Plug chop pics
Plug chop pics
Hi, last year i melted a hole through my piston at finke running a 172 main. Sure dont want to make that mistake again so I have gone back to a stock barrel with no porting and cast piston both oem. Can anyone please advise me on which main would be the best going by the following pics? I followed "spanky's jetting 101" to set the pilot and airscrew then did plug chops using 178, 180, 182. All started with clean plugs and I held it full throttle through all gears until it topped out and held the kill switch. The lighter side of the plug was facing the exhaust port. I think the 178 and 180 are a bit lean and the 182 a bit rich which will prob be fine for finke as there is a fair few sections where your ringing its neck. Just after some others opinions as i'm definately no expert. Last year I was running 30:1, These tests were done using 50:1 fully synthetic. Carb is a PWK 39.5mm
Next question, Does anyone run 50:1 or should i drop it back to 40:1? 40:1 will lean it out a little i guess
Cheers
182
180
178
Next question, Does anyone run 50:1 or should i drop it back to 40:1? 40:1 will lean it out a little i guess
Cheers
182
180
178
In order to read plugs correctly, you have to be able to see down deep, they say you can use a 10X loop, most just sacrifice the plug and cut it to remove the threads and expose the entire porcilin.
Here is a little info, http://www.strappe.com/plugs.html
If the pictures don't work, you can see them here http://www.pilotodyssey.com/PO/viewtopic.php?f=9&t=870
Hope this helps, if it were me, I would get it where you think it is right and fatten it up a little
Here is a little info, http://www.strappe.com/plugs.html
If the pictures don't work, you can see them here http://www.pilotodyssey.com/PO/viewtopic.php?f=9&t=870
Hope this helps, if it were me, I would get it where you think it is right and fatten it up a little
Gen 2 AF, yes it's a SH, so I can call it an AF Damm it!
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- iggys-amsoil
- Posts: 3602
- Joined: June 1st, 2007, 6:09 pm
- Location: Just North of March Airfield CA
If you went back to stock everything a 172-175 should be since.
It maybe the needle, try riching the 3/4 range of that. cgj to a dgj or 1368 to a 1468.
It maybe the needle, try riching the 3/4 range of that. cgj to a dgj or 1368 to a 1468.
Trinity Racing mild porting FMF
62 pilot, EGH needle, 172 main
03 Gen III CR250 frame
2013 Dodger Charger 5.7 Hemi
http://www.prisonplanet.com
Your Amsoil Customer # 350882
62 pilot, EGH needle, 172 main
03 Gen III CR250 frame
2013 Dodger Charger 5.7 Hemi
http://www.prisonplanet.com
Your Amsoil Customer # 350882
for what finke is a 172 main jet is no where near big enough i run a 175 for mx in western australia to put finke into context for our american friends finke is a desert race 170kph+ top speed
only posties ride 4 stroke hondas
goldfields sheet metal fabrication
98 yzfr1
05 crf 500 race tech goldies
2010 rmz 500af
01 banshee
goldfields sheet metal fabrication
98 yzfr1
05 crf 500 race tech goldies
2010 rmz 500af
01 banshee
- Rhino89523
- Posts: 1230
- Joined: November 18th, 2010, 1:45 pm
Agree entirely . . . there's something about West Aussie air, I reckon. Mine nipped up on a 172 main in the Lancelin dunes. 175 is crisp, 178 makes me breath easy, so I'd be running 180 for Finke or the Gas Dash . . .gregrobo wrote:for what finke is a 172 main jet is no where near big enough i run a 175 for mx in western australia to put finke into context for our american friends finke is a desert race 170kph+ top speed
o.t.h.e.r . . . . .Over The Hill Enduro Rider
Everyone needs to remember a few things....
1. In OZ, our winter is their summer.
2. In OZ, their gasoline may be completely different.
3. In OZ , they all ride "Upside Down"
4. In OZ, Repairs cost 3x as much as here in the States.
A old racing proverb states.... " In order to finish first...... one must first finish"
I say run her rich..... and hang on!!
1. In OZ, our winter is their summer.
2. In OZ, their gasoline may be completely different.
3. In OZ , they all ride "Upside Down"
4. In OZ, Repairs cost 3x as much as here in the States.
A old racing proverb states.... " In order to finish first...... one must first finish"
I say run her rich..... and hang on!!