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PostPosted: Wed Sep 13, 2023 8:21 pm 
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998cc
998cc
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Joined: Thu Aug 03, 2006 11:47 am
Posts: 1197
Location: In Transit, Sydney
I have a stock standard 850 and am looking towards changing out to a newer 998 or 1100. Is there any worthwhile mods that can be done without major engine work to gain some extra horses on a standard 850?

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PostPosted: Sun Nov 05, 2023 11:22 am 
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1275cc
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Joined: Mon Mar 22, 2004 7:41 pm
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Location: Plumpton, NSW
Find a big hill and go down instead of up?

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PostPosted: Sun Nov 05, 2023 4:13 pm 
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998cc
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Joined: Fri May 03, 2019 7:17 am
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Most mods which are applicable to bigger engines will work on an 850 to some degree.
David Vizard's books have good ideas.

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PostPosted: Tue Nov 07, 2023 9:25 am 
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ET 13.457 seconds , OH YEAH !!!!
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Joined: Sun Sep 19, 2004 8:35 am
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Location: Somewhere Around Sydney
Maybe you can get the kids to push? :lol:

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PostPosted: Tue Nov 07, 2023 10:45 am 
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848cc
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Joined: Mon Sep 23, 2013 8:54 pm
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Location: Adelaide
I have an 850 with a 202 head, but never got to test it out much because the primary leaked oil into the clutch and killed it. I've since moved on to 1098s.

I wouldn't bother, make sure it is all perfectly tuned as stock and enjoy the period experience.


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PostPosted: Thu Dec 14, 2023 9:19 pm 
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998cc
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Joined: Tue May 13, 2008 12:40 pm
Posts: 864
Location: Queensland
Fit a 998 cc crank


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PostPosted: Sat Dec 16, 2023 8:28 am 
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religious status
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39621
Location: near Baulkham Hills, NSW
i got a mini wrote:
Fit a 998 cc crank

Won't fit without machining either the block, or the crank webs. Main bearings are wider on an 850.
Back in the 60s I fitted several 1098 cranks and pistons into 850 blocks. Slight mods to the conrods.

Put a 998 or 1098 motor (more torque) into it. :mrgreen:

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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. :mrgreen:


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