Ok guys I got the large journal crank outta my 1275 block, Chong mentioned stroking it, which I gathered would be by an offset crank grind back to the smaller journal size. Am I right? What rods would be suitable for this? I heard some honda rod works.... No more info on that though. Im boring to the 1360 size what capacity will that give me?

I might as well get this done while im grinding the crank.

Nathan

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2002 TopKart Viper with Blueprinted Yamaha KT100S @ 17hp. 160kg.

You will need S rods if you stroke the crank. Many LJ cranks don't stroke too well though...and many break..especially if you get a bit rev happy..

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

and hit mat up for some 80 under bearings.
I have S rods for sale .

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A good friend will come and bail you out of jail...but a true friend will be sitting next to you saying "Damn...that was fun!"

If you offset grind (stroke) it from std 1.750" to std 1.625" dia pins, you should get ~84.3mm stroke out of it.
That will take it from 1360cc (with 73.0mm pistons) to 1412.
but crack test it first- many of these big J cranks seem to be cracked now.

re the -.080" bearings (lets you stroke further), they are dodo dung now.
Matt is trying to scare some up on the MM board. I wish him luck.....

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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.

yeah, don`t listen to Dodge, the .080 undersize bearings are for a very long stroke 1510cc engine i`ve had for years

you`re building a 1412cc & they`re a GREAT engine

If you havn`t started the stroking process yet then PM me as i can take you through what we do to them , it`s a little more costly (not buy much) but makes them a much stronger ccrank,,,provided they`re not allready cracked

"DIIIIIIIIIIIIIIIIIIIINNNNNNNNNNNNNGGGGGGGGGGGGGggggggggggggg" or "Clunk" test them first, then send off the best "DDDDDIIIIIINNNNNNNGGGGgggg" sounding one to the crack testers & then PM or e-mail or ring me after that & i`ll set you up with the method we use to stroke em

OH!!! & start with an "UN_WORN" std/std large journal for optimum stroke

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Oh & you`ll need to "Narrow" the "S" rods that you use for them to fit ,,,.015" (15 thou)per side of each rod

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

you don't need Cooper 'S' rods.
1275 Midget/Sprite rods (625) do the job without the hefty price tag.

same rod, except for the factory balancing, same part numbers etc ...just didn`t recieve the "Cooper S" balancing treatment, 6 of one or half a dozen of the other.

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I've never seen either type of rod for sale...maybe I don't look in the right places....

stu you need to ask the right people i only have 3 sets.

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www.minicranks.com add me to your watch list and come back again soon, under construction.

& it`s the 177 or 521 rods you will need,,,& i would use the 521 rods , they are way stronger than the early 177 rods

you can`t use large journal rods at all as the stroker cranks start off as large journal but are then machined offset down to the small journal size, so small journal rods are the only ones to use, Buy some 521`s

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Geez and I thought I was a hoarder *lol*

MG Midget AEG625 rods will work, if you find any.
Pretty much a 1275S rod with lower steel spec.

I'm a hoarder too, but sorry, got none...

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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.

Ok guys, just got back from the engine shop stripped the head and block and dropped it in the hot tank. Also ordered a rebuild kit with 73mm Hypatecs, Small J rod bearings, all stuff needed to machine it up and dummy build, currently needing some small journal rods, willing to swap for my large J ones + cash. Also does an 1100 cam fit in a 1275 block? (with regrind) I'll need more parts later will keep posted.

Nathan

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2002 TopKart Viper with Blueprinted Yamaha KT100S @ 17hp. 160kg.

Yes an 1100 cam will fit any 1275 block, if it's an 1100S block you may need to tap another hole for the S oil pump. Depends what pump brand.
Personally I'd run an S or 1100S cam blank, as they have 1/8" wider lobes..

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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.