Author Topic: Terry's Half Arsed Fake K0 K2 Rat bike project.  (Read 3167 times)

0 Members and 1 Guest are viewing this topic.

Offline Terry in Australia

  • Really Old Timer ...
  • *******
  • Posts: 33,281
  • So, what do ya wanna talk about today?
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #25 on: March 25, 2021, 04:57:21 AM »
Very true, Bill. Well I've just spent the last 3 days trying to quieten it down. I can honestly say, what a turd of a job! The megaphones were empty of any baffles that I could see, except for a 6mm thick "washer" welded (poorly) into the tail pipes, maybe to increase the back pressure?

K0 bitsa Monday 22 Mar 2021 by Terry Prendergast, on Flickr

Now my first instinct was to remove the washers, which were tack welded into the back of the pipes, but it was too much of a PITA, so I decided to "Bore them out" instead, so that I could fit a length of perforated exhaust tube wrapped in fibreglass exhaust packing and somehow secure it to the exhaust. I have a huge 6-60mm step drill which is really only meant for mild steel, aluminium etc, and I found out very quickly that the "Washers" were more than likely stainless steel. the holes were around 25mm, and to take them out to approx 50mm, it took around 2 hours for the first hole, which included my big arsed Bosch drill occasionally grabbing and rotating 180 degrees, almost breaking my wrist, and at one stage crushing my right thumb betwixt the drill and the bike's rear wheel rim. Fcuk it hurt.

Fake K0 Wednesday 24 Mar 2021 3 by Terry Prendergast, on Flickr

Not my worst injury ever, but the fcuker throbbed for the rest of the night. Due to my medical issues, I can't take anti inflammatory drugs, but in this case I made an exception, Tramadol wasn't working, so I found some Celebrex capsules and took one before I went to bed, and in the morning it was only sore.

Next day I cut a piece of perforated tube, used a hole saw and my poor suffering step drill to make another "washer" from 3mm plate, and tack welded them together.

Fake K0 tinkering 23 Mar 2021 6 by Terry Prendergast, on Flickr

I wrapped it in the fibreglass packing, and as the outer hole was very tight, wrapped it in masking tape so I could get it thru the hole.

Fake K0 Wednesday 24 Mar 2021 2 by Terry Prendergast, on Flickr

Now my cunning plan was to drill and tap a couple of holes through my "washer" and the "washer" that was welded to the pipe, but after breaking my tap drill, I settled on 4 x 5mm long pop rivets instead. I could have welded them, but not knowing how the "baffles" would effect the performance or sound, I wanted to be able to remove them again if needed. I also slopped in some Wurth high temp silicone sealant to help reduce any vibration, rattling etc, as a rattling exhaust is a fools frustration, according to Maxwell Smart, from memory.........

Fake K0 Wednesday 24 Mar 2021 4 by Terry Prendergast, on Flickr

So that was one side. The next day (yesterday) I had to drill the hole on the left side. By this stage my step drill was so blunt it took almost 4 hours of drilling, grinding, sanding, weeping, swearing, gnashing my teeth and more weeping, until I'd achieved the aim. I cut another washer, (by now my step drill was almost dead so I had to enlarge the hole in my lathe, then welded it to another piece of tube, wrapped it in fibreglass packing, and shoved it up the hole. I bent my first 5mm drill bit which pissed me off, but I had another one, and managed to drill the holes, slopped in some more high temp silicon sealant and did the pop riveting thing.

Fake K0 exhaust 23 Mar 2021 3 by Terry Prendergast, on Flickr

I cleaned it with acetone, which immediately found every cut on every finger, then I sprayed some good old Rustoleum satin black on the new baffle plates to camouflage my redneck rework. I fired it up, and was happy with the result.


Thank God for that. I've just ordered another big arsed step drill, but I hope I never have another job like that, it wasn't just mind numbing, it was painful. Apart from my thumb, I almost broke my wrists several times when the bit grabbed and spun me and the drill around @ 500 revs. I was so tempted to just forget about it and buy another Delkevic, but I kind of like that old 4 into 2, so I persevered, and am happy with the result, but never again.

