Second Mini-Pit Supermoto project.

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Hey Guys,

After my accident last Monday, I've decided to downsize to a mini-pit the same as Rox's, and concentrate on some smaller tracks until Rox is at a pace fast enough to run along side the bigger bikes at international circuits like Whilton Mill.

The reason I'm not sticking with my mid-size (12" wheels) is because it's like trying to maneuver a bus around the smaller tracks like Caxton, and Stretton.

So the general run down is a Honda CRF50 frame, fitted with shortened SDG Upside down forks, a Monstermoto Gull-arm swinger, 10" scooter wheels, and topped off with a hybrid 125 engine.

Pete. has been a f*cking God-send, and machined down both of my 140 barrels so I can fit them onto the 125 bottom ends, to create a fecking awesome track engine!

YX125 bottom end, Start in gear, with a 6-plate race clutch, short ratio gearbox, topped off with a YX140 barrel, piston, and big valve head.

https://a6.sphotos.ak.fbcdn.net/hphotos-ak-snc6/285149_10150283666155606_506045605_7646940_7141025_n.jpg

The wheels I will be running are these Suzuki AP50 wheels, 10" wheels, wrapped in a set of Sava MC20 cut slicks.
They have been cut with a wet pattern, but work fecking well in the dry, and good for the winter riding as they warm up bloody quick.

https://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/251714_10150203299905606_506045605_6990826_460345_n.jpg

On the front end, I am going to make up a hub for the wheel, so I can run twin discs. I've bought a pair of single-pot slide calipers form a Kwak ZX750, which look to be identical to the single pot Pit Bike calipers, only they have a left and a right side. Smile

https://www.bitzforbikes.co.uk/photo/286930.jpg

I'll update when I receive my frame.
The one I'm going to be running is billet. Thumbs Up

Will be a similar size and geometry to Rox's one.

https://a2.sphotos.ak.fbcdn.net/hphotos-ak-snc7/302772_10150358112861075_606081074_10217689_1728373_n.jpg

https://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/260216_10150242176135606_506045605_7237261_8053858_n.jpg

https://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/264648_10150242071878844_709558843_7221449_6829974_n.jpg

Reason I need a smaller bike, is because trying to get around a track like Caxton on my midsize, means hanging off like so:

https://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/251584_2304895588260_1425360384_32624719_1540636_n.jpg

More pictures to follow.

Ben

pepperami · Super Spammer Joined: 17 Jan 2010 Karma :

Like

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Beelzebob · Spanner Monkey Joined: 08 Sep 2010 Karma :

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

steven_191 · Nearly there... Joined: 31 May 2009 Karma :

i want one

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Front wheel for my bike.

I need to give it to my Grandad to machine the hub of the wheel down so the disc's sit closer together, as they're fouling the fork legs at the moment.

Twin disc front end on a pit bike FTW! Cool

https://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/301045_10150310652775606_506045605_7874049_813412634_n.jpg

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Just picked up my tyres and a second set of USD forks, so I can use two right hand fork leg bottoms to give the additional caliper mount.

My next job is to shorten the fork legs by about 25mm.

I know this is possible by fitting a spacer somewhere within the forks, but I have no idea where.

Can anybody give me a rough idea as to how I shorten USD forks at all?

Cheers,

Ben

Chalky. · World Chat Champion Joined: 30 Jun 2010 Karma :

Cool as usual!

I want one.

What happened with your crash Benny boy?

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Dont remember a great deal.
It happened at Whilton Mill international circuit.
I was following Rox round, we'd done about 3 laps, and the next thing I remember was being in hospital.
There are a few snippets which I remember between the two times, but little worth talking about. Just peoples faces, and certain things that were said.

From what I've been told. A group of bikes who ride my usual pace, had caught up with me and Rox, as I was only riding at her pace.
The leader of the group rode straight into the back of my bike, knocking me clean off. I smashed my jaw on the ground and KO'd myself.
Then the bike behind him ran me straight over.
Rox got knocked off too, along with about 3 other bikes, but nobody was really that injured.

It's put me off a little, as well as pissed me off.
If I'd of been riding alone, Id of been as fast, if not faster than the bike which took me out.
I'm also glad I was following Rox, as it'd of probably been her who was knocked off and ran over if I'd not been there.

Caxton raceway is a smaller circuit, who actually put the effort in to ensure all bikes are safety checked, and riders are catogorised.

Ben

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Just goes to show, shit happens if they leave the kitchen bro Wink

Hope you are getting better anyway.

Looking forward to this build, my "pit" is coming along alright Laughing

Sourcing a 140/160 for decent money is a bit Neutral

but i'll find something Mr. Green

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

The engine:

Short block is a Jialing / YX125 unit.
Good choice when running in the mini-pits, as they have a start-in-gear clutch setup, an all up 4 speed box, and a nice short ratio box.

Mated with a YX140 barrel, piston and big-valve head, creates a very fast, and snappy engine.

Suspect it will run around 15bhp once it's up and running.
Still waiting on a Z40 high lift cam to arrive for it.
Will be running with a Two-Brothers racing exhaust system, and a Mikuni VM24 carb mated to a gas-flowed inlet and Velocity stack.

https://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/299544_10150313565795606_506045605_7895042_82483321_n.jpg

https://a4.sphotos.ak.fbcdn.net/hphotos-ak-snc7/s720x720/294323_10150313565760606_506045605_7895041_3931568_n.jpg

Gazdaman · I did a trackday!!! Joined: 12 Aug 2004 Karma :

Did you make that catch tank? Would you run a bash plate aswell? I've still not got around to properly race prepping my Stomp, but a nice catch tank would give me something to do with the welder!

