Since a few other knowledgable members have already touched on the suspension follies, i'll focus elsewhere, for now.

Get your tissues ready.

It all started when I Payed way to much for a non running CB750F1
Regardless of how you feel about my following comments, please let us know how much you paid.

How I bought her


That's nearly original. You should have passed it to someone that could have restored it. Next time you want to do whatever it is you're doing, start with a less original bike.


Couple of hours in my possession
Are you proud of that or what? It doesn't take a rocket scientist to dismantle a cb750.


Chop chop

Yep have at it. Hopefully this one will be the last for you.


Pulled the motor. At first the idea was to only refresh the top end.

Why? You never even heard it run. Motor looks to be in fine shape in the first picture but shoot i dont know much about these things.

But after some reading I decided to to do the complete engine.

After some reading!? Here is the equivalent to what you just told us:






Then it was time to seat some valves

'Seat some valves'? Lol. No, it wasn't.




Please explain why on earth you would lap old valves in old seats.


I didn't like how the seat looked and at the time I couldn't find enough info for building myself a oil tank.
So change of plans. This is where I concluded I liked the tracker look

Let us know when you start going in that direction. What you are building now is a Brat.

Bought myself a cheap MIG welder second hand and made the loop fit

Made it fit what? Its at LEAST 2 inches too close to your ridiculously wide rear tire. I suppose you wanted to negatively affect every single aspect of the performance on this motorcycle? I can't see any other reason.


Time to rebuild the motor! I did everything that needed to be done. New bearings, new stretchbolts, new chains, new tensioner,...

Are you building it oustide, or just bringing it outside to let the dirt find its way in easier during pics? Seiing this makes me cringe.

Whatcha got there, assembly lube?

How'd the bearings fit?


Got a great deal on a GSXR front end!

How much? Was the bike wrecked? They don't usuallly sell parts from 2005 unless they have been crashed.


Deglazed the jugs


Didja now, who taught you how to do that? What rpm does that drill operate at? What did your cylinders measure?




The time I tried to weld aluminium with steel on a MIG wilder  :o ::)
Sounds legit.


As much as I like Cognito Moto's stuff
Too legit to quit


So i tried to make my own tank

I followed a fellow DDT'er his measurements. It stated a 3,2qt capacity. After building the thing it only fits 2qt's

If you could only see the shock on my face right now

I have been reading a lot about POD filters. I know, I know..

Hmm. More reading huh? Air intake is the least of your concern at this point.

That's it for now.

burning bridges sometimes light the most productive paths

Offline Goonz

  • Posts: 27
Re: CB750 F to K
« Reply #11 on: Mar 03, 2016, 14:44:31 »
This took a long time. Please read it.

Since a few other knowledgable members have already touched on the suspension follies, i'll focus elsewhere, for now.

Quote
Get your tissues ready.
Regardless of how you feel about my following comments, please let us know how much you paid.

Payed 1250/$1370 for it.

Quote
That's nearly original. You should have passed it to someone that could have restored it. Next time you want to do whatever it is you're doing, start with a less original bike.

That was the original idea, however it was impossible to find one!

Quote
Are you proud of that or what? It doesn't take a rocket scientist to dismantle a cb750.

Build thread wouldn't be fun without pictures.

Quote
Yep have at it. Hopefully this one will be the last for you.

I like it so far, maybe others will follow. Who knows.


Quote
Why? You never even heard it run. Motor looks to be in fine shape in the first picture but shoot i dont know much about these things.

I did hear it run. Chain rattle and some other weird noises.

Quote
After some reading!? Here is the equivalent to what you just told us:


Like most people I learn things from books.


Quote
'Seat some valves'? Lol. No, it wasn't.

This one you may be right.




Quote
Please explain why on earth you would lap old valves in old seats.

Just making sure they weren't leaking


Let us know when you start going in that direction. What you are building now is a Brat.

