Optimising standard ignition for 95 octane fuel

[johnnytheswede]

Hi everyone! So, how much is there to win powerwise by adjusting the standard ignition? I have a ported jug, coolhead 66cc. How much can i safely advance or retard the ignition to get more top end power without sacrifice reliability? Is there anything else that needs to be changed to be safe? We usually run 95 octane fuel, but 98 is also available here in Sweden at the stations.

Johnny

[Kuma]

but 98 is also available here in Sweden at the stations.

Johnny

I can't help you on your question, but that's nice having 98 octane, that is what I'd be running.

[johnnytheswede]

but 98 is also available here in Sweden at the stations.

Johnny

I can't help you on your question, but that's nice having 98 octane, that is what I'd be running.

We also have Shell V-power. It,s 99 octane=).

Johnny

[100hp honda]

i really dont think it will make a difference for you judging by what you did to your engine. most of your hardcore race engines will have the ignitions fine tuned or even make new maps but they use a dyno to see if their headed in the right direction.

[johnnytheswede]

i really dont think it will make a difference for you judging by what you did to your engine. most of your hardcore race engines will have the ignitions fine tuned or even make new maps but they use a dyno to see if their headed in the right direction.

Hello! Yes, of course the best way is to dyno it a laborate with it, but as i don,t have the possibility to do that i was thinking of how much is a safe amount to retard the ignition to get some more revs out of it together with a Dynoport pipe which i intend to order. I don,t want to go crazy, but as it, s also rebored i think it would be a good idea as it,s so strong on the bottom even though it,s ported which i didn,t thought it would be=).

Johnny

[100hp honda]

take the tab off the bottom bolt and turn it counterclockwise.

[johnnytheswede]

take the tab off the bottom bolt and turn it counterclockwise.

Ok, but shouldn,t i file the hole and put it back on? The question is how much is safe with 95 octane fuel?

Johnny

[johnnytheswede]

What is the standard setting in degrees on a -99 model?

[AlisoBob]

The question is how much is safe with 95 octane fuel?

Johnny

Until it starts rattling bad, at 3/4 throttle, in 3rd gear....

[johnnytheswede]

The question is how much is safe with 95 octane fuel?

Johnny

Until it starts rattling bad, at 3/4 throttle, in 3rd gear....

Yeah, sure;=)! Great info;=)! I know you are a man that knows a lot about these bikes so come up with the REAL info!

Johnny

[AlisoBob]

That is real info.....

The bike will tell you when its had enough timing...

Its like jetting..... what works on someone elses bike may not work on yours. You cant just pick some nujmber out of thin air.

Clydes bike might want 28 degrees, yours might want 33 degrees....

The bike will tell you.

[100hp honda]

sloting the holes just makes it so you can turn it farther. just take off the tab and it lets you turn it alittle. dont be afraid nothing will happen

[johnnytheswede]

That is real info.....

The bike will tell you when its had enough timing...

Its like jetting..... what works on someone elses bike may not work on yours. You cant just pick some nujmber out of thin air.

Clydes bike might want 28 degrees, yours might want 33 degrees....

The bike will tell you.

Ok, i thought you were joking here. I thought there was a suggestion that worked on most bikes, but if you say it,s ok i trust you. Thanks Bob.

Johnny.

[johnnytheswede]

sloting the holes just makes it so you can turn it farther. just take off the tab and it lets you turn it alittle. dont be afraid nothing will happen

Ok, so i should adjust the timing without the tab, and when i,m satisfyed i file it and put it back again? Is that what you suggest?

[2strokekyle]

Take the tab and throw it over your shoulder. Get the need to file out of your head. Pick some amount of advance or retard. Tighten stator bolts. Ride and see what it does. Adjust if nessesary.

[100hp honda]

i would leave it in the stock position. you just have regular gas and mild porting. i dont see that you would gain anything. but turn it if you want

[johnnytheswede]

Ok. That,s what i was afterr really, to know if it,s any idea for me to laborate with it at all. I would like to get some more revs out of it, and i will buy a Dynoport pipe, so my thoughts was to adjust the timing accordingly to that, but maybe i shouldn,t bother then.

Johnny

[AlisoBob]

The stock Honda timing is set for the worst gas expected, the worst jetting, and generally the worst of everything.

It not optimised in any way...

If I was going to play around with the timing, I'd do this....

1. Go get a DC powered timing light....



Their about $40 - $50 U.S.

2. Either do some math, or get the flywheel inscribed. What you want is to know how many degrees of timing you have when using the timing light.

It dosent have to be fancy, it could be as simple as having marks at TDC, 25 degrees, and 35 degrees with stock being 30 degrees.




Or make your own timing tape... lile these from MSD



wrap it around the flywheel like this...



Generally, if your motor likes more timing, it might be too rich on jetting, or the compression is low.

Most sucessful mods to increase power ( proper jetting, effective porting, correct fuel for the application, reeds, good working pipe and silencer, etc.. etc.) all want less timing.

[johnnytheswede]

Ok, That was a good tip! I,ll see how i do then. I will order the Dynoport exhaust, and maybe i,ll get satisfyed with the power anyway.
Good forum this !
Thanks everyone!

Johnny