Author Topic: 836 down for the count (Read 5365 times)

Sprocketwerx · « **on:** March 10, 2013, 08:23:25 am »

As mentioned in a few other threads, I pulled down my '72 836 and found 3 wiped cam lobes, very worn rockers, seized wristpin on #4 and the rest were tight in the piston, but came out with a light drift hit. Bent #4 like a banana drifting the pin out.
Cylinders prob won't clean up with a hone so at least an 850 kit, I'm thinkin I want more!
Need rods, pistons, rockers (not sure how many are wasted and $65 each for refacing @ Webcams is a bit pricy for me.
Webcam told me about $130 to hardweld and grind my 63A cam if the rest of the cam is good.

For now, given the season, I'm gonna throw my '78K in the chop just to get on the road, working on an EFI manifold similar to the POSA piece, with injectors in each runner and a single throttle body and fed by a turbo.
I have the material for the manifold, a wide assortment of injectors from modern sportbikes, Microsquirt controller, and waiting on a box of tubing bends for header.

Meanwhile I'm still looking to build up the parts I need to put the NA motor back in service.
So my wish list is:
bigger bore kit
super rods
rockers

Since I'm splitting the cases, might as well replace the primary chain.
Cam chain was part of the original freshen up.

Doncha just hate when a simple ring and hone turns into a major rebuild?

Big Jay · « **Reply #1 on:** March 10, 2013, 11:03:43 am »

What kind of pins were they?

Sam Green Racing · « **Reply #2 on:** March 10, 2013, 11:28:36 am »

save $11 (each) on rockers over having them resurfaced.

http://www.davidsilverspares.com/CB750K0-FOUR-1969-1970/part_7719/

Sam.

Sprocketwerx · « **Reply #3 on:** March 10, 2013, 12:39:34 pm »

No markings on the pistons, plastic/nylon buttons retain floating pin.

http://s1165.beta.photobucket.com/user/choppersprocket/library/Blue%20#$%*%20836%20rebuild

Edited to repost the link. This is the whole album, enjoy...lol

BLUE71TURBO · « **Reply #4 on:** March 10, 2013, 12:47:28 pm »

Your photobucket pictures are not working........

Sprocketwerx · « **Reply #5 on:** March 10, 2013, 02:49:08 pm »

Hope that worked

Medyo Bastos · « **Reply #6 on:** March 10, 2013, 03:52:40 pm »

those look like powroll pistons and stock rods to me...

Sam Green Racing · « **Reply #7 on:** March 10, 2013, 05:43:30 pm »

Still not working for me and the name Powroll makes me cringe.
Welcome Medyo Bastos.

Sam.

Medyo Bastos · « **Reply #8 on:** March 10, 2013, 06:15:15 pm »

thank you for the warm welcome mr green! i have been reading the boards here for several years, just never posted...

my attributes on this site will not allow me to post links. i googled: photobucket choppersprocket and found his folder

Sam Green Racing · « **Reply #9 on:** March 10, 2013, 06:40:35 pm »

I'm not sure why you can't post links, try contacting our admin via PM, Glenn may be able to help you.
http://forums.sohc4.net/index.php?action=profile;u=1

Sam.

Sprocketwerx · « **Reply #10 on:** March 11, 2013, 06:34:27 am »

I talked to the guy that built the motor in '76. He said he was using a lot of Powrall kits with a few Weiscos in the mix, so prob Powrall. Thanks for the ID Medyo, I've been looking for pics of them to compare, can't find anything that old from Powrall.

Definitely stock rods, I have the invoice and it only said 836 kit, a few valves and a set of springs to go with the cam. Barnett clutch still hooks up!

I guess if anyone has a need for a few Powrall pistons, I got 3!
Although Kate @ Cycle One told me that Powrall has no rings in stock.
Edit to add: Phil's Cycle shop in Waterford MI says he can match up rings in stock.
He built the motor, delivery date 6-1-1976.

Makes ya cringe or not, this motor ran strong up to the moment I pulled it out. 36 years, unknown miles, a lot of abuse over the years. It's been my daily driver for the past 6.

I have no clue why the links are being corrupted, they work when I post but next day, error. I'm just copy pasting the link from address bar.

Bill/BentON Racing · « **Reply #11 on:** March 11, 2013, 01:53:14 pm »

Got rockers, new and used.

PM me......trade for exhaust.....maybe?

Bill

Sprocketwerx · « **Reply #12 on:** March 12, 2013, 05:40:44 am »

Sounds like a plan Bill.
I got your addy and will get the pipes out in the next week.
We can work out the details, there's not a big rush on my end as I can't afford the rods and another big bore right now.
Rockers would be great, one step closer.

