Author Topic: 1977 cb750f2 (915cc) (Read 240720 times)

rickmoore24 · « **Reply #425 on:** April 07, 2011, 01:50:38 PM »

Sounds awesome, even without the cam! Well done.

MRieck · « **Reply #426 on:** April 07, 2011, 05:42:49 PM »

Quote from: tweakin on March 29, 2011, 07:51:33 PM

Quote from: oldhondarider on March 29, 2011, 08:16:15 AM
I'd like to swing by and see it in person..
Anytime, sent you a pm.

Quote from: rickmoore24 on March 29, 2011, 11:31:23 AM
Awesome! Can't wait to hear that cam roll around.

Me to, I just hope I get all the clearance i need to comfortably run the cam.

What was piston to valve for the intake and exhaust? I'm surprised the reliefs weren't deep enough. Obviously the relief diameter was OK as you are using stock size valves. I've generally had more problems with relief diameter and oversize valves. That 65 cam would really wake that engine up.

tweakin · « **Reply #427 on:** April 07, 2011, 07:38:04 PM »

Quote from: MRieck on April 07, 2011, 05:42:49 PM

Quote from: tweakin on March 29, 2011, 07:51:33 PM
Quote from: oldhondarider on March 29, 2011, 08:16:15 AM
I'd like to swing by and see it in person..
Anytime, sent you a pm.

Quote from: rickmoore24 on March 29, 2011, 11:31:23 AM
Awesome! Can't wait to hear that cam roll around.

Me to, I just hope I get all the clearance i need to comfortably run the cam.

What was piston to valve for the intake and exhaust? I'm surprised the reliefs weren't deep enough. Obviously the relief diameter was OK as you are using stock size valves. I've generally had more problems with relief diameter and oversize valves. That 65 cam would really wake that engine up.

My problems just might have been my lack of skills degreeing in the cam and being fairly new working with old Hondas. The exhaust clearance was about .60, This made me a bit concerned and I did't want to grind on the valve pockets. I am going to run what I have for now while I look for a donor motor to build up. I am keeping the cam for this next build. I figure I will build my dream motor and slap it in this bike rather than starting another bike.

tweakin · « **Reply #428 on:** April 14, 2011, 06:01:34 AM »

Yesterday I picked up my next project. I got a 1977 750K and 1973 750 K engine, both complete for $200. The plan is to build a second high performance engine for my 1977 F2 (836).

Possibly a 890 or just higher compression 836.

Here is the plan
* undercut trans
* lighten/balanced crank with rods
* complete head work (what ever MRieck recommends)
* all new bearings and chains
* M3 racing cam chain tensioner
* lightened rockers
* Megacycle 165 cam

This will be cone as funds become available so I can stay married.

I got the K engine tore down last night and all looks good inside. I just happy I found this forum with such a wealth on knowledge.

1977K

1973

strtlegal · « **Reply #429 on:** April 14, 2011, 07:13:39 AM »

Quote from: tweakin on April 14, 2011, 06:01:34 AM

Yesterday I picked up my next project. I got a 1977 750K and 1973 750 K engine, both complete for $200. The plan is to build a second high performance engine for my 1977 F2 (836).

Possibly a 890 or just higher compression 836.

Here is the plan
* undercut trans
* lighten/balanced crank with rods
* complete head work (what ever MRieck recommends)
* all new bearings and chains
* M3 racing cam chain tensioner
* lightened rockers
* Megacycle 165 cam

FU...I'm just REALLY jealous, that's all.

Freaky1 · « **Reply #430 on:** April 14, 2011, 08:37:08 AM »

Awww man...you stole all my ideas!!

I love the plan & I'm very interested to see how it comes out.

brandEn · « **Reply #431 on:** April 14, 2011, 08:59:37 AM »

I think the Cycle X 915cc kit is in tweakins future...
http://www.cyclexchange.net/Engine%20Parts%20Page%20(Non-Cafe).htm

Mandic · « **Reply #432 on:** April 16, 2011, 07:10:44 AM »

Man you got me thinking. I just picked up a "spare" F2 head to port and rework. Planned to swap it onto my bike, but now I'm just thinking I will find a K motor to overhaul and do all the trick things I want to do...

I don't remember you ever mentioning, what chain/sprocket setup are you running on your bike? I just ordered a setup to conver to a 530 chain with a slightly taller gear ratio(3.0 instead of the stock 3.07). So I'm curious with other F riders are running.

tweakin · « **Reply #433 on:** April 26, 2011, 07:23:00 PM »

915 kit showed up so I boxed up the trans, crank, cylinders, super rods, and 915 sleeves and sent them of to Jay @ APE to work his magic. Now I just need to find the cash to pay MRieck for the head work to be done.

jaguar · « **Reply #434 on:** May 01, 2011, 11:40:13 AM »

still not sure about why some guys "mix and match" K and F parts in hot rod motors.

tweakin i was gunna stop over here and see if i could talk to you into doing a stroker motor....but i guess your well on your way to another fun motor

tweakin · « **Reply #435 on:** May 01, 2011, 05:55:05 PM »

I gave a lot of thought to a stroker.... but felt the 915 would be good enough for my application.

