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compression pressure - when to install new rings?
Posted: Tue Jan 09, 2007 6:43 pm
by Don Smith
Folks
I'm trying to determine if my A2 needs new rings.
I measured a cold compression pressure of 90-100 psi, with the KACR
connected.
The 650 supplement gives a service range of 77-124 psi, status of the
KACR isn't given.
I don't see how 124 psi relates to the 9.5:1 compression ratio.
Any advice regarding a good compression pressure reading and when to
install new rings is appreciated.
Any installation tips also appreciated.
Thx
Don, Vancouver, BC
what does pri mean
Posted: Tue Jan 09, 2007 8:35 pm
by Kimosabe
Thanks, I agree. I was actually trying to shorten the note by
leaving out some of the mechanical variations associated with the
term primer on engines that I have seen. I couldn't begin to imagine
the number of varieties engineers have devised when considering all
the types of internal combustions engines that have been produced.
Steve In Niceville
--- In
DSN_KLR650@yahoogroups.com, Mike Frey wrote:
>
> Steve, that's a good description. However...
>
> Prime on a fuel tap and Prime on a carburetor are not the same.
>
> Prime on the fuel tap (petcock) simply bypasses the vacuum circuit.
> Flow of gas stops when the float bowl needle valve reaches its
> proper level, shutting off further flow of gasoline.
>
> Prime on a carb dumps raw fuel ahead of the slide, serving as an
> enriching device - acting as a cold start mechanism.
>
> A lot of Spanish bikes had primer (aka "tickler") buttons on the
carbs.
> My Lawn Boy mower has one.
> I think my Ossa 250 had one. Some bikes had primer buttons AND
> chokes.
>
> I guess some (but none that I know of) could have had vacuum
> petcocks, primer buttons, and chokes. So, you could turn the tap
> to prime, pump the primer, set the choke, and start 'er up.
>
> Simple, huh?
No wonder a lot of people walked instead.
>
> Kimosabe wrote:
>
> >PRI is short for prime or primer. In my limited experience, these
> >were more common on old morotcycles.
> >
> >
> >
> >
> >
>