I did take it for a sneaky ride around the block at lunchtime, and discovered several other issues. It has either loose or buggared steering head bearings that are very obvious when you apply the (now working again) front brake, and a rear brake that jams on when you apply it, and won't release until you rock it back and forth for a few minutes, what a PITA. Of course both tyres are absolutely shot and there wouldn't be 10 psi in either of them, so it was a very cautious ride, but I did give it the berries on the straight sections a couple of times in 1st and second, and it's got plenty of power, so that was good.

I had more parcels arrive for the K2 bitsa, so I moved some bikes around between showers (it's been raining on and off all week) and parked the old rat in the garage so I had some space to work on the bitsa. More later. ;D

Fake K0 exhaust 23 Mar 2021 4 by Terry Prendergast, on Flickr





 
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 9,816
  • 1969 cb750
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #26 on: March 25, 2021, 07:12:53 AM »
Terry..... I think getting a frame from Toronto to Florida is way more than it’s worth. I’m guessing $3-400. I’ll check and confirm. Something from the S.E. USA would be much less.

Ha ha, sorry John, different John. "Just John" offered me a frame, and he's in Georgia. ;D

Terry, I have a spare 71 frame CB750-108xxxx if you are interested.  It is in Atlanta, GA.   Depending upon where your Florida shipper is located I may also be able to deliver it to the shipper.

Regards,
John



OK! Good Luck.

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,529
  • Bike almost back to the 70's 2015
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #27 on: March 25, 2021, 09:28:08 AM »
Look good Terry!
You might have found the recipe for a power increasing exhaust! ;D
Your bikes are really built with blood sweat and tears!!

"Terry bikes", they have your DNA and will run as raping monkeys! ;)
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,091
  • I love to restore & travel. Keep'em Going Strong !
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #28 on: March 25, 2021, 10:10:29 AM »
Look good Terry!
You might have found the recipe for a power increasing exhaust! ;D
Your bikes are really built with blood sweat and tears!!

"Terry bikes", they have your DNA and will run as raping monkeys! ;)

Lol  ;D
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,091
  • I love to restore & travel. Keep'em Going Strong !
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #29 on: March 25, 2021, 10:12:45 AM »
Terry,those hardened steel(SS?)washers welded onto the ends of those pipes.. What a PITA and some cursed parts to struggle with for you:you fought them for many hours and won. I would hate to need to deal with those,would rather consider removing them.
« Last Edit: March 25, 2021, 01:13:11 PM by grcamna2 »
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #30 on: March 25, 2021, 12:31:34 PM »
I'm sure that acetone DID find every cut in your fingers!!
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,293
  • SOHC4 member # 2605
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #31 on: March 25, 2021, 01:00:03 PM »
Yeah, hate messing with acetone because you definitely find any and all cuts and the stripping oil from your skin isn't fun.  Almost as bad a messing with bleach stripping the fat or oils as well.

The washers remove nd me of that Snuf-not or something like that which was a washer that spun on a post you would use on open pipes to switch from drag race mode with them not blocking the pipe outlet but when you needed to be quieter so Johnny Law wouldn't hassle you turned them 90 degrees so they looked like large washers reducing the outlet and quieting the exhaust some.

Glad you got them fixed. Too bad ya couldn't easily attach the drill to a rig that allowed you to adjust the angle and height needed and be setup to where you could stand on this frame to keep from breaking your wrists and then a lever or you bend over to push it forward. Sliding trolly the drill is attached to and bearing/bushing rails it slides on as needed.
Probably failing miserable in describing...
Few laser projections from a bore sight style laser you could rotate and adjust how far from chuck center, so you could figure out if it is drilling at the right angles.

Glad you are progressing....
David- back in the desert SW!

Offline Terry in Australia

  • Really Old Timer ...
  • *******
  • Posts: 33,281
  • So, what do ya wanna talk about today?
Re: Terry's Half Arsed Fake K0 K2 Rat bike project.
« Reply #32 on: March 25, 2021, 04:48:11 PM »
Thanks guys, and David, I do understand your Idea, it would work well, but building a rig like that would add more time and complexity that I didn't want to give it as I'd probably never need to use it again.

I actually thought about cutting the pipes off behind the washers as I probably would have destroyed them if I used my oxy torch to cut the welds off. I actually have a set of "Snuff or Not" thingies that I bought maybe 20 years ago?

They'd probably do the job, but as much as I like "loud" pipes, I don't like straight out pipes, a good "lightly baffled" performance pipe makes for a nice crisp note, whereas a straight out system just converts gas into noise. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)