CB-1RR

[Iain.]

New little project.

My CB-1 broke down...

https://i.imgur.com/txFrG3Ql.jpg

Upon stripdown, seemed I'd done quite a good job on the engine. Extensive damage to the head, barrels, crank, pistons, and a lot of metal circulated.

https://i.imgur.com/LtxuTzVl.jpg

https://i.imgur.com/yX2HK5ll.jpg

https://i.imgur.com/Azz1HhGl.jpg

https://i.imgur.com/0opinDgl.jpg

Talking to a few freinds, one happened to have a CBR400RR trackbike that'd been up the road. We figured as the cams are sometimes used to power up a CB-1 the engines just might be interchangeable. So, we dug it out of the hedge it'd been in for the last six years...

https://i.imgur.com/SQe8CYQl.jpg

Dragged it back to the garage;

https://i.imgur.com/fRd8A0al.jpg

And gutted it;

https://i.imgur.com/47przYLl.jpg

https://i.imgur.com/bSGJQK2l.jpg

Old engine was pulled out of the CB-1

https://i.imgur.com/vzMyo1cl.jpg

CBR by this point wasn't looking so great. It really was ruined.

https://i.imgur.com/D0fenXTll.jpg

We then offered the engine up to the CB-1 and found two of four mounts fitted perfectly!

https://i.imgur.com/evLulqOl.jpg

Then I realised the CDI plugs were different, as were the carb spacings and half the loom plugs. Stripped the CBR of its loom.

CB-1 loom does the lights and charging & idiot lights. CBR loom does the spark & rev counter. Had to bypass the neutral switch to make it fire.

https://i.imgur.com/yemyylul.jpg

https://i.imgur.com/SDm4Tz4l.jpg

https://i.imgur.com/CeaQGaSl.jpg

Fabrication of the front mount started whilst I got on with removing the various things living in the carburettors from the CBR.

https://i.imgur.com/mwM748vl.jpg

Popped the carbs on, added a little fuel and it fired right up!

https://i.imgur.com/Asvm9OLl.jpg

Hoping to have this rideable by the weekend.

[RhynoCZ]

It's cool to see you've decided to do it.

Are you gonna use the CBR front end? I know I'd try to.
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[P.]

no airbox, just trumpets plz.

[instigator.]

I love these wee CB-1's. At what mileage did your engine go? They're known for being quite reliable, no? I want another one now.

[Iain.]

At a later date i'll refurb the front end and I intend to try and fit the swingarm as it's a rather nice braced item. Forks look to be the same diameter so I think I can make them work, means double discs. Make for a decent chassis upgrade package anyway, but need to make it work first.

In answer to mileage? It had 10k in 2006,7,8,9,10 where it jumped to 64k and hasnt changed till present but has been MOT'd each year. Could be anything

We've tracked down some aftermarket headers...Hansei? They've been tweaked to fit.

https://i.imgur.com/IqgzVEV.jpg

The carbs barely clear the tank even after attacking it with a hammer so I have the trumpets & an open sponge filter on top of those. See how it fuels on road test and go from there.

https://i.imgur.com/ljH1sj9.jpg

Tank fits though

https://i.imgur.com/0xuuGZW.jpg

Feeling fairly positive at the moment, need to finish the frame and get the radiator brackets made before I can actually run it up and try to get the thing adjusted & idling nicely.

[P.]

Dat air filter

[SQL]

best air filter ever

[RhynoCZ]

[Billing]

If the forks are different lengths just swap the lowers, I have NC30 lowers on NC23 uppers and guts, meant I could bin the 2 pot sliding calipers and use the 4 pots from my old '30
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[Fladdem]

Nice screen Iain!

I like that idea a lot, I would have thought it would have fallen straight in as well, but doesn't look like it takes too much effort.

My super four has 82K on the clock and feels as sweet as a sweet thing, but has been well looked after, maybe yours hasn't...

I feel like mine could do with about 10 more horses and stiffer suspension up front, brakes are ace, and everything else is ace!
____________________
Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.

[qarka]

CB400 superfour and CB-1 are quite different beasts no?
____________________
Previous - Sinnis Apache - Honda Bros 400 - Yamaha SR500 - Honda Transalp - Kawasaki ZX-7R - Honda CB-1 - Honda 929 Fireblade - Honda NTV650 [b]Current[\b] Honda CB500

[qarka]

Wicked project btw!
____________________
Previous - Sinnis Apache - Honda Bros 400 - Yamaha SR500 - Honda Transalp - Kawasaki ZX-7R - Honda CB-1 - Honda 929 Fireblade - Honda NTV650 [b]Current[\b] Honda CB500

[Fladdem]

[Iain.]