Quote
Made it fit what? Its at LEAST 2 inches too close to your ridiculously wide rear tire. I suppose you wanted to negatively affect every single aspect of the performance on this motorcycle? I can't see any other reason.

Made it fir the look I'm after.

Quote
Are you building it oustide, or just bringing it outside to let the dirt find its way in easier during pics? Seiing this makes me cringe.

No need to cringe

Quote
Whatcha got there, assembly lube?

That is correct

Quote
How'd the bearings fit?

Fine


Quote
How much? Was the bike wrecked? They don't usuallly sell parts from 2005 unless they have been crashed.

500 for just the forks. Not crashed, straight en no leaks.

Quote
Didja now, who taught you how to do that? What rpm does that drill operate at? What did your cylinders measure?

My dad did.

Quote
Sounds legit.

Learned from it, so that's great.

Quote
Too legit to quit

Yeah...

Quote
If you could only see the shock on my face right now

Why is that? I'm not the first one who builds a custom oil tank.

Quote
Hmm. More reading huh? Air intake is the least of your concern at this point.

You are correct, still a way to go before it's done.


I hope I answered all of your questions. English is not my main language so forgive any faults.

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: CB750 F to K
« Reply #12 on: Mar 03, 2016, 14:48:06 »
Nope you answered all my questions, mostly by not answering some of them.

Good luck.
« Last Edit: Mar 03, 2016, 14:52:21 by DohcBikes »
burning bridges sometimes light the most productive paths

Offline Goonz

  • Posts: 27
Re: CB750 F to K
« Reply #13 on: Mar 03, 2016, 14:49:50 »
Nope you answered all my questions, mostly by not answering some of them. Good luck.

Thanks!

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: CB750 F to K
« Reply #14 on: Mar 03, 2016, 14:52:48 »
You didnt pay too much for the original bike.

I dont believe for one second that you heard it run. Your pictures are a testament.

You have no idea how to build an engine, and reading is not how everyone learns. I'll venture an educated guess that there are plenty of illiterate people out there that can build a damn good engine.

i'll be stopping by
burning bridges sometimes light the most productive paths

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: CB750 F to K
« Reply #15 on: Mar 03, 2016, 14:55:09 »
All that work and you used old valves, then did even more damage before reassembly because you are attempting to learn a skill through reading that is actually learned through observing and practicing.

Tell us what 1 cylinder measured and i'll let it go.
burning bridges sometimes light the most productive paths

Offline Goonz

  • Posts: 27
Re: CB750 F to K
« Reply #16 on: Mar 03, 2016, 14:56:29 »
You didnt pay too much for the original bike.

I dont believe for one second that you heard it run. Your pictures are a testament.

You have no idea how to build an engine, and reading is not how everyone learns. I'll venture an educated guess that there are plenty of illiterate people out there that can build a damn good engine.

i'll be stopping by

Please do!
Thanks!

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: CB750 F to K
« Reply #17 on: Mar 03, 2016, 15:01:05 »
You have 2 options:

A. Take the engine apart and build it right.

B. Have an oil burner that wont pull what a stock engine would on the dyno.

People rebuild engines to get the power and tolerance back to spec, not just to say they did it.

burning bridges sometimes light the most productive paths

Offline Goonz

  • Posts: 27
Re: CB750 F to K
« Reply #18 on: Mar 03, 2016, 15:06:25 »
You have 2 options:

A. Take the engine apart and build it right.

B. Have an oil burner that wont pull what a stock engine would on the dyno.

People rebuild engines to get the power and tolerance back to spec, not just to say they did it.



I'll take note of that. Thanks for the great advice!

Offline Nj732port

  • Posts: 539
Re: CB750 F to K
« Reply #19 on: Mar 03, 2016, 15:54:19 »
Looks great so far, that oil tank is gonna be nice once you get it right, is it going to double as a mud guard?

make sure you take the criticism as positive on here!

Dohc hasn't steered me wrong yet and theres nothing he enjoys more than hacking up a pristine bike like yours! ;)