More low down power and smoother midrange

[Tonibe63]

Hi folks, a Gas gas newbie here and yes my first post is a plea for help-doh!!
Traditionaly I'm a 4 stroke trailrider who likes lazy riding and easy traction so it may come as no suprise that I'm not getting on with my 2008 EC250. I love the chassis, suspension, brakes, weight, ergos etc but I can't get on with the very on/off nature of the engine and the way it breaks traction waaay faster than my old reactions can cope with.
So is there anyway I can get more bottom end delivery, less stalling and a smoother more linear mid range? I don't mind losing a bit of top end as I don't ride at that sort of pace.
The bikes an 08 EC250, with an FMF gnarly front pipe, DEP rear silencer and the dual ignition switch isn't connected. It was running 12/48 gearing which I have changed to 13/48 which has helped a bit.
It's been suggested that I retard the ignition timing-would this help and if so how do I do it?
It's also been suggested that I fit 2 base gaskets to reduce the compression and alter the port timing-again would this work?
I've rebuilt a few engines over the years from singles to V8's but when it comes to 2 stroke tuning I'm lost so any help is much appreciated.

Thanks.
Tony

[stainlesscycle]

13/52 gearing will help.

what is your jetting currently? jetting can change power delivery drastically.. sometimes just a needle position change can give you the power you are looking for..

retarding the timing may or may not be enough to give you the grunt you are looking for..

[wence]

Fly wheel weight?

[HenrikSchmidt]

I recently switch from a 250CRF to a 250EC and had just the same problem,
I found that a ajustable powervalvecover is a good way to do it, then you can turn your power up again if you need it, even higher than stock

[eff]

Originally Posted by stainlesscycle

13/52 gearing will help.

what is your jetting currently? jetting can change power delivery drastically.. sometimes just a needle position change can give you the power you are looking for..

Or change the needle. If it is one of the triple tapper needle, n1ef or so, it will hit much harder. Look for a single taper like a CCK or try a James Dean jetting kit. When I went to the LTR needle (not available now) it mellowed my bike out.

[HuskyDude]

Originally Posted by HenrikSchmidt

I recently switch from a 250CRF to a 250EC and had just the same problem,
I found that a ajustable powervalvecover is a good way to do it, then you can turn your power up again if you need it, even higher than stock

...Now I wonder where a guy might pick one of those up??

[rosco]

Originally Posted by HenrikSchmidt

I recently switch from a 250CRF to a 250EC and had just the same problem,
I found that a ajustable powervalvecover is a good way to do it, then you can turn your power up again if you need it, even higher than stock

Where do you get those at? I think I need one.

[jefgil123]

All you need is the CCK needle from Sudco.com $6 = bike becomes very linear.
I have a slower - acting throttle on mine and like it. $25 from Motion Pro. "CR" Throttle

A 10-12 oz.Flywheel Weight will also help A LOT if you have the 3.5 inch diameter ignition. The engine seems to like it a lot- just runs better. Don't do the base gaskets, it will run worse for low end- absolutely.
Don't mess with the timing, the switch does this for you (almost no difference).
Some like the Large Volume Power Valve Cover from "trusty.com"

You will LOVE it (IMHO).
Jeff Gillis

[Dude]

Originally Posted by HenrikSchmidt

I recently switch from a 250CRF to a 250EC and had just the same problem,
I found that a ajustable powervalvecover is a good way to do it, then you can turn your power up again if you need it, even higher than stock

I have to say it cant go higher than stock only lower. Just like a wastegate with a controller it cant go under spring pressure set at the gate. All you can do is add more tension to open it later. Can't remove tension.

What i mean basically is you can make the valve open later but not sooner than stock.

[HenrikSchmidt]

Originally Posted by Dude

I have to say it cant go higher than stock only lower. All you can do is add more tension to open it later. Can't remove tension.

What i mean basically is you can make the valve open later but not sooner than stock.

But if you reverse the force and "help" the valve to open it will open sooner and and the power is full all the way up.

I know the one from trusty.com, but i dont like to make the mods that is needed to fit it.
I have fabricated my own ajustable cover that's almost a bolt on, plug and play thing, I'm still testing it, but so far it have been working just the way I hoped.