Mito 443 Project

[Yazza54]

Got some R-5 needle jets in the post last night so threw them in, bike certainly seems crisper and I'm on the middle clip. Before I was on the top clip (weakest) with R-6 needle jets. Was too late to ride it or run it too long but I could notice a difference just from how it ran. Need to put some load on it and see whether the clip position needs adjusting.

Also did a bit of CAD (cardboard aided design) and made some attachments for the rad in an attempt to try and force air through more effectively.

[IMG]http://i133.photobucket.com/albums/q53/yazza54/108C2DB7-BD79-4FBE-8577-8137E3685D81_zpsr5djioy8.jpg ~original[/IMG]




Also sorted the gear linkage out and fitted a new rose joint. I normally buy the heavy duty ones from McGill motorsport but seemingly fitted a cheapo one when I built it, so the lesson is buy cheap buy twice. The McGill ones are not cheap at 9 quid a pop for an m6 rose joint, but the quality is great.

Edited by Yazza54 on Wednesday 13th September 20:53

Edited by Yazza54 on Wednesday 13th September 20:54

[Yazza54]

Low to mid 50s normally but it rises quite quickly to high 50s when giving it some. Hardly cooking itself but I don't think enough air is being channelled through at speed

[Yazza54]

The bike now has a powerdynamo kit fitted, wasn't too difficult to do, wiring was simple enough. Actually bolting up the flywheel without it bloody moving was probably the most difficult thing as the power dynamo kit has no woodruff key. Contrary to popular belief the woodruff on the standard flywheel isn't to hold it in place, it's simply to give it a known fixed position.

The beauty of the ignitech is that it can be strobed and adjusted anyway so as long as you set the base advance correctly then it's fixed reference point is known and it can work from there to give the desired curve figures that have been programmed. Get this wrong however, and the whole map is thrown out.

Certainly revs quicker and freer, haven't noticed any real lack of tractability as whilst it's considerably lighter than the standard flywheel there's still a reasonable weight to it.

I played with the air screws and found it's much happier when you hit the throttle now. I'm waiting for some smaller pilots to come as I believe they're still too rich. Will then ride it again and play with the needles/clip positions until I'm happy, but I felt very positive after riding it last night, much better..!

It genuinely feels like its a couple of adjustments away from being on the money now after all this time. In reality it'll probably be more than a couple but I have some proper direction now.

Edited by Yazza54 on Wednesday 5th April 11:59

[Yazza54]

Messing about with new camera last night. YouTube seems to reduce the quality somewhat. Have been playing more with the needles there's a very fine sweet spot I found, tried to lift it another clip went the wrong way so it felt a bit flat, but you get the idea.. couldn't really go flat out but it picked up the sound well

https://youtu.be/uKHrOuJjUXg

[Yazza54]

MotorsportTom said:

Yazza54 said:

Messing about with new camera last night. YouTube seems to reduce the quality somewhat. Have been playing more with the needles there's a very fine sweet spot I found, tried to lift it another clip went the wrong way so it felt a bit flat, but you get the idea.. couldn't really go flat out but it picked up the sound well

https://youtu.be/uKHrOuJjUXg

That sounds mint!

Don't fancy coming along to Oulton this weekend to watch BSB do you? I'll be up there and would love to see it in the flesh

Hi mate not planning on going but hope you get some decent weather. You going on bike or car? The place gets absolutely gridlocked on big race days

[Yazza54]

MotorsportTom said:

Yazza54 said:

MotorsportTom said:

Yazza54 said:

Messing about with new camera last night. YouTube seems to reduce the quality somewhat. Have been playing more with the needles there's a very fine sweet spot I found, tried to lift it another clip went the wrong way so it felt a bit flat, but you get the idea.. couldn't really go flat out but it picked up the sound well

https://youtu.be/uKHrOuJjUXg

That sounds mint!