Sprocketwerx · « **Reply #13 on:** April 13, 2013, 11:31:12 am »

So I yanked a stock 63xx original miles '78K motor and hung a turbo out front.
Pipes are next, then intake side. carbs or EFI, still not sure, I have both.

http://s1165.photobucket.com/user/choppersprocket/media/20130401_205859_zpsca2ddc16.jpg.html?sort=6&o=3

Bill/BentON Racing · « **Reply #14 on:** April 13, 2013, 02:00:10 pm »

Sprocket,who's is this? Very nice!!! your new build looking good,may have rods and 970cc RC big bore pistons only.I'll let you know,Bill

My bro's Arlen Ness 836 low rider looked kinda similar,but not the BLING!!!

kghost · « **Reply #15 on:** April 13, 2013, 02:11:10 pm »

Say hi to phil for me.....I used to walk in and buy stuff from him when I was up there

Sprocketwerx · « **Reply #16 on:** April 17, 2013, 09:09:00 am »

Quote from: Bill/BentON Racing on April 13, 2013, 02:00:10 pm

Sprocket,who's is this? Very nice!!! your new build looking good,may have rods and 970cc RC big bore pistons only.I'll let you know,Bill

My bro's Arlen Ness 836 low rider looked kinda similar,but not the BLING!!!

BSH magazine around '08. Centefold feature bike.
the guy's name is Steve Kingham of West Yorkshire, UK.
The gold inlays and engraving (ALL engraving by hand) are incredible.
I have another friend that was looking for one of those tanks so I sent him a pic

1000cc RC motor with Yoshi internals. RayJay turbo, bendix carb Joe Hunt mag...
I'll try and get pics of the whole article and post another thread.

Bill/BentON Racing · « **Reply #17 on:** April 17, 2013, 09:42:11 am »

Please,sold a Joe Hunt mag like that years ago.Nice work!! Bill

Medyo Bastos · « **Reply #18 on:** April 17, 2013, 04:41:23 pm »

i have that article somewhere as well. i have some 24k plated parts that i have had in hiding for several years if you are looking for some

i may part with them, this motor i am working on is starting to get pricey...

Bill/BentON Racing · « **Reply #19 on:** April 17, 2013, 05:40:06 pm »

What you got, my bro's 836 had Brown's gold plating! The price list for gold was short, 5 words....
TWICE as much as chrome!

Bill PM me, thanks, Bill

Turbogrimace · « **Reply #20 on:** April 17, 2013, 06:38:11 pm »

Sorry to hear about your troubles Dan. I'm in the same boat. If you need some parts let me know. I probably have a pile of rockers sitting somewhere. That and a daytona cam I'm 86-ing. Though I wouldn't recommend thst for your rig since you like to tow with it

See you at the roost this year?

Bill/BentON Racing · « **Reply #21 on:** April 18, 2013, 03:58:28 pm »

Dan, got the pipes, thanks Bill Ship rockers next week. You want 4 new ex or in, ot 8 used ones? Or the RC 970 pistons.

754 · « **Reply #22 on:** April 18, 2013, 04:06:12 pm »

You ate some camlobes.. So did I on a 25 years together 836.
Did you have any sticking guides, I did but it may have been caused by my high exhaust pipes making it hotter.

.I did find that the o rings on the oil supply stud area deformed a bit, and lt may have changed oil flow. ..lost a couple lobes on my beloved RC 315 .

Sprocketwerx · « **Reply #23 on:** April 18, 2013, 05:13:59 pm »

754... the 836 build was delivered 6-1-76. Not a bad run, and I ran the last few seasons hard.
Haven't disassembled the heads beyond cam towers, as I gotta get the bike back up as a priority. The big bore NA motor has to wait for $$$ and I don't want to take shortcuts.

Bill, I gotta think a minute there, didn't realize you still had the pistons

I like displacement

Do you know the compression?
I'll give you a call in a few days, wife's car lost a cylinder (she works 75 miles away, I had to drive her today) and my mind is too full...lol

Bill/BentON Racing · « **Reply #24 on:** April 18, 2013, 05:30:35 pm »

K, you could just take the rod and piston out like the 350F my General Mgr took on trade.The look on his face when I told him his fouled plug was fouled alright......That's a $1.79, you really want to know what it'll take, sorry boss no profit on this deal.....didn't I tell you to let me check it out, remember your 5 speed supposed to be 6, CB650SC 83? He didn't buy lunch that day either.Surprise.
Good luck on wifes vehicle, more important than ours!

