Topic: Cobra motor disassembly and rebuild

[754]

   Loctite. Won't prevent shearing,  so did they work loose?  Solid mount?  What wheel?..what size? What bolt pattern?
Time to go to studs, I am thinking.

[MRieck]

POP's,  the late BP head....went to Mike Rieck for new guides and seals, also sent new SS valves,  we used Kibble white intakes, back cut by Rick Stetson, along with a Rick Stetson, decked head and new Serdi valve job.Also new springs etc.  It should be FINE! And yes it's dead level, I checked!  Lol, Bill

Yes.....it is as good as it can get.

[dragracer]

   Loctite. Won't prevent shearing,  so did they work loose?  Solid mount?  What wheel?..what size? What bolt pattern?
Time to go to studs, I am thinking.

Let me clarify. Its likely the bolts worked loose due to a lack of loctite. Once there was enough threads exposed, as the wheel turned the bolts snagged the swingarm and  sheared off. Haven't had a chance to pull the bike out of the trailer yet as the rain came down when I was moving stuff around to get it out. Much needed rain for the garden so I'm not complaining. Hope to have it repaired by the end of the week. Memphis is the following week I think.

[754]

Bill have you weighed any of the bikes?

[dragracer]

I think he said the 1080 motored bike was 395 in Valdosta but I know he reweighed it in Rockingham. Unsure of that number.

[Bill/BentON Racing]

It weighed 405 in Rockingham with starter motor and pieces. But have a lighter rotor coming, thanks to George Schuld and Mike Rieck.  Also removed some things like volt meter, oil temp gauge etc. I want 395-399! Just finished it around 4:20! Finally I think I got one that's ready and right!  We'll see Friday night. It's the best so far for me. Thanks,  Bill

[dragracer]

And let the church say: Amen!!

[MCRider]

And let the church say: Amen!!

What I say!   

[kmb69]

Glad to see shocks on the rear!     

[Bill/BentON Racing]

Thanks, it might be next Friday for Test n Tune. Next Wednesday or Thursday supposed to be dyno. Woke up to no A/C, so it takes precedent over most all else! Lol,  Bill

[dragracer]

Thanks, it might be next Friday for Test n Tune. Next Wednesday or Thursday supposed to be dyno. Woke up to no A/C, so it takes precedent over most all else! Lol,  Bill

Not good for the AC to be out in the south while we're going through 100 degree days. Hope all works out. I had to buy two small window units a few years ago to get us by for several days til the repairman could get the job done. Worked out well once unused rooms were isolated. Plus I was able to remove the units and donate them to a local community center that needed them to cool the seniors and children. Took a tax credit for a donation to charity so all worked out well.

[POPS 911]

Damm BILL : Congratulation on that 10.30 ET with that COBRA HEAD MOTOR, I thought you said you were going with a BUTCH PACE head ?? That will be a new record for SEL at MAN CUP for a SOHC 750 HONDA. With the DA at Memphis being 250-400 and the tail wind that track is famous for then that bike will be 10. flat on the cool night passes.

[dragracer]

Damm BILL : Congratulation on that 10.30 ET with that COBRA HEAD MOTOR, I thought you said you were going with a BUTCH PACE head ?? That will be a new record for SEL at MAN CUP for a SOHC 750 HONDA. With the DA at Memphis being 250-400 and the tail wind that track is famous for then that bike will be 10. flat on the cool night passes.

I guess Pops and I may be the only two people on this forum that have no clue as to who BuTch Pace was, or is. Can someone give us a run down please?? I never professed to be a SOHC guru so I'm totally lost on this famous persons identity.

[Bill/BentON Racing]

First, POP'S,  that's my first goal! I think it can run that though and better.  Butch Pace I first met in 1977 at the first IDBA meet, same with Terry and Byron, we just talked in the staging lanes. Russ didn't come. But Butch Pace did.  He cleaned up. He was RC's Midwest distributor! Privy to porting, boring, pretty much most everything.  So a Butch Pace head was a whole lot like a RC one.  He was a performance enthusiast until he passed, Bill
Oh its not coincidence that that would be a new record if I can run it! Lol. 

[gschuld]

Butch Pace owned Pace Kawasaki.

He was from Edwardsville, Illinois.  He held the Competition Elimination record in 1975 for A/A.

Set 11/1974, 10.19 sec 135.98mph with an 1162 cb750.

Like Billy said, Russ Sr. chose him to be the Midwest distributor for RC.  I have a good example of both a Butch Pace ported head and an RC ported head.  Mike Rieck extensively rebuilt both for me and would be the best judge for comparing the porting, but from my untrained eye, they sure look similiar

George

[gschuld]

This, for example is my Butch Pace ported head.  It was originally ported to match an 836 (it was custom stamped "Butch Pace 836")

This head got an upgrade to the 33.5 intakes and the chambers opened up to match a big bore piston/cylinder set.

