Timing advance

[biggun6ss]

If I advance my timing do I need to bump up my jetting?

[2003LimitedBanshee]

You'll probably get mixed responses on this, but here is my $.02 I did go up one jet size after advancing my timing 4 degrees. The plugs were actually just slightly lighter tan, after going up one size (+4 degrees), than they were before w/o timing advance. I also cut in a little Trick race fuel. The need for race fuel is generally only due to increased compression, but for extra insurance I mixed in 20% just make sure I had a little more stable fuel charge to help cope with the advance.

Edited October 6, 2005 by 2003LimitedBanshee

[biggun6ss]

Well I am running 310s. I think it will be enough, I might just richen up my oil/fuel ratio. I am currently running a 32-1 mix. Should have my timing plate tomorrow. If it's not freezing I will have to go test it out

[2003LimitedBanshee]

If you richen up your oil/fuel ratio (ie. 24:1 compared to your current 32:1) you will effectively be leaning out your jetting. Essentially you will have more oil less fuel (leaner). If you don't want to mess with jetting, I probably wouldn't run a higher ratio of oil. Leaner = more heat (also more power unless it sticks because its too lean).

[biggun6ss]

I meant that I will be adding less oil to the gas mixture. Not more oil to the gas mixture. Sorry if I confused you.

[2003LimitedBanshee]

Oh my bad... Yeah, if I was going to change mix ratio that would be the way to go as opposed to more oil.

[scuba147]

with +4 degrees timing i left the jetting alone and check the plugs a few times--came out nice and tan as before--just to be safe bump it up a size

[trex banshee]

if you run 24:1 instead of 32:1 that will be richer more oil as opposed to some guys running 40:1 or even 50:1 is leaner you got it backwards.

[biggun6ss]

So 50-1 is 50 parts fuel to 1 part oil right. So if I am currently running 32 parts fuel to 1 part oil and go to 40-1 I will be adding more fuel to the mixture. Won't that make it run richer?

[2003LimitedBanshee]

Yes you are richening your air/fuel ratio, by running less oil. I think where the confusion started is by richening your oil/fuel (implies oil-to-fuel ratio), you would be saying you were going to run more oil per 1 part air, which in turn leans your air/fuel, less fuel more oil. Wording is crucial, it was just a mix up on what was trying to be said.

[biggun6ss]

Ill try harder to word it right next time. Im still new to the two stroke world. Thanks for thehelp though

[1.6i]

i'm looking into maybe advancing my timing also,

 

Whats the cost of a timing plate?

 

How many degrees should i go with, I was thinking 3?? since its relativley stock..thanks..

[biggun6ss]

I got mine off ebay for 42 bucks shipped. Everyone says to go +4. I am going to play with it a little and see what works best. You can get one from Ricky Stator for the same price. In fact, I think the one I bought is a Ricky Stator Timing Plate, dont know if he sells them on ebay or not though.

[1.6i]

[2003LimitedBanshee]

I was looking at a Pro Design or Trinity billet timing plate, but they are around $100, plus nobody ever sees it anyway. The Ricky Stator (what I've got) is cast so it's not all shiny, but you won't see it, plus you don't need the strength of billet. Mine was $45 w/shipping and I had it at my door three days later. You will probably need to clearance the mounting ears for mounting the timing plate to the case. Fit is just a little too tight. Don't try forcing it in, you'll probably break the ears off (this will make more sense when you see the piece). I used an air pistol grip sander with a Roloc sanding disc, made quick, neat work of it and it slipped right in. I run 4 degrees, heard people running as much as +5 on stock port. +4 seemed to really make it rip, prolly go +5+?? after porting.