ESE's works engine tuner

[speedpro]

Now you've made me curious....

You should pop over for a beer. We could have another "sad bastards" weekend especially for you. Flettner knows what I'm talking about. The boys all get together and compare stuff they've made/invented over beers and pizza.

[Frits Overmars]

You should pop over for a beer. We could have another "sad bastards" weekend especially for you. Flettner knows what I'm talking about. The boys all get together and compare stuff they've made/invented over beers and pizza.

If it weren't such a long swim....

[F5 Dave]

Skype? .
.

[husaberg]

3 things about Honda 2 strokes i never realised.

They built a disk valve 125 tandem twin for a MX bike (seen the parallel twin MX never the Tandem)
can't find a pic sorry........
Big bang engine..... the NSR500 was not their first the MVX250 was actually a big bang (in more ways than one)

the center gudgeon was heavier for balance. It was even bushed smaller and had a solid gudgeon on the later models.(After a spate of seizures)

The Honda EXP-2 ARC gubbins made it into production as the CRM250AR.

http://dwolsten.tripod.com/articles/jan97.html
http://www.motorcycle.com/manufactur...xp2-15170.html

[Drew]

3 things about Honda 2 strokes i never realised.

They built a disk valve 125 tandem twin for a MX bike (seen the parallel twin MX never the Tandem)
can't find a pic sorry........
Big bang engine..... the NSR500 was not their first the MVX250 was actually a big bang (in more ways than one) the center gudgeon was heavier for balance it was solid on the later models.
He Honda EXP-2 ARC gubbins made it into production as the CRM250AR

I knew the MVX was big bang. Front two slugs fire together.

I think the NS400 runs the same, but for some reason it worked and the 250 didn't.

[husaberg]

I knew the MVX was big bang. Front two slugs fire together.

I think the NS400 runs the same, but for some reason it worked and the 250 didn't.

From what i read the solid yet similar size rear Gudgeon solved the MVX seizures. i guess they got it right by the time the NS400 came out
but the damage to the Rep of the MVX was already done.The gearbox is meant to be the same as a VT250. but the rest of it smacks of cost cutting.

[Rick 52]

Man, looking forward to this develop progressing. Keep it up TeeZee.
I've always been keen on a fuel injected bucket, so this and mikes project is very mouth watering.


North Island Series.
How about a side comp, battle of the teams (constructors championship)? ESE vs GPR vs Team Green vs team welly etc
Top two/three bikes home (points) from each team cumulated over the events.

I'll put a bottle of whiskey up (not Griff bootleg either)..

Very interesting !! I'm in but not sure about my team mates other commitments, now I'm not keen on Wiskey, could we ride for good Port ?

[seymour14]

Very interesting !! I'm in but not sure about my team mates other commitments, now I'm not keen on Wiskey, could we ride for good Port ?

Why not, a bit of gentlemanly rivalry never hurt anyone.....and Port is the poison of gentlemen.

[Drew]

From what i read the solid yet similar size rear Gudgeon solved the MVX seizures. i guess they got it right by the time the NS400 came out
but the damage to the Rep of the MVX was already done.The gearbox is meant to be the same as a VT250. but the rest of it smacks of cost cutting.

To my knowledge, there were no changes to the MVX motor the whole time it was in production. I've seen inside more of them than any person should, and they all run a larger rear gudgeon. I don't know how that would contribute to the rear slug seizing, please explain since I bought Whitetrash a running one. But lets face it, that's got a very finite number of starts before it's not a runner any more.

[TZ350]

I'm in but not sure about my team mates other commitments,

I am not sure we have enough running F4's to make it a Team race, most of our (mostly Chambers) effort at the moment is going into getting some F5 50's onto the track.

[husaberg]

To my knowledge, there were no changes to the MVX motor the whole time it was in production. I've seen inside more of them than any person should, and they all run a larger rear gudgeon. I don't know how that would contribute to the rear slug seizing, please explain since I bought Whitetrash a running one. But lets face it, that's got a very finite number of starts before it's not a runner any more.

This is the way it relayed to me.

The original was a very large gudgeon pin (say about 18mm) older and revised rear rods are all the same.
but were sleeved for the later smaller say 14mm solid pin.
The reasoning given to me was the heat transfer was not even.
Very few countries got the MVX. NZ might have only got the early model.