Gaz

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Gaz, it was made by a mate of mine. He produced about 30 of them, but there are none available now.
It holds 1L of oil.

Ben

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Oh, and Nah, It doesnt run a bash plate as they are for MX pits.
The bike can be stood on a bike stand, on the drip tray, which is handy.

Ben

Chalky. · World Chat Champion Joined: 30 Jun 2010 Karma :

Bugger, sounds nasty. Glad you're ok.

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

My plastics and graphics.
Yammy colours, but CRF style to go with the plastics.

https://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/320804_10150317493510606_506045605_7914845_68826983_n.jpg

https://a8.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/314942_10150317493225606_506045605_7914839_378523121_n.jpg

New forks have arrived, along with a set of 10" tyres. Will get some pics up of the twin disc front end this weekend once I get the calipers from Yodel.

Ben

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Calipers fitted. I need to make a couple of triangular mounts up to brace the top mounting holes.
They are absolutely huge, but surprisingly sit close enough to the axle to get full pad coverage on 160mm discs.

https://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/320794_10150319893840606_506045605_7928292_1722783797_n.jpg

Shortened my fork stanchion travel:

https://a1.sphotos.ak.fbcdn.net/hphotos-ak-snc7/s720x720/303024_10150319894070606_506045605_7928295_118985529_n.jpg

Just put the Renthals on temp.
Got some proper BMX bars coming for it. Smile

https://a5.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/308694_10150319894615606_506045605_7928297_363113020_n.jpg

Just to give an idea of the caliper/pad size.
Left is a set of stock Pit bike pads.
When I saw the calipers on ebay, I was under the impression they ran the same pads as a pit bike caliper, hence the reason I bought them. Laughing

Didnt realize they were going to be 300% bigger!

https://a4.sphotos.ak.fbcdn.net/hphotos-ak-snc7/s720x720/302397_10150319894805606_506045605_7928299_1019757400_n.jpg

And the motor. All done.
Got a genuine CRF50 peg bar, which sweeps up nice and high either side, giving me extra ground clearance.
Also fitted the Z40 high lift cam.

https://a2.sphotos.ak.fbcdn.net/hphotos-ak-snc7/s720x720/300007_10150319895050606_506045605_7928300_1873912967_n.jpg

Ben

HD · World Chat Champion Joined: 16 Dec 2009 Karma :

What does that drip tray actually do?
____________________
Rusty '02 Vito Camper + CBR600F3

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Carb overflow pipes are plumbed into it.
As is the oil breather pipe.
In theory, it should catch anything should the cases give way, or the sump plug come out.

It's just a regulation for track. Same as race fairings on a sports bike. The belly panel is enclosed.

Ben

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

Let me get this straight; a regular pit bike has ONE pair of the smaller pads on the left;
https://a4.sphotos.ak.fbcdn.net/hphotos-ak-snc7/s720x720/302397_10150319894805606_506045605_7928299_1019757400_n.jpg
And you have TWO pairs of the ones on the right Shocked

On something that weights about as much as a half eaten packet of crisps, with a wheel base I could measure with a ruler!

And slicks!

I see..................

TARMAC!

In microscopic detail, in your future!

Magifying effect of getting that close, that fast, you MIGHT even witness sub-atomic particles of McAdam!

Are you SURE about this twin disc set up? Surely that is just MORe retardation power than you can possibly exploit? Would you not get more advantage from going with the single gripper and saving unspring weight?

On a bike that light; weight saving of extra caliper would be fairly significant, and taking it of the axle best place to take it from.

Add on Ed: you have me reminiscing. Used to spanner for couple of lads running old TZ's or eLCies; 350 twin disc was a 'must have'. BUT; noticed couple of lads in class running single disc set ups.

The twin discs were, very powerful, and hauling up hard for the hair-pin at Mallory, brilliant, tail wagging tyre sqirming; BUT!

Over-Braked, easy to over cook it on the brakes, and OK, advantage is there to get past people on the turn in; BUT, and I was probably not that diplomatic in the way I put it; you don't win races going a little bit less slow than your field mates, in slow corners; you win races by going a lot faster than them in FAST corners!

Always wanted to try the single disc set up & see if it made much difference to actual lap times; because from where I was stood; always seemed that it was extra weight for no great advantage; only at the faster tracks like Silverstone where you had straights long enough to get up a real head of steam with a corner tight enough to really need to scrub it off again at the end, did they have any real merit;

On a pit bike, running on tight twisty pocket track; I would have thought similar would apply; you wouldn't have the length of straight often enough to get the speed to need to scrub it off again.

How long are the races?

Is there risk that concentration drop off and race fatigue you'll loose feel and risk front end wash from such fierce brake?
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HD · World Chat Champion Joined: 16 Dec 2009 Karma :

That's what I thought but I thought I was just being stupid cos it looks gay Laughing

I get it...

And Mike, I kind of agree with you but, who gives a shit, its gonna look beast Wink

____________________
Rusty '02 Vito Camper + CBR600F3

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

It's probably going to be far too much.
BUT, I've done the ground work now. I was expecting the calipers to be A LOT smaller. Laughing

Gonna see how it goes with the twin setup, will probably be FAR too much, but may as give it a go.

Weight wise, you do have a point.
Although I'm running ally wheels, fitted with tyres and innertubes.
It's not as light as it looks unfortunately.

It'll still go bloody quick, and hopefully stop very quick too.

On another note, It wont have any rear brake.
So the weight I am adding at the front, will be saved at the rear anyway.

Ben

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

waffles · World Chat Champion Joined: 04 Oct 2009 Karma :

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :