Kev's covered it. Let us know how you get on. Steve

well i have pulled it all apart today and have found that it look like the spring is way off, i know it does not move much but it is a fair bit off being flat,
kev where do i need the spacers for? i have three straps and when bolted up the straps are not flat either, i wmight just drop it off at GR's in the morn and let him do it all for me cause my lathe is too small and will not hold the flywheel and my drill press is onlt a toy too.

will see how i go.

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

You only need spacers if the flywheel has been lightened by turning. Usually 0.200" comes off so 3 spacers about that thick are put under the straps.
If flywheel is stock or lightened by milling, not needed. maybe add a washer if you need to. Straps must be parallel to flywheel when all assembled, and the spring FLAT.

I don't use a press- I just add/remove packing until I can see spring is flat, then allow for it in machining. Handy we have 3 lathes at work..
Mine is spot on now. It was out by .035" (thickness of 1 strap) so I machined that amount off the 3 posts on the backplate.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

ah i see what you mean, the flywheel is lightened but still has the posts on the flywheel as it was milled, I forgot to grab it this morn to drop off at GR's and i go away for work tomorrow so i guess i will wait till friday when i get home, but thats cool.

thanks for all the advise and i will let you know how i go.

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

well i droped the assembly of at Gr's this morn and he is setting it up for me so i should haopfull get it back tomorrow fingers xed.

its been to long since i drove my boostedmini

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

When a third strap is used, that amount must come off the back plate horns and the flywheel, where they bolt to the flywheel. On flywheels that have had material faced off, this is not a problem as suitable spacers are made up to fit the distance after the spring has been set up flat.
Your flywheel has been milled, so the height for the straps is likely to be stock, so if you are going to use 3 straps, this will be a problem. GR will know this, but something to check on when you pick it up.

PS, ask him has he finished my head yet!

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Steve

Steve,

when i spoke t GR this afternoon he said it all looked ok, but he never mentioned taking off the material where the back plate posts are or off the flywheel, i am going to try and get there tomorrow.

I was in Cairns just last week for work and up there every 8 weeks or so, if you ever need anything from Karcraft or GR just let me know as they are 5 mins from work

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

When you see him ask him about it. Thanks for the offer on bits, I'll keep it in mind, Kev kindly sent some bits from Karcraft last time. Have time for a beer when in Cairns? Happy to catch up.

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Steve

well all sorted now, GR had to take 110 though of the three back plate posts. thats like almost 3mm much more than the thickness of the one strap i added.

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

No wonder it was slippin'. Let us know how it goes when it's back together.

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Steve

Good to hear you found something was wrong in there and fixed it.
Should lay rubber, now!

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Well it's been interesting reading this thread as Morris is on the floor still and Bolts are all the way out..I have a Cunning Plan

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Stop Licking the Dog...I Don't Care Who Started It

can someone post some pics.. i have no idea what your talking about.. is the mini clutch really that weird? ive changes a few clutches.. but what are these straps your talking about?

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Expert in training

i have t take some pics of a few other things whne i return from WA on Thurs night so i will taek some of the clutch assembly together and striped.

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

Kev, just looked at a friends flywheel and straps without the spring/diaphragm thingy attached.....two straps had a slight bow (up about a mil) in them....one near straight.....and there was about a 1/10 inch to come off the posts for the straps to sit flat (or 1/10 washers under the bolts to make the straps parallel....(parrallel, but about 1/10 above the face of the flywheel).

Centralising the whole thing is within about 60 thou

The question is....do the straps have to be flat to prevent clutch slip?? as the symptoms here are clutch shudder...

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"Show me the Mini!"