Mito 443 Project

[Yazza54]

Oh wow, that bad? I'll have a gander.

That Athena big bore kit inc stroked crank etc isn't really that much more expensive than a new ktm300 top end in real money

[Yazza54]

I saw a post from 2010 by wickedatv who were selling the same full kit for 1100 USD which really isn't bad at all. Any links to any others? Wonder what they're going for now

[Yazza54]

Uh ohhh

[Yazza54]

Yup!

Now do I use the mito forks and wheels etc and get it making progress as I've already bought them or make things really complicated and use different forks and wheels.

I've already bought the mito parts so nothing to lose I guess.

[Yazza54]

Lincsblokey said:

Yazza54 said:

Yup!

Now do I use the mito forks and wheels etc and get it making progress as I've already bought them or make things really complicated and use different forks and wheels.

I've already bought the mito parts so nothing to lose I guess.

I can't remember, but does the mito have mountings for double discs at the front? If not that may be the only reason to change front forks, you'll definitely need to scrap the rear shock anyway, if the forks are good for double discs all you need do is re spring/oil and your away.

Nope. Single disc albeit a big one with a brembo goldline caliper... My thoughts too mate but then again it'll be quite lightweight and won't be all about top speed

[Yazza54]

srob said:

Yazza54 said:

Nope. Single disc albeit a big one with a brembo goldline caliper... My thoughts too mate but then again it'll be quite lightweight and won't be all about top speed

I wouldn't worry about being a single disc if you can get a decent caliper/disc setup. Many Supermono racers were using single discs until very recently, and no classic Manx Nortons etc use twin discs, and they're putting out as much power as you'll be looking at and probably weigh more and being used far harder.

Just as an aside, wasn't the whole point of this project to use up an engine you had? Top man-points for diverting and getting carried away

Yep my thought too re the brakes but will need to stiffen the forks up but should be do able. They only have a spring in one fork and do the damping in the other so probably a trial and error thing with different oils, shim or change the spring etc.

It was! But to go 300 on the ktm it'd cost not that much less than a 421cc setup on a banshee/rd motor, and at the end of the day it's always just going to be a big mx engine - not ideal. Another big thing is the mito-ypvs engine mounts are available to buy, on a custom build getting the engine mounted is a massive milestone and I want to hit that ASAP so then it's starts to look like a bike in kit form rather than a load of bits that don't fit together if you know what I mean?

Edited by Yazza54 on Monday 20th January 08:42

[Yazza54]

srob said:

Yeah it sounds sensible, and very few projects finish as they started!

Forks wise, are they the same diameter as the RS250? They had a one spring setup I seem to remember, and may be weighted for the heavier bike?

Quite similar as far as I'm aware, I think they're 53mm will have to check. RS250 parts seem to either be unobtainable or a rip off. Might be worth seeing if I could retrofit the RS spring in my fork though if that's what you were thinking?

[Yazza54]

bass gt3 said:

Yazza54 said:

srob said:

Yeah it sounds sensible, and very few projects finish as they started!

Forks wise, are they the same diameter as the RS250? They had a one spring setup I seem to remember, and may be weighted for the heavier bike?

Quite similar as far as I'm aware, I think they're 53mm will have to check. RS250 parts seem to either be unobtainable or a rip off. Might be worth seeing if I could retrofit the RS spring in my fork though if that's what you were thinking?

Little nugget of info.

Mk2 Aprilia forks are the same as those fitted to the Honda SP1 etc. So whilst RS prices are a rip off, if you can find out what else used them, parts can be sourced from other bikes very easily. So if you can find a decent 53mm set up, maybe use that complete

Very good point, I also wondered if the mille showa forks are similar to the RS250 forks. As far as I know the mille forks will fit the mito yokes with very little work, but it's all the re engineering that comes after that, so wouldn't mind messing a bit with what I have for now.

[Yazza54]

Erm so yeah, funny reading my last few comments on here..

[Yazza54]

Rsv mille mate, got an rs250 rear wheel on the way too to match it.

[Yazza54]

Didn't know that existed, can you just add in what bike the frames from and what the front ends off or would you have to measure it all?

