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**Bryan Glynn** · 07-08-2002, 09:39 AM

Can't say for sure what your carbon patterns should look like on a basically stock ski - You should have some, but I'm not sure you will get very defined patters, none to worry about anyway.

I think your pop-off is WAY low - why did you drop it??

**Tazass** · 07-08-2002, 02:32 PM

Cuz I read and some people hinted that I would need to drop POP for new flame arrest/removed chokes. Maybe not...

Tim

**Bryan Glynn** · 07-08-2002, 02:57 PM

It totally depends on what ski, and what FA you are going to and from. I think you need to raise it at least 5 psi.

**imported_Tim** · 07-08-2002, 04:50 PM

I agree with Bryan! Your pop off pressure should be around 16 lbs to work the best. If your engine is calling for more fuel at low speeds due to the carb mods you have done than richen the low speed Jet itself. Trying to fine tune with pop off pressure is very difficult to maintain consitancy in your fuel burn(color) on the piston. Also what type of Oil are you using and are you pre-mixing your fuel. If you are than remember that oil in the gas pulls the fuel octane rating down and can cause detonation. The type/amount of oil you are using can also cause different readings on the plug and the piston then you are use to seeing. Some parafeen based oils leave a black residue on the piston top after combustion, and could also be what you are seeing. Try using a different fuel also, as gas with additives will also burn with a different color of ash, usually the more additives in the fuel the more ash left on the piston. By additives I mean what the Fuel company has blended with the current fuel you are using to meet the Federal Emmision Standards. Fuel blended for Northern Michigan is different then the fuel sold in Florida!

**Tazass** · 07-08-2002, 10:41 PM

I am premixing with regular (I think 83 octane) pump gas and Penzoil 100% Synthetic. Should I use a higher octane fuel?

**Bryan Glynn** · 07-08-2002, 11:07 PM

83?! Can you even buy that in the US? Use 87.

**Tazass** · 07-08-2002, 11:49 PM

its 87, I said I think [img]/graemlins/cwm27.gif[/img]

**imported_Tim** · 07-08-2002, 11:57 PM

Since you are premixing your fuel I would recomend nothing less than 89 octane. Try mixing 92 octane with what you have in your tank now and see if you plug color changes. Have you cut your heads or checked your squish clearance ???

**Tazass** · 07-09-2002, 01:38 PM

Got engine from sbt, sure they did all the cutin and squishin it needs. I just want to put fuel/oil in it and drive :D

**Tazass** · 07-30-2002, 08:47 PM

Well, I raised the PO pressure back to 16psi(stock). It made idle a bit smoother but the lows speed screws had to go from 1 turn to 2 turns out (stock = 1/2 turn out), to get good response when I snap the throttle. It still loads up, and has a slow return to idle, and white smoke when at idle. What else can I do? I already went up low jet size from 70 to 75. Should I keep going up in sizes until low speed screws are around 1 turn out and it doesn�t load up?? Wouldnt think removing the choke plates and new flame arrest would be such a change. Old stock flame arrest looked pretty restrictive free so new arrest I wouldnt think it would affect it so much...argh. Getting good at taking carbs off thou [img]tongue.gif[/img]

Thanks
Tim

[ July 30, 2002, 07:51 PM: Message edited by: Tazass ]

**Bryan Glynn** · 07-30-2002, 11:49 PM

70 to 75 may have not been enough. If you could have tuned it to 2 turns out I'd say ok, but it sounds like you are still lean. Keep going.

**Skexies** · 07-31-2002, 03:06 PM

I have to agree... go for a larger jump on the jets, try 80-85 down low... then work on the highs.

[ July 31, 2002, 11:18 PM: Message edited by: Skexies ]

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