Pinasco mixture ratios
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Ossessionato
Joined: 22 Oct 2011
Posts: 4372
Location: Tega Cay, SC
Mon Mar 16, 2020 10:13 am quote
I know nothing of tuning, so please bear with me. I recently installed a Pinasco 177 iron two port kit on my 66 Sprint and was wondering what the great minds on here think of the suggested mixture ratios. The sheet I got with it says 0-500KM to be run with a 3% mixture staying under 3/4 throttle. 500-1000 KM mix is at 2.5% mixture. A number 8 spark is spec-ed as well. I figured with a higher than 2% mixture , larger jets than usually are needed to protect from a slightly lean condition caused by the higher oil to gas ratio. Also, to have to go a full 500Km on a 3% mix seems a bit excessive to me. But then, I know nothing. Looking for any guidance as I sure as heck don't want to seize this. Thanks for reading ans suggestions.
Molto Verboso
08 GTS 250, 79 P200E, 62 Allstate
Joined: 11 Jan 2006
Posts: 1483
Location: Florence, OR
Mon Mar 16, 2020 10:27 am quote
I'm no help but following. I may do the same for my 62 Allstate. Are you running a 20/20 carb? It'll be helpful to know the outcome of what you come up with.
bodgemaster
1963 GL, 1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 5144
Location: So Cal
Mon Mar 16, 2020 10:56 am quote
Quote:
The sheet I got with it says 0-500KM to be run with a 3% mixture staying under 3/4 throttle. 500-1000 KM mix is at 2.5% mixture. A number 8 spark is spec-ed as well.
Iíd follow Pinascoís recommendations. They know better than any of us do what their product needs for break in. Yes, jetting will be slightly higher to compensate for extra oil.
Hooked
'65 Sprint 177
Joined: 28 Oct 2013
Posts: 425
Location: Dorset, UK
Mon Mar 16, 2020 10:56 am quote
Hey Tierney,

I run a 65 Sprint on a Pinasco 177 iron two port kit. Ive used 2% for six years+ and all seems fine. Mines also got a 24/24 carb and SIP 1 Road.
'Hopefully' thats all you need to know
Kevin

PS Im in the UK so not sure if that makes any difference wrt Petrol quality??

Edit: Thinking way back when I installed it I vaguely remember 3% for m aybe 300 miles. Either way I took the advice of Pinasco on their provided sheet...which was in Italian...which I dont read
Hooked
1960 Allstate VNA, 1962 VNB
Joined: 19 May 2014
Posts: 129
Location: Cambria, CA
Mon Mar 16, 2020 12:10 pm quote
Tierney wrote:
The sheet I got with it says 0-500KM to be run with a 3% mixture staying under 3/4 throttle. 500-1000 KM mix is at 2.5% mixture. A number 8 spark is spec-ed as well.
The kit I received didnít come with a sheet. Is there any more information that I am missing?

Can you take a picture or scan the sheet and post it?
Molto Verboso
1979 P150X, 1983 P200E, 1987 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1820
Location: Veria, Greece
Mon Mar 16, 2020 12:19 pm quote
All depends on jetting. If the carb is set for a 2% a mix of 3% will be actually leaner...
bodgemaster
1963 GL, 1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 5144
Location: So Cal
Mon Mar 16, 2020 1:04 pm quote
True, but his earlier carb setting isnít really relevant since itís a newly installed kit. Heís starting from scratch.
Ossessionato
Joined: 22 Oct 2011
Posts: 4372
Location: Tega Cay, SC
Mon Mar 16, 2020 2:10 pm quote
Im running a 20/20 Spaco carb, 116/BE3/160 main stack, 38/120 idle. timing at 20 degrees BTDC as per Pinasco specs. FNG see if this works for you. The rest of the sheet has to do with actually installing it.

DSC00453.JPG

Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 7408
Location: Victoria, Australia
Mon Mar 16, 2020 9:22 pm quote
This is the really important information you need. From SoCalGuy -
SoCalGuy wrote:
...jetting will (need to) be slightly higher to compensate for extra oil.
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold)
Joined: 06 Dec 2010
Posts: 3195
Location: Bangkok
Mon Mar 16, 2020 10:29 pm quote
Could it be that the staying under 3/4 throttle is to allow for the fact that the mixture is leaner because of the extra oil?
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 356
Location: Rochester, Minnesota
Tue Mar 17, 2020 2:29 am quote
waspmike wrote:
Could it be that the staying under 3/4 throttle is to allow for the fact that the mixture is leaner because of the extra oil?
I would say it has more to do with keeping the rpm down while breaking the cylinder in.
Ossessionato
Joined: 22 Oct 2011
Posts: 4372
Location: Tega Cay, SC
Tue Mar 17, 2020 7:31 am quote
I'm just surprised how long they want the break-in to go on. It doesn't really take that long to break in a set of rings - 30 miles probably at the most. But I guess these rings nowadays might be harder than the older ones used to be and they are erring on the side of caution - a lot of caution.
Enthusiast
1979 Vespa P200E, 1965 Allstate
Joined: 19 Jan 2016
Posts: 68
Location: Claremont, CA
Tue Mar 17, 2020 7:54 am quote
I have the same kit and ran 3% for over 1000 miles until a plug fouled. After that I went back to 2% plus a little extra.
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