Bill

Sprocketwerx · « **Reply #25 on:** May 20, 2013, 03:56:13 am »

Been a while since posting here.
The '78 motor is in and running fairly well, need to mod the air bleed (plug the hole up the middle) to get a bit finer adjustment.
I have the old roundtops on now, 120 main, 40 pilot, pods and free flowing exhaust.
It will idle with air bleeds fully turned in...lol

Anyway, turbo is apart for detailing and polishing the compressor housing. Did a bit of porting to the inlet of the turbine for a smoother entry.

I've decided to follow Bamboozler's blowthrough carb setup using the stock keyholes.
Need some more soda to blast the bodies and floatbowls, I'm liking the results!
Ordering o-rings today, fuel pump and VR on the way, not sure if my wallet will buy a new Aeromotive boost referenced regulator, but racerheads always find a way!
Need to order some aluminum mandrel bends for the turbo plumbing and airbox, and I have everything I need for the header and downpipe.

Bill/BentON Racing · « **Reply #26 on:** May 20, 2013, 11:21:10 am »

K,and 970cc RC pistons go out tomorrow,and 4 rockers,thanks again for the pipes,Bill

Sprocketwerx · « **Reply #27 on:** May 21, 2013, 01:01:59 pm »

Thanks again Bill, you fueled the need or more cubes, it prob woulda been cheaper just bumping to 850, but... go big or go home

Workin on sourcing sleeves, either CycleX or another friend said he might have some if he didn't trade them away...lol
Not in a hurry, this will be my winter motor build, just collecting parts and drooling.

Sprocketwerx · « **Reply #28 on:** June 03, 2013, 05:10:25 am »

Should have some sleeves in a few weeks (CB900F)
OD measures 74mm, 2mm walls should be fine for a street motor in a chopper

Intereestingly, the stocker '78 motor is tearing it up, buddies I was riding with yesterday said it seemed quicker than the old 836. I got no speedo so I don't know, but she'll pick up the frontend on 1-2 shift

And it's not exactly wheelie bike material, long springer, long low rigid frame. Roads suck around here so I'm a li'l scurred to open up and keep it open, springer is too bouncy on our FUBAR roads in MI.

Bill/BentON Racing · « **Reply #29 on:** June 05, 2013, 06:52:49 pm »

Dan,they should be there tomorrow.Let me know if all ok? Bill

Turbogrimace · « **Reply #30 on:** June 06, 2013, 03:57:43 am »

Get ready fo da ROOOOST!!!

Bill/BentON Racing · « **Reply #31 on:** June 06, 2013, 07:37:06 am »

With boost?

Bill

Sprocketwerx · « **Reply #32 on:** June 06, 2013, 09:11:48 am »

Bill, I'll be lookin

Grimmace, No boost yet, but the stocker is kickin more ass than I expected.
Rather ride than build right now

Long ass chop pick up the front on 1-2 shift.
Our 2 lanes suck so I'm scurred to open up on the 2 lanes for too long, even highway bounces you on overpasses. Not good on a pogo-ing springer. I need to work out a damper that's not ugly as sin.

Just got freed up enough to finish the carbs for turbo. Need to soda blast, final clean and assemble.
Turbo is apart for polishing and painting the hot section in my trademark flat blue

Also need to get a fuel pump and scavenge oil pump for the turbo.
I'll knock out the fab work after the roost and hopefully have it ready for the BBB meet in Muskegon, MI.

Turbogrimace · « **Reply #33 on:** June 06, 2013, 09:26:48 am »

ROOST, not boost. See you in June!

Sprocketwerx · « **Reply #34 on:** June 06, 2013, 09:42:57 am »

Oops, yeah it was Bill that asked if I'd have boost for the Roost

So with pistons and sleeves for the big bore, the next big items I need are rods and cam.
Rods will be super-rods unless I can find a killer deal on some goldenrods

Cam, I'm still undecided. The 63A was nice in the 836, but since I trashed it, might step up a little. I'll be doing some light porting, valve job if nothing is damaged or bent, APE springs.
Any suggestions? and why

That leaves new primary and cam chains... just because, adjustable cam sprocket, gaskets and sundries.
Will be a winter build, but I need to tear down the lower end and blast the cases and cylinder block before cold sets in. My blast cabinet is in an outside shed to keep grit out of my machine shop.

And YAY, the post came while I was typing this and my goodies have arrived!
Thanks again Bill! Now get those pipes on and take some pics of Tiger!

Medyo Bastos · « **Reply #35 on:** June 06, 2013, 02:37:34 pm »

i just sold wino a set of golden rods. hit him up, he is in your backyard!

Sprocketwerx · « **Reply #36 on:** June 07, 2013, 12:20:32 pm »

Yeah I know...lol, I saw the post the day after he committed

News:

Author Topic: 836 down for the count (Read 5365 times)