Topic: CB750F3 cafe build

[Grabcon]

I am curious with 0.060" milled off the head as to what 836 pistons you are going to run and what cam? Are you sticking with the stock cam or have you gone with a performance grind? and if so what one?

[KJ790]

I am curious with 0.060" milled off the head as to what 836 pistons you are going to run and what cam? Are you sticking with the stock cam or have you gone with a performance grind? and if so what one?

I am using the flat top 836 pistons off ebay in this engine (the ones meant for a K model). This is why the compression ratio is just a hair under 10:1 after shaving off the .060" on the head. As for a cam, I have the stock F cam that came in it for now. I was thinking about putting a Web 41A cam in it, but I'm trying to keep the total cost of this bike under $1500, so I'm sticking with the stock cam for now.

[Grabcon]

The pistons off eBay. Are these the $110 ones from Japan? Included in the kit, pistons, wrist pins, rings, head gasket and clips?

[KJ790]

The pistons off eBay. Are these the $110 ones from Japan? Included in the kit, pistons, wrist pins, rings, head gasket and clips?

Yup, those are the ones. I'm not using the head gasket that came with it though, I opted for an MLS head gasket instead.

[Grabcon]

PM Sent

[KJ790]

It's coming along now. I got the engine back in the frame, got the carbs rejetted, cleaned up, and back on, and the gauges all done. I still need to finish putting in the stainless steel hardware in the engine, make some aluminum wheel spacers, and make my rear sets, but I think this thing is all down hill from here.

[KJ790]

Alright, I managed to get a little more work done before I had to leave for a week in California. I just got back from Cali and finally uploaded some new pics.  I machined up some aluminum wheel spacers and anodized them red. Then I made up some rear sets out of aluminum and stainless steel. I anodized all of the aluminum pieces black or red.







Can't wait to get this thing finished!

[KJ790]

I got the rear sets on and got the engine to run. It sounds awesome with the exhaust I made. I still need to do some tuning to the jetting, but I have to wait until I get the air filters that I am going to run. Here's the first outdoor pics:

[Killer Canary]

I'm not a big fan of white but your paint scheme works. I hear you on the paint curdle and having to sand! Did you say anywhere what the plans are for the other F3?

[KJ790]

The other F3 is going to go up for sale once I get some time to clean it up a little. I was thinking about using the engine for another build, but I doubt I will. If I can't sell it then I will just have to do something with it 

[KJ790]

Alright, progress has been slow, but I'm finally getting there. Got the seat mounted, just need to make a seat cushion. I bought a tail light, but I didn't like how it looked, so I just ordered a different one. I got a new front fender and painted it black, though I may need to add a little white to it. Here's how it stands now:





I also threw on an old black side cover just to see how it looks, but I think I like the look of the white better, especially once I get the "750Four" emblems on there.



Now I just need to decide if the black front fender looks out of place or not... perhaps a bit of white up front would pull the bike together a little better.

[KJ790]

I realized I never updated this thread with the finished product. Here it is just after the first 1000 miles were put on. I've been riding it almost every day this summer.







I got sick of the loud noise of the straight through exhaust, so I have put a muffler on it now. I will have to take some updated pictures when I get a chance.

[70CB750]

Looking great!  Thanks for posting final pictures.

[KJ790]

Got a couple thousand miles on her now. I retrofitted a silencer made for a sportbike onto it to quiet it down a little, my neighbors were not too happy when I would leave for work in the morning