Don't fancy coming along to Oulton this weekend to watch BSB do you? I'll be up there and would love to see it in the flesh

Hi mate not planning on going but hope you get some decent weather. You going on bike or car? The place gets absolutely gridlocked on big race days

I may be able to get you a pass to get you in... My girlfriend's dad is running in the Ducati Tri-options.

I was planning to take the car because my bike is tucked up waiting for someone to buy it. Might try and borrow a bike though if it's that bad.

Appreciate the offer mate but it's always a bit of an arse getting in and out and I've got a fair bit to do this weekend. Would have been more tempted if it was looking like a hot one but the forecast looks pretty crap at the moment

[Yazza54]

WinstonWolf said:

very nice, but I wanna hear the bugger screaming

I'll have to find a private road for that

[Yazza54]

Thought I should post an update, shame the rest of the thread is now fked due to the wkers at Photobucket.



Got the bike on Muttsnutts (Dave Whattam's) dyno over the weekend. Was really looking forward to getting it dialled in properly so went armed with all my bits. Day started off well, we were making gradual improvements and Mutts was very thorough, spending lots of time on low-mid part and full throttle running and gradual timing adjustments.

We seeming to be getting somewhere then we had major issues with my carbs. Half way through the day they became very inconsistent, we couldn't replicate a run on the dyno on the same jetting and tried absolutely everything, checked for leaks, checked fuel supply, cleaned the carbs out about 5 times.

This is similar to my experiences with the bike on the road, I can spend some time making adjustments and think I'm getting somewhere with it then it all goes backwards. Or I'll park the bike up thinking I've got somewhere and it'll run terrible the day after.

The only consistency I've had from the Mikuni TMX carbs is that they have been consistently inconsistent.

From the get go we had a bad flat line from about 4500-6000, but the initial response wasn't bad and it pulled hard on the pipe, just struggled to get on it. After the carbs started causing problems it had a terrible hesitation under load, similar to fuel starvation, and nothing we could do would remedy it and believe me we tried EVERYTHING.

At about 7.30pm and me ready to throw the towel in (or my toys out of the pram), Dave was still ready and willing to try something else, not wanting to admit defeat, and suggested we fit a set of 38mm PWK Airstrikers he had on the shelf he bought to try on his bike. We threw them on, unbalanced and unjetted, straight out of the box. Just as a way to eliminate whether it was in fact the carbs that fundamentally had some sort of issue.

He started the bike up and not only was there no hesitation under load, the bike took full throttle and pulled straight through the 5k-6.5k hole its always had! Obviously not perfect but way better the Mikunis ever were.

So there we have it, a few people have told me to get Keihin PWKs, but I guess seeing is believing. They are supposed to be a lot more forgiving than the TMX carbs with respect to altitude and ambient temps and give better low-mid performance.

If we hadn't tried them I would've been leaving completely disillusioned and pissed off, but as it happens I've never seen my bike perform that well and so I left actually quite excited and optimistic, needless to say I've got a set of 38mm PWK Air Strikers on order and am booked back in with Dave to get it dialled in.

Thanks to Dave for his patience and perseverance as I was ready to torch the bike at one point.

[Yazza54]

We didn't do any power runs as we were mainly trying to get rid of the mid range hole in performance, it didn't see more than 8k all day, but it was following the same curve as it did when it made 109hp last time as we had that loaded up on screen to overlay.

[Yazza54]

podman said:

Great stuff Ryan, Dave knows his stuff eh and always has something lying around to work his magic with!

You going to be using the bike from now then mate? 109BHP in that chassis must be a riot..

I've been using it a bit but always been playing with the carbs and never found a setting I was remotely happy with. Once these new carbs arrive I'll be hoping to get them set up and use it as much as possible.

[Yazza54]

Yeah, they can be a pain but generally the bike has been good and never broken down as such.

The carbs don't have a TPS, it's all been down to fuelling. I think the general consensus is that the Mikuni TMX can be gotten half decent but keeping it on that window or sweet spot is very difficult. They are a bh to tune too as the needle literature and options available are nowhere near as good as the Keihins. Oh well, at least I got the original ones for nothing and have a way forward!!