Honda even went as far as listing at the last update teflon coated (Rear only) piston in 14mm pin the fronts are all 12mm rears as i have said are 18mm or 14mm for the later models.
lots of MVX stuff discussed here even a Kiwi.

http://diffrentstrokers.com/phpBB2/viewtopic.php?t=934
there were loads of pistons made for the MVX. The fiche only lists three grades of STD, but they did make >025, 0.5 & 0.75 oversize. The rears came in two pin sizes 14mm & 18mm and the last revisions 506 are teflon coated
The best advice I can give you is to to contact MVX and NSR nut, Alistair. His email address is elmarie@dsl.pipex.com Have a look at this page on his website for yet more MVXs >> http://www.elmarie.dsl.pipex.com/MVX.htm

You could try Yahoo Japan for a crank as MVX stuff comes up on there quite regularly; http://search.auctions.yahoo.co.jp/j...ale=0jp&acc=jp
After searching the globe for crankseals, I did find the original manufacturer based in the USA who was prepared to make a limited run of crankseals. the dimensions quoted were 52 mm x 36mm x 6mm Nitrile 80. The catch was they would only make a minimum of 90 pieces with a lead time of 19-20 weeks at a cost of $2.12 American dollars each. Eventually I sourced some equivalent seals in New Zealand which are very close in size which appear to be doing the job. Three donor engines have been used to source enough parts to build a good crank and find suitable combinations of barrels
There is a routing of the coolant difference as well i understand.between models

You can do all of that now - here is the electric water pump on the Pre 82 Junior - Frepin400.

Have you seen these Wob?

NEW GENERATION RACING ELECTRIC PUMP
RACING ELECTRIC PUMP REP-01
Description: 9-15v, 20mm tube, 800-1000lt/h flow, consumption 0,95Ah, Weight 265gr
85€
RACING ELECTRIC PUMP REP-02
Description: 9-15v, 20mm tube, 800-1000lt/h flow, consumption 1,05Ah, Weight 350gr
55€

Bellow attached is the Official story of the MVX revisions from Honda

[Drew]

This is the way it relayed to me.
The original was a very large gudgeon pin (say about 18mm) older and revised rear rods are all the same.
but were sleeved for the later smaller say 14mm solid pin.
The reasoning given to me was the heat transfer was not even.
Very few countries got the MVX. NZ might have only got the early model.

That's at odds with what we found when researching how to make them reliable. No one seems to have achieved it with regularity.

There's not even a clear reason as to why they seize up the rear pot. People think they get too hot, but battering the cooling doesn't help.

[TZ350]

We could have another "sad bastards" weekend, Flettner knows what I'm talking about.

While Flettner was there Kel dropped by to talk with Chambers and Speedpro turned up and gave me a few tips on the EFI.

So we had a sortof sad bastards hour or so, where Flettner showed us his new cylinder idea, and now I have thrown my hat in the ring for a 100cc H2O version. But not sure if its going to be coupled to a CVT or traditional gears yet.



I hadn't immediately registered it the other night but the EFI TPS (top right corner) on the ProCal monitor screen has stoped working, it is stuck on 18% and not registering changes in throttle position.

The Ignitec is still registering the TPS OK so the conclusion is that its an Ecotrons software problem and Speedpro said he had seen this issue talked about on the Kawasaki 250 Ninja forum.

http://www.ninjette.org/forums/showt...otrons&page=42

And the answer on the forum was to un-install the Ecotrons ProCal program and reload it. It makes sense that the EFI firmware is probably OK and its only the monitor part of the calibration software on the laptop that has become corrupted.

I guess there will be a series of small issues like this to work through before the Beast is up and barking again.

[Grumph]

To my knowledge, there were no changes to the MVX motor the whole time it was in production. I've seen inside more of them than any person should, and they all run a larger rear gudgeon. I don't know how that would contribute to the rear slug seizing, please explain since I bought Whitetrash a running one. But lets face it, that's got a very finite number of starts before it's not a runner any more.

If the other cylinders aren't prone to seizure but the one with the heavy gudgeon is...that's the cause. I'd pick that the extra weight causes more side load on the piston which makes it hard for the oil film to say the least.

It would be interesting - and not hard - to build one up with 3 identical rods and rebalance the crank. Plenty of webs to take weight off to achieve the desired 100% of one side of the Vee balance factor.

[2T Institute]

3 things about Honda 2 strokes i never realised.

They built a disk valve 125 tandem twin for a MX bike (seen the parallel twin MX never the Tandem)
can't find a pic sorry........
Big bang engine..... the NSR500 was not their first the MVX250 was actually a big bang (in more ways than one)

Often thought about getting a MVX engine and bolting on 3 CR 85 cylinders, with an ignition and pipes would make a awesome roadie in a decent frame. The cycle parts were complete shit, as a L plater the choice was clear, shitter MVX, the KR 250 with those weird spinning discs, a cheap and cheerful RZ or the race replica RG. We all wanted the RG but could only afford the RZ, the KR was probably the best bike.

Gilera made a tandem twin 125 mxer, I know of only 1 disc valve honda that was a 125 mxer raced in the All Japan mx championship only (it's not at the Collection Hall), Honda did make a RC125M twin mxer (with RIBI front end) but that was a reed valve. That bike is featured in VMX mag No26.









The RSA-before-there-was-a-RSA CZ125 circa late 80's