engine will not rev after being driven on low revs

[Nick1000]

Hi

I purchased a gasgas ec300 2013 some months back. When i have been riding on low revs for some time on singletrack and trials ridning it is struggeling to rev out fully when i come out into the open. it revs but is revs unclean and does not reach maximum revs. after 3-4 runs of ful rev straights it comes back to life. have you got any tips on why this happens? i also have black oil coming out of the back of the silencer. am i running it with to much oil or do i need to set up the carbertor differntly? i am greatful for any help i can get.

[n_green]

You are way too rich off the bottom. I'd guess you are running standard jetting. The bike will load up with fuel off idle and then be that rich it can't rev out properly. Have a look at the jetting thread and see what others with your bike are running. Spooge has nothing to do with oil ratio so don't worry about that.

[Nick1000]

Originally Posted by n_green

You are way too rich off the bottom. I'd guess you are running standard jetting. The bike will load up with fuel off idle and then be that rich it can't rev out properly. Have a look at the jetting thread and see what others with your bike are running. Spooge has nothing to do with oil ratio so don't worry about that.

Thanks alot for this information, i will take a look at the jetting thread!

[Niall-griffiths]

I have the exact same problem with my bike unless i keep it on the pipe it does this ! and wont clear until i run it hard for a while i have little time to look at it tho but was told it sounded like rich jetting let me know how u get on !

[Nick1000]

i checked the manual and as i am running in sweden where we have 5-8 degrees celcius right now the recomendation is to tighten the mixture screw. This however enrichens the mixture wich seems to be in the wrong direction. I will however try this at the weekend and will get back with info how it works out.

[Jakobi]

The stock needle is too rich for the new engines and AS2 carbs. Gas Gas has changed a lot of the bike over the last 10 years but somehow still thinks the same jetting is good enough.

In saying that, even with what I would typically run on my 2010 model, I am finding doesn't quite work on the 2013 even though the engines are setup very similarly. Even running at what I would consider to be quite lean on the needle position I'm getting a bit of spooge although it could just be burning off excess as the last ride where I chugged around a lot I had it dripping from the silencer/pipe join down onto the swingarm. I'ma blame that 4 stroke can! Q stealth spooge trap.

[n_green]

It's never cold where Jake lives either.

[Simmo737]

Boys, boys, it was 34 at the Nock on Tuesday and quite humid, so "tropical" conditions believe me, my riding mate had just got over the flu and was sweating like a carnie with a mortgage!

[sweeper]

Originally Posted by Nick1000

Hi

I purchased a gasgas ec300 2013 some months