Quote from: jaguar on May 01, 2011, 11:40:13 AM

still not sure about why some guys "mix and match" K and F parts in hot rod motors.

tweakin i was gunna stop over here and see if i could talk to you into doing a stroker motor....but i guess your well on your way to another fun motor

HedNut · « **Reply #436 on:** May 03, 2011, 05:01:42 AM »

Ooooooo... this is cool!! Can't wait to see how this comes together!

Well Done!

cheapride · « **Reply #437 on:** May 06, 2011, 09:05:17 AM »

Hey tweakn I like the build. I must have missed the problem with your first head. What issues did you run into to send it out to APE again? Did you consider the cycle X 836 or did you just prefer the dyno man kit?

Thanks,
Brent

tweakin · « **Reply #438 on:** May 06, 2011, 10:29:35 AM »

No major problems with the head I was never 100% confident with my skills at rebuilding it so I sent it to one of the experts. Cycle X makes some nice piston kits, I have one of there 915 kits for my engine build. I just like the Dynoman kit better at the time.

Quote from: cheapride on May 06, 2011, 09:05:17 AM

Hey tweakn I like the build. I must have missed the problem with your first head. What issues did you run into to send it out to APE again? Did you consider the cycle X 836 or did you just prefer the dyno man kit?

Thanks,
Brent

tweakin · « **Reply #439 on:** May 14, 2011, 06:23:51 AM »

Little ride video from yesterday with forum member brandEn.

2 cb750f's

brandEn · « **Reply #440 on:** May 14, 2011, 11:22:50 AM »

Nice, what your editing doesn't show is me cussing like a drunkun sailer when my bike coasted to a stop at the end.

FunJimmy · « **Reply #441 on:** May 14, 2011, 01:01:53 PM »

Congrats, you lucky SOB’s. That’s a great vid.
Which roads are the nice twisty secondary routes, and what are you using for video equipment?

Branden, nobody could tell you coasted to a mechanically induced stop. What was it?

Cheers
FJ

tweakin · « **Reply #442 on:** May 14, 2011, 01:45:11 PM »

I left the part out to protect the innocent...

Quote from: brandEn on May 14, 2011, 11:22:50 AM

Nice, what your editing doesn't show is me cussing like a drunkun sailer when my bike coasted to a stop at the end.

tweakin · « **Reply #443 on:** May 14, 2011, 01:48:24 PM »

Thats on Dash Point road. It kind of a cut off from Federal Way to Tacoma. Some good road but in most parts the speed limit is 35 and it's heavily patrolled by the men in blue.

I am using a GoPro HD. The location of the mount on my bike wasn't the best so it vibrated and effected the quality of the shot and I am still learning how to edit. I edit with basic Imovie on my mac.

Quote from: FunJimmy on May 14, 2011, 01:01:53 PM

Congrats, you lucky SOB’s. That’s a great vid.
Which roads are the nice twisty secondary routes, and what are you using for video equipment?

Branden, nobody could tell you coasted to a mechanically induced stop. What was it?

Cheers
FJ

brandEn · « **Reply #444 on:** May 14, 2011, 04:41:37 PM »

My carbs were leaking bad out of the #3 air jet. After limping home I found a piece of cotton insulation looking material about the size of a pea under the float valve seat. I may have had an intake leak as well. Just spent the day wrenching and took it for yet another shake down run and its running great again. I put new intake rubbers on cleaned the carbs and changed oil along with a carb sync.

tweakin · « **Reply #445 on:** May 18, 2011, 04:54:15 AM »

Here is a video I had to take for insurance purposes.

1977 cb750f

bigtexan449 · « **Reply #446 on:** May 27, 2011, 05:10:41 AM »

Quote from: tweakin on July 17, 2010, 04:03:40 PM

Almost completed. I oiling it up tonight and will fire it up in the am. I still need to redo the seat I made because it looks like ass and work out the license plate location due to possible clearance issues. But here it is.

What seat cowl are you using? very sharp bike man!

tweakin · « **Reply #447 on:** May 27, 2011, 06:28:14 PM »

Quote from: bigtexan449 on May 27, 2011, 05:10:41 AM

What seat cowl are you using? very sharp bike man!

here you go

http://www.airtech-streamlining.com/vintage/vintageseats_round.htm

Scroll down to the long F2 seat cowl, thats the one.

Zaipai · « **Reply #448 on:** May 27, 2011, 07:15:25 PM »

Great images Tweakin..Fantastic Build...

.: Scott :.

oldhondarider · « **Reply #449 on:** May 29, 2011, 08:47:46 AM »

Quote from: tweakin on May 14, 2011, 06:23:51 AM

Little ride video from yesterday with forum member brandEn.

2 cb750f's

Awesome!

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Author Topic: 1977 cb750f2 (915cc) (Read 240720 times)