Things happened

https://i.imgur.com/3dGJSG1l.jpg

Lots of nope living in this engine. Found this bastard hiding in it.

https://i.imgur.com/fncpiIBl.jpg

Big issues with the engine mount, simply no way of making it fit. Chopped it up;

https://i.imgur.com/DX1pag0l.jpg

Then attempted to weld a box section mount around the headers which just wasn't happening.

https://i.imgur.com/cCCqXo3l.jpg

Then gave up, and attached it to the cylinder head mount instead. Ought to hold it...soon find out if the engine falls out I guess, keep an eye on it and see if the welds start cracking.

Found an exhaust in a hedge that seemed to fit, so got that hooked up at the moment. Was near where we found the CBR so probbably came off it at some point.

https://i.imgur.com/Sv8sTFkl.jpg

Did ride it, rode like an absolute dog. 1/8th throttle and 6,000rpm is about the limit. Being hamfisted you can rev it out but it's very spluttery and pretty much pointless trying to do so...bike back in bits again.

https://i.imgur.com/RXVll3Kl.jpg

https://i.imgur.com/jM1T3A1l.jpg

Carbs off and in a bazillion bits.

https://i.imgur.com/aMgfvhzl.jpg

https://i.imgur.com/qBPCQO2l.jpg

Picked up a fiberglass matting kit, I'm going to attempt to make the bottom half of the airbox, I can then bolt the trumpet panel off the CBR carbs to the CB-1 air filter element and top half of the airbox at an angle that it'll fit under the tank. See where that goes...if its a non starter then I guess I'll just have to re-jet and shim needles till it's rideable but I suspect I'll loose a lot of power going that way. I can't make any more space under the tank as I've already had to batter the hell out of it just to clear the carbs and trumpets, it's a really tight squeeze under there.

The radiator needs a better mount too, but the motor makes oil pressure, selects all the gears, clutch is good, no coolant leaks, temprature reads all okay. I'm happy with that to be fair, fuelling issues were always going to be an issue from the second the CB-1 carbs diddn't fit the CBR head.

[N cee thirty]

should have just reframed the nc23
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Iain.]

[N cee thirty]

[Iain.]

[Fladdem]

Iain!

Here's one for you, would the NC23 header pipes fit a CB-1? And if so, would they fit a Super four? Or no chance at all?

I ask because I want more noise, but don't want to butcher my lovely stainless pipe.
____________________
Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.

[Iain.]

Nope. Port spacings totally different - hence cant fit the factory cradle into the bike.

CB-1 downpipes however might? Take some measurements - I've still got CB-1 downpipes with no can on them that'd be ideal for butchering!

[Matt B]

The most important question is - will this be ready for 1/4 mile shenanigans at Santa Pod tomorrow?
____________________
stinkwheel: He had an animated .gif of a cat performing fellatio. It's not socially acceptable. It can have real life adverse effects on other people.

[Fladdem]

[Iain.]

Will measure up when I clean the garage out.

Attempting to make carburettors work with no air filters isn't a lot of fun. I needed to do a lot of research into the donor bike to give me somewhere to start from before wasting money. Based on some ancient HRC setups, old manuals showing no airbox and some forum posts from 2007 I concluded the following;

Factory pilots are useable but read a smidge lean when dyno'd with no airbox. Increased from 40 to 42.

Mains are tiny. HRC kit included 140, 145 and 150 Keihin mains, dyno data from one with a modified airbox indicated 128 DJ mains were about on the money, if a little lean - they equate to about 138 Kehin. Opted to change the 110's to 145's.

The dyno pulls indicated the OEM needles shimmed offered the most stable fuel curve, and the HRC carb kits came with different needles. Speaking to Slipstream, my old boss and having been suggested the same by someone in workshop on here conclusion was needles need to go up to prevent the 6k drop off. Have put two more shims under each needle to richen up the midrange as a starting point.

Most of the parts are here, I'm taking the carbs to be ultrasonicly cleaned tomorrow. Might as well do the job propperly and it rules dirt out as a factor with setup issues. When it's back together and running roughly right I'll take it to the dyno and get it run up with a sniffer up the tailpipe to see what's actually going on & how much power it's making. Should be interesting!

[Vincent]

[Iain.]

Managed to borrow this for a few hours;

https://i.imgur.com/wZnMH7Fl.jpg

Removed all parts of the carbs I could get off and dunked them in. 80 degree bath, four 20min cycles. Cleaning solution was clear when I started! Shows how much these things actually get out of the carbs.

https://i.imgur.com/EGwxbbul.jpg

Flipped them over each cycle;

https://i.imgur.com/oGOvEH2l.jpg

Washed out with water, then dried with an air line & finished off off by cleaning anything else with brake cleaner.

Then started re-assembly;

https://i.imgur.com/0mJ4wSEl.jpg

Just awaiting the arrival of new pilot jets.