[Yazza54]

Have got it running quite nicely on the PWKs now, unfortunately we didn't have the right needles at Dave's and only pilots up to 58s, which you'd have thought would be big enough but she's bloody thirsty! Maybe it's a feature of the PWK air strikers, it's certainly gulping plenty of air in. Unfortunately it was one of those catch 22 scenarios where the 58s realistically were still too small but going that large was dogging the engine in other areas as we needed a leaner needle. So we ended up with smaller pilots and barely cracked open air screws, Dave as usual didn't want to give up which was great but I think we were never going to get anywhere with the bits we had on the day. What was very promising though was it did something like 160 runs on the dyno and they were all ultra consistent and we could track every change we made.

The most it did on the day was I think around 102 at one point, but most runs were nearer the 98-100 mark, which is still a lot of power at the wheel, but when I took the bike out a few days later I could notice the power loss - BUT, also noticed that there was much more potential in these carbs and it was very smooth.

Ive been playing with it after work just changing little things and heading out. I've now ended up with a much leaner needle, slightly fatter mains and considerably bigger pilots allowing me to actually get some use from the air screws which has made all the difference, it just picks up and goes now when cracking the throttle open, pulls through the flat spot much better before it comes on the pipe and feels bloody fast, so there's no doubt in my mind it's got to be back to somewhere nearer the 105-110hp region, it certainly feels way better than its ever been and I'm not even finished yet.

I've got a few more tweaks to make then when I'm happy with it I'm going to do a top end refresh, run that in and probably take it back to Dave's for any fine tuning/verify it's safe. Also waiting for a new ignitech quickshifter sensor as mines given up, the way it makes its power it's much nicer to ride with that working!

[Yazza54]

Yeah nah

[Yazza54]

It doesn't feel like it's been that long! It's about 2 years since it first ran, probably been on the road a year and a half or so. There's been periods where I've not done much with it too, it spent a long time at my parents house when I had garage problems etc. I can't see me getting bored of it. It was very frustrating pissing in the wind constantly with the old carbs but a great feeling to be finally getting somewhere.

Gutted that Photobucket has ruined the thread

[Yazza54]

Great service from Martin (mad biker designs) as usual. New 68mm wiseco pro lites, rings, little ends and pins. New base and reed gaskets too and going to try some Evans waterless coolant in it. Might do this at the weekend but more interested in fine tuning the jetting at the moment. Have gone what feels like too far now on 170 mains so going to spend some time gradually coming back down. I've bought the in between sizes, I.e. 162,168 - think it'll end up on 165s which it felt pretty good on. It felt lean on 160s and too rich on 170s but I'll try the in between ones anyway.

Edited by Yazza54 on Thursday 10th August 18:59

[Yazza54]

As far as I'm aware probably just helps reduce weight given that this is the meatiest part of the piston. Might help keeping it cool too. Seen loads of 2 stroke pistons with holes above the pin, some with quite large reliefs down the side of the piston too but other than reducing friction I'm not sure what the purpose is.

[Yazza54]

Have decided to sell up.

[Yazza54]

Ilovejapcrap said:

I'm using Imgur now pal plus you can upload from your phone

I’ve been using that too, don’t find it as good as photobucket but at least it’s free

[Yazza54]

SteelerSE said:

Wow! Has someone offered you loads of money for it or are you just wanting another project?

Neither, I’ve just decided I’d get more out of the money than owning the bike. The main kick I get out of it is the sense of achievement having built it and that won’t change if someone else owns it. I’ve only put it on RDLC Crazy so far as I don’t really want to advertise it to the masses on eBay etc. If I can help it.

[Yazza54]

It’s had a bit of traffic on the Facebook page. They must have nicked the info from the PB mag forum. Bike goes tomorrow evening and I’m quite pleased about who it’s going to.