RZ/RD 350 & Misc. 2-Stroke Tech BBS

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PostPosted: Sun Aug 12, 2018 12:32 am 
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Joined: Mon Aug 20, 2012 1:37 am
Posts: 1805
Location: Calgary, Alberta
hondaror wrote:
Looks great!

On the plus side, the larger squish will add years to your engine's top end life. Shaved heads on the LCs were like making your engine a time bomb.


Shhhhhhhhhhh :smt004

Mine aren't shaved but they are running pretty minimal squish with the O-rings.

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'81 RD350LC hybrid project bike - in pieces currently
'82 RD350LC in '81 colours - Built by "Solo 2" OEM pipes, UNI filters
'90 RZ350F2 with 31K motor, OEM F2 pipes & airbox


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PostPosted: Sun Aug 12, 2018 12:36 am 
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Location: Calgary, Alberta
graham heise wrote:
Put the bike back together after a tidy up and paint job. Just need to check over everything and add the fluids. Pretty happy with how it's turned out. Just need to ride it. ImageImageImageImage

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Looks GREAT :smt023

I like the flatter bars rather than the nasty OEM riser bars. Makes the bike feel more engaging to ride.

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'81 RD350LC hybrid project bike - in pieces currently
'82 RD350LC in '81 colours - Built by "Solo 2" OEM pipes, UNI filters
'90 RZ350F2 with 31K motor, OEM F2 pipes & airbox


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PostPosted: Sun Aug 12, 2018 3:05 am 
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Joined: Sun Sep 16, 2012 7:10 am
Posts: 230
Location: gold coast Australia
I rode the bike today to meet up with some other lc owners. Same engine set up as before paint work except now with factory head gasket and a measured squish of 1.6mm instead of the 1mm squish before paint job ( copper gasket). Definately flatter through the rev range. The bike used to power wheelie at 6500 when it came onto the pipe, now it doesn't. Also the bike ran hotter, needle past the half way point where before stayed under. There is probable only a few hp in it but it definately went better with a tighter squish, better throttle response to.
ImageImageImage

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PostPosted: Sun Aug 12, 2018 3:10 am 
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Joined: Sun Sep 16, 2012 7:10 am
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Location: gold coast Australia
Heres a photo of piston top when the squish was at 1mm
To me it looks like the squish band is keeping the combustion away from the edge of piston. These barrels have had the exhaust port raised around 1.5mm, so i think the tighter squish returns some of the lost compression from the raised port. Compression test on this engine was 135psi both cylinders. Image

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PostPosted: Sun Aug 12, 2018 11:18 am 
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Joined: Mon Aug 20, 2012 1:37 am
Posts: 1805
Location: Calgary, Alberta
Wow, 4 LCs together. We never see that here.

The squish band is supposed to shove the fuel-air into the dome.

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'81 RD350LC hybrid project bike - in pieces currently
'82 RD350LC in '81 colours - Built by "Solo 2" OEM pipes, UNI filters
'90 RZ350F2 with 31K motor, OEM F2 pipes & airbox


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