Naturally, Mike worked his magic on this head and it got new guides, valves, springs, ti retainers, etc.

And, BTW, Jim French worked his magic on chamber #4.  This head suffered an apparent broken rod in anger, which left a perfectly circular piston shaped indent into the #4 chamber.  Jim fixed her up and sent it to Mike for the rest.

Thanks guys.....

George

[gschuld]

George

[dragracer]

George

Mike and Rick did a jam up job on that head. Its too darn pretty to go on an engine. I'd just build a glass case and put it on a shelf for display. Yeah, I know, I lied. Straight on the biggest engine I could build it would go!!!

[gschuld]

George

Mike and Rick did a jam up job on that head.

Straight on the biggest engine I could build it would go!!!

Fully agree on both comments

George

[Ericcb750]

That head is beautiful. I am a rookie when it comes to the hot rod Honda thing but I got my parts (head, cylinders, crank, rods, etc) from Mike a little while back...It truly is freaking amazing, It is super cool to see it next to a stock head. I only have a Stage 2+ but man, that thing is flawless. I cannot wait to run it and compare the ported 836 wiseco with Webcam 63A to my stock 736. This Cobra motor looks like an absolute beast.

Just want to thank everyone here for teaching me so much about these engines and bikes and give a shout out to Mr. Rieck...he's the man, Wicked cool guy and treated my stuff like it was going in his personal bike...Took the time to explain everything to me .... I know my face is going to hurt after breaking that motor in from the #$%* eating grin I'll have on...

[Bill/BentON Racing]

+1 , what you said!  We hope it's a beast!  Dyno next week, keep us posted on your build and g'luck,  Bill

[Ericcb750]

Thanks Bill, I appreciate that. It's my first hot rod honda so excited is an understatement. I'm used to running my sportster so even the stock 736 gets boogy'n pretty good above 5K.... My Sporty would be ready to explode where the Inline 4 is just waking up...ha-ha.

Here's what I've got so far, I'm going to do a build thread too.
 836cc Wiseco 10.5;1
 Stage 2+ JMR ported head (oversize intakes), new hd springs, guides (iron), early retainers, cycle x super flow valves
 Cycle X Super Rods (couldn't afford the Carillo's) - they're really nice
 WebCam 63A
 Balanced Crank
 Classic Cycle City HD Primary Chains
 HD Cam Chain (wish I had bought a couple Tsubaki's years ago)...
 New Tensioners (primary) .... I still need to order my cam chain tensioners
 APE HD Studs (both Cylinder and Main bearing)
 APE Clutch
 Dyna Ignition - still have to get the 0.5 ohm coils and new wires though... no biggie
 Going with completely re-built stock 657B carbs ( have a whole bunch of different jets)
 Moto Gpwerks stainless exhaust
 K&N Pods
 
 Have to measure my crank and rods for the bearning shells, so a few more things to iron out but i'm almost done gathering parts, time to start building!!!

   Also piecing together a full GSXR Front setup - galfer wave rotors.... the whole schebang... Pretty much trying to re-build my 78K the way I should have originally... The first time around was a learning experience. This is hopefully going to be a good sleeper.....Give some modern rice a run for their money (maybe)...

That Cobra Motor is pretty Sweet Bill.... What is the size of the Cylinders ( sorry don't know too much about them)... i love that plate on the valve cover. I've watched your You-tube videos and that thing (both the black and purple rain one) sound like a beast!!!!

Do you recommend using a valve cover with the cam tower supports? I've seen them on Kenny's site and i honestly think they look so cool so that's worth it alone.... I want this motor to be a very strong runner and hopefully as reliable as possible so I thought it may be a good idea. I'll have to look into some better carbs down the road too, I'm hoping my stockers when jetted properly should work ok.
 

[Ericcb750]

Here's a couple photos...Sorry not trying to Thread Jack you Bill...

[Bill/BentON Racing]

It's cool and so is your build. I like the cam cover for the cool factor! Needed? Nah, not really, sure doesn't hurt though. It won't be the sleeper if a knowledgeable person sees them either, but they so cool. Also I like the old school welded covers ,bit I admit I haven't tried one of the newer style ones. Keep us posted and G'luck,  Bill

[POPS 911]

I can't wait for Memphis to see the PACE or THE COBRA HEAD put numbers on the board = with that DA and maybe a cool night run and a tail wind maybe BILLY BLING will have a good day at the track [ or night run ]. I would think that two batteries would be need for a high point motor, remember your hurt leg at Valdosta kick starting.   In 1977 was that Butch bike a bar bike with a slick that ran 10.19 at 136mph ?  Blinkster IS A NO BAR BIKE with a Shinko street tire, 395 pounder scale weight AND WITH ALL THOSE HIGH DOLLAR PARTS should run 10 flat in 1320'.