From what I can find on t'internet their rake and trail is vey similar. Obviously the forks might need soft springs and lighter oil but at least I'll have a proper adjustable setup with twin calipers then. Probably overkill but will look nice anyway

Edited by Yazza54 on Sunday 26th January 16:20

[Yazza54]

Biker's Nemesis said:

Yazza54 said:

Erm so yeah, funny reading my last few comments on here..

See that tyre on the radiator?..................

Let's not do this again

[Yazza54]

More bits

[Yazza54]

Graph of a set up similar to what I'm planning to use, this guy has a tz with a 421cc stroker with banshee big bore cylinders.

[Yazza54]

Yep it does fit, it's not that big the tyres a 160. Think the wheel is 4.5 inch, only prob is it needs some work to get central but it's do able, there's another mito knocking about with one fitted.

I'm probably not going to buy anymore bits now unless a bargain comes up, need to focus on making this collection of parts I already have fit together!!

[Yazza54]

srob said:

Dry build coming up?!

Going to focus on getting it rolling as soon as possible. Hoping to get the rear wheel/spacers modded and the front end fitted up then next month or so get a shocker and the mount kit bought. Gonna take longer and cost more than putting the mito stuff on it but that's not what I want at the end of the day.

[Yazza54]

[Yazza54]

Little update..

The real engineering is starting now..At the moment I've got the sprocket carrier for the Rs250 wheel at the engineers for some machining, this will basically bring the offset for the RS250 wheel right for the mito swing arm to bring it central so I can spacer the other side. Theres one other guy who's fitted this wheel to a mito and he machined all the cush drive out deeper in the wheel, cut his rubbers in half and all sorts, didn't want to do that and had a eureka moment last night there's more to it than a little machining but I'm not giving everything away

The frame is going to another engineer on Monday with some larger equipment to bore the headstock out slightly to take RSV mille taper roller bearings, lots of meat in it, and it's only slightly larger so no worries there. The only bugger with it then is that the Mille steering stem is too long, so I'll either have to shorten what I have, or press it out and have a new one made. Both do-able.

Before anyone says why not use the mito stem, yokes etc. I've thought about it and don't want to. Once the stem and bearings are sorted I just want to bolt the whole mille front end on, no fking about with wheel and caliper spacers etc. Infact I think with the mito yokes it'd be too tight anyway.

Obviously shortening it by cutting, pressing a centre piece in the welding it all up will be cheaper and I can just crack on with it, it's been dne quite a lot from what I've researched too. But it might always be in the back of my mind that I should've just got a new one made...

Anyway, not many updates but still lots going on

Edited by Yazza54 on Friday 7th February 10:20

[Yazza54]

Hi Steve

The Mille rake and trail is quite similar, 24.5 degrees mille to mito 25 degrees & trail 98mm to mille 97mm. The milles apparently went to a 25 degree rake as one of the revisions too, around 2003 I think, which is what my bits are from.

So pretty close... total fluke like

[Yazza54]

bass gt3 said:

Yazza54 said:

Hi Steve

The Mille rake and trail is quite similar, 24.5 degrees mille to mito 25 degrees & trail 98mm to mille 97mm. The milles apparently went to a 25 degree rake as one of the revisions too, around 2003 I think, which is what my bits are from.

So pretty close... total fluke like

Hahaha, fluke or not, it's good to know the numbers work.
If you measure the offset on the Mille top triple and compare it to the Mito's you'll know exactly what you're getting. If the rake on the Mito is fixed at 25 deg(headstock section) then the only variable is the triple. If it's the same, you'll be spot on for the Mito's original front geo settings.
One other thing to remember, the springs in the RSV forks will be much to strong fo rthe Mito, even witht he YPVS motor. If you can find out the Mito's fork spring numbers, and those for the RSV, i'd recommend going a point over the Mito's numbers to compensate. If you use the RSV springs, the bke won't ride nicely no matter what you do.
If you can't get the right springs for the RSV forks, maybe look at using a front from a light bike, RS 250 class.
I was going to use some Ducati Showa forks on my RS but the fact springs were not available in the lighter weights put that plan in the bin.


Good Luck

Yeah I know the forks will be too stiff, but softer springs are available thankfully. I'm committed now and I'll tackle that when I get to it, I'll even get bloody springs made if I have to.

Need a shock too soon... Can't wait to see the thing on it's wheels.