I'm kind of confused as to the mixing ratio of Amsoil. I'm currently mixing it at 80:1 and am getting some fouling. Most recently I've started fouling plugs. Granted the weather has gotten hotter here in the east, but that can't account for all of it.

I checked with Mike of HPD and he said to mix it at 60:1 for trail modded motors like mine. Needless to say, if I'm fouling plugs at 80:1, 60:1 ain't gonna help matters much.

I've been running a BR9ES (12:1 compression) plug in mine since the beginning of this year. I've since gone back to the BR8ES because of the fouling. Other than that can some one (other than rincon) give me some advice to stop the fouling. The motor is running nicely at high RPMs with no cutting out. The bottom end is fine too. I've noticed that it seems to be smoking a lot more than normal.

 

that sounds weird. i use the series 2000 racing oil in my injector and have never fouled a plug (knock on wood). which one of the oils are you using 100:1, injector, racing oil? gotta know what oil first

 

[img]i/expressions/face-icon-small-happy.gif[/img] Hey Mike, dont forget, If you go 60:1 you actually will lean the motor down due to the oil displacing for fuel. Also, I have not had good luck with the BR9ES (or B9ES). I was on the sand dune turning plenty of rpms and fouled a 9 fairly fast (running the 15.5:1 head). I put an 8 back in it and ran the rest of the weekend without any problems. Just my experience. I am like Ken and run the old polaris blue oil premixed at 40:1. Just my 2-cents.Bubba[img]i/expressions/face-icon-small-smile.gif[/img]

 

Mike,

I don't know what help I can offer, but I am running the Amsoil 100:1 mixed at 80:1, and have been running it for several months now. I have yet to foul a plug. One thing to remember is that if you were premixing before using Amsoil, you were probably mixing between 32:1 and 50:1. I'm sure you've thought of this, but changing to 80:1 effectively richens up your air to fuel ratio. Take a 4-stroke for example.........if you richen the jetting up enough, it will foul plugs too. So, I don't believe you are experiencing oil-fouling. Changing to 60:1 may lean out your air to fuel ratio enough to eliminate plug fouling. Just throwing some things out there. Also, I have never run the 9 series plug.

Waylan

 

You need to be looking at piston wash along with electrode readings on the plug. NOT JUST THE COLOR! I agree with Waylon, I don't think you are seeing fouled plugs from oil. You are going to have to do some carb tuning beyond just the main jet. Look at pilot, needle, slide cut aways etc.

You say it is smoking, synthetic oil is pretty much smokeless and at your ratio's there should be none! I think you are seeing rich fuel mixture in the air, not oil.

 

Whoops,

Sorry guys, I forgot to mention I was running the 100:1 type of oil. I think it is more of a problem with jets than anything. It ran nice and crisp at 65 degrees, I do know that, as it get warmer, you have to go down a jet size, but it is running crisp at lower, mid and upper throttle settings. Absolutely no popping, missing or anything that would indicate a rich mixture. Hmm, I'm going to try something else here, like not using the choke when starting.

My Sport has always started very easily when cold. The only problems I've has were because of the carb. For some reason (and this occurs with all oils) if you leave the gas sit in the float bowl longer than a week, it is hard to start. I have been draining the float bowl by running the machine until the idle just starts to increase, then shutting it down. I think the design of the 39mm PWK Kehin is the culprit. I've never had this happen with either the VM34SS or the 38mm TMX.

Thank you for the replies, it's nice to know that we can all help each other out from time to time.

 

Are you having a problem with the needle and seat leaking?

Do your float(s) seem heavy?

If the float level is too high it will pull more fuel into the engine making it run rich. Have you checked the floats or level?

 

xcrider,

No, I haven't checked the float level. I installed the carb two years ago and aside from jetting it originally, haven't touched it. It seems to run just fine now, it must have been the fact that I was running the colder plugs. I don't think I need them as my cylinder dome is ceramic coated along with the piston top.

 

<< Other than that can some one (other than rincon) give me some advice to stop the fouling. >>



LOL...That's a good one Mike [img]i/expressions/face-icon-small-happy.gif[/img]

So you solved your problem? I was just going to post and say that I have had very good luck running AMS 100:1 at 80:1 in my machine, but I guess it's no use.

Take care.

-Josh

 

After Ritter modded motor I tried the 9 also. Did not get outof my yard and fouled a plug. Put the 8 back in and everything is fine. I too run the plain Blue oil.


Ronnie