The cheater MX85 argument. I might be changing my mind.

[husaberg]

Have to get lucky with widths to suit. And only $100US, a snip, might've well buy a few to try.

I think it is 100 euros...... I have feeling they were1/2 that price hen I seen them first.......

[F5 Dave]

Well along with forcing them on by deforming the cages and pushing I can't see any impediment to reliable action.

[husaberg]

Yeah when I originally found them they were 79euros.

I seem to have found a Eccentric pin which might work in the MB100/H100 motors that would allow the use of a Strike 52mm kart piston it alow the use of a STD style bearing as well the price looks ok.
I will post the pics and the links later.
Speedpro used this approach but the cost I guess was probably a lot more than an off the shelf mass produced solution.

http://www.lambretta-teile.de/Big-en...-62mm-Vespa-PX
http://www.lambretta-teile.de/Excent...espa-PK-PV-V50
http://www.lambretta-teile.de/Eccent...-54mm-Vespa-T5
http://www.vespa-lambretta-teile.com...nghub-625-mm_1
http://www.worb5.com/shop_de_7/start.php?P_2071.php

There are other option if you bore out the crank to 22 if there is enough room.
The Bearing according to the blurbs is ment to be able to wigggle on?

I am having trouble finding the widths the Vespa seem to be around 15mm not sure with the Lambrettas where scooterboy

[speedpro]

The pin I had made has 20mm ends and a 22mm centre. The offset is .75mm for a stroke decrease of 1.5mm. No wriggling of big end bearings required as the centre is larger than the ends and even at minimum is still .25mm above the surface of the 20mm section.

[husaberg]

Did ever find out why Daves Broke?

[speedpro]

He's really rough on gear is the likeliest correct answer.

[Yow Ling]

Did ever find out why Daves Broke?

Too many kids

[Grumph]

Too many kids

Explains why he posts at odd hours in the early AM too....

There was a pic promised of the pin but it's never eventuated.

[koba]

The pin I had made has 20mm ends and a 22mm centre. The offset is .75mm for a stroke decrease of 1.5mm. No wriggling of big end bearings required as the centre is larger than the ends and even at minimum is still .25mm above the surface of the 20mm section.

So one should be able to use all that area to offset 1mm and run a 2mm longer stroke?

(Thinking of my road project here, that would take me to 120cc...)

[F5 Dave]

Explains why he posts at odd hours in the early AM too....

There was a pic promised of the pin but it's never eventuated.

Oh yeah, wonder wher it got to. Life is so complex at the moment.

[FastFred]

Nice of you to offer, but 2mm clearance is probably getting a bit on the loose side. A nice brand new crank would likely be of more interest. There has been a little interest expressed in a run of offset big end pins. It's getting tempting to check out current costs for say a run of 5. Throw in a (legal)rod kit and a bit of crank machining and it could still end up being quite expensive but you save by using cheap KT100 pistons and being able to step up in .05mm steps extending the life of each cylinder.

Offset gudgeon are you meaning crankpins?

Did you check the scooter ones i posted a while back against the STD mb/H100

Actually the T5 eccentric pin looks like it could work with limited mods as its only 2mm short

The width at the big end is workable? with thinner thrust washers

Rod the right length but the little end is to big, so bugger.

http://www.sip-scootershop.com/en/pr...+pin_4043ad213

http://www.sip-scootershop.com/en/products/crankshaft+pin+drt+eccentric_4043ad179

Attachment 297794Attachment 297795

Have to get lucky with widths to suit. And only $100US, a snip, might've well buy a few to try.

No no don't go to any trouble, change the rules.

[chrisc]

Hahaha why the HELL am I dredging this thread!

Just as an FYI, here's a link to a guy's 85cc to NF4 build.
He mills down the mounting point on the sprocket side of the casing to get the correct chain alignment and makes a new mounting block for the rear.
The engine looks like it fits really nicely

http://miniroadracers.informe.com/fo...-t2671-40.html

[TZ350]

MX engines, limited to 85cc no other restrictions

Proposed Rule Changes........ it is getting to that time of year again. If anyone has anything lets get it out there.

[speights_bud]

Proposed Rule Changes........ it is getting to that time of year again. If anyone has anything lets get it out there.

Remember the proposed changes need to be submitted by a club which has voted to do so and has the correct documents to support the proposed changes.

Just a reminder as time goes fast. Put your proposal in at your next club meeting and have the paperwork ready for the committee to rubberstamp.

Sent from my SM-G900I using Tapatalk

[Henk]

Most people probably know where I stand on this issue but out of interest how many people would actually build one?