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 $$$$$$$$ FREE SHOP MANUAL’S $$$$$$$$$$ 
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Post Re: Service manuals
Do you really think that's something that you'd find in the service manual ??
If I did find the number.or.numbers ... what would you do with that information ??
That's kinda an odd question ??
zooomie wrote:
for someone with a service manual.
what is the air/fuel ratio for the c3/50f?


I'm just saying ... if someone told me what that number was ... I wouldn't know what to do with it.
I don't think that it's a static# ... I think that it changes over the whole power band from idle to WOT.

I guess that I'm looking forward to seeing someone WITH KNOWLEDGE ... answer this !! !!

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Wed Jun 20, 2012 3:01 pm
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Post Re: Service manuals
I guess there is nothing you can really do with the numbers, just curious as to how they have the ecu set.
I don't see why it wouldn't be in the manual since it ks technical info.
I like to know as mjch as I can about my engines.


Wed Jun 20, 2012 3:18 pm
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Post Re: Service manuals
found it
http://en.wikipedia.org/wiki/Yamaha_XF50X


Wed Jun 20, 2012 3:22 pm
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Post Re: Service manuals
oops, mksread that.
compression ratio is 12-1


Wed Jun 20, 2012 3:30 pm
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Post Re: Service manuals
I didn't see an air/fuel ratio #
I did see a compression ratio 12:1

Still ... now that you know what it is ... what do you plan to do with that bit of information ? Are you planning on shaving the cylinder for more compression ? I hope that you consider EVERYTHING as an alternative.

What are you planning ?

zooomie wrote:
oops, mksread that.
compression ratio is 12-1

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Wed Jun 20, 2012 3:44 pm
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Post Re: Service manuals
I wasn't looking for the comp ratio, but while were on the subject, can the comp ratio be adjusted as easy on a 4t as it can be on a 2t?


Wed Jun 20, 2012 9:22 pm
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Post Re: Service manuals
zooomie wrote:
I wasn't looking for the comp ratio, but while were on the subject, can the comp ratio be adjusted as easy on a 4t as it can be on a 2t?

There's lots of parts $$ $$ $$
different heads, pistons/cylinders, cranks.

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Wed Jun 20, 2012 9:26 pm
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Post Re: Service manuals
I was thinking more along the lines of squish clearence. I assume it would be more difficult on a lc vs ac. On my 2t zuma, it was all about the gasket.


Wed Jun 20, 2012 9:30 pm
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Post Re: Service manuals
The compression ratio can be adjusted by one of several means.
#1 a higher dome piston
#2 a smaller combustion chamber
#3 a shorter deck height{the distance between the piston top and the combustion chamber top} {usually done by shaving the head in a milling machine}
#4 use a longer rod
As far as I know nobody makes a high compression piston or a longer rod but there are shops that will custom fabricate them. Redesigning the combustion chamber would require a large amount of engineering and a very good machine shop. The third method is the only one that is fairly easy and cheap{be careful that the valves do not hit the piston!}. Sometimes just using a thinner gasket can give a little more{but not much}.

The stoichiometric air to fuel ratio for a gasoline engine is 14.7:1 but very few engines run that lean. Most are 12.5:1 - 13.5:1, being a fuel injected scoot it is probably closer to lean than rich. Manufacturers rarely list this number by the way. The best way to find out is to use a fuel/air meter.

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Wed Jun 20, 2012 9:47 pm
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Post Re: Service manuals
if compression is too high, it results in pre-ignition. When maching a head or rasing compression by the aboce methods, how can you be sure that it isn't going to fail? I guess it really isn't worth playing with unless you are dragracing...


Wed Jun 20, 2012 10:21 pm
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Post Re: Service manuals
Not worth playing with ??
Well ... that would mean that there is no desire for a few of the aftermarket parts available.
But then ...
BBK & stroker cranks are meant for LARGER DISPLACEMENT.

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Thu Jun 21, 2012 5:21 am
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Post Re: Service manuals
For some reason I can't get it to download. Could some one email me the pdf for a 04 Zuma 50 to catchingchrome@gmail.com
Thanks
Pete

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Mon Jun 25, 2012 9:43 am
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Post Re: Service manuals
Find DerHan's signature line. He has a number of links to Manuals right there.

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Tue Jun 26, 2012 3:18 pm
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Post Re: Service manuals
You are exactly correct ... took me less than a minute to download that ... Thanks !!

2004 Yamaha Zuma 50

2002-2011 Yamaha Zuma 50

scooter commuter wrote:
Find DerHan's signature line.
He has a number of links to Manuals right there.

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Tue Jun 26, 2012 3:49 pm
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Post Re: Service manuals
Guys if you want service manuals go to this site right here;

http://thescooterprofessor.proboards.com/index.cgi

You name it they got it including zuma, vino, C3 and other Yamaha manauals. Got to register to view them.


Tue Jul 24, 2012 4:33 pm
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