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  #51  
Old 10-16-2018, 12:05 AM
Gibnut Gibnut is offline
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Quote:
Originally Posted by Jakobi View Post
Bugger me..

Combustion chamber cc's at 21.5cc
250cc piston dome has always been around 6.6cc
Volume of 1mm squish clearance is 3.46cc

Total trapped Volume 21.5 - 6.6 + 3.46 = 18.36
Compression Ratio (18.36 + 249)/18.36 = 14.56

Bit high I think..

If.. it was cut to 1.25mm as requested the ratio would down to 13.93:1 ...which is where my old 2010 was set. Last bike was 13.2:1

So so so.. Where to from here.
Mine went down to TSP twice as well.

Also, after you rip the 5mm thick gasket, check the retainer nut on the PV actuator rod thingy - mine had backed out all the way down the thread.


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  #52  
Old 10-16-2018, 03:23 AM
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My 300 is running just under 1mm so that is fine, can take out of chamber to reduce ratio to where you need it which is lower.
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  #53  
Old 10-26-2018, 12:30 AM
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Ended up doing the round trip down and back. I haven't cc'd the head and don't think I'll bother working out the comp ratio.

Squish clearance has now been opened up to 1.26mm at the edge, coming across to 1.36mm on the inside. Much better.
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  #54  
Old 10-27-2018, 10:52 PM
swazi_matt swazi_matt is offline
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Quote:
Originally Posted by Jakobi View Post
Ended up doing the round trip down and back. I haven't cc'd the head and don't think I'll bother working out the comp ratio.

Squish clearance has now been opened up to 1.26mm at the edge, coming across to 1.36mm on the inside. Much better.
Are you planning on racing this bike in a vinduro series ?!?
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  #55  
Old 10-28-2018, 08:15 AM
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Quote:
Originally Posted by swazi_matt View Post
Are you planning on racing this bike in a vinduro series ?!?
At this rate.. perhaps..

It'll be collectable.. I'll sell to you. Special deal. Rare bike!!
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  #56  
Old 11-01-2018, 10:37 PM
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I can't believe I still haven't started her yet..

Head is bolted back on..
Carb has been gone through, lil tweak to the floats but pretty good out of the box. 42 NEDW#2 175. Replaced cap bolts with allen heads. Number 7 slide with no notch. Back in the bike and ready to rock.

Pulled the guts out of the cannon of an exhaust. Interestingly no spark arrestor at all. Just a long small ID straight through muffler. Was going to take a few inches out of it, but would have required a bit more work than I could be bothered with for probably minimal reward. Put it back together for now.
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  #57  
Old 11-09-2018, 04:20 AM
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I put some fuel in her today.. just in the carby..

Kick kick kick and she's alive! Sounds nice and crispy. Makes me excite!
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  #58  
Old 11-09-2018, 05:21 AM
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Kick kick kick shoulda been click click click. No Estart?!
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  #59  
Old 11-09-2018, 05:58 AM
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Still got the flywheel cover and starter motor on the bench mate..

Along with the button that makes it all happen..

and the battery has never been in connected.. Speaking of which, how does it sit in there? Got a pic?
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  #60  
Old 11-09-2018, 07:49 AM
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On its side. Terminals up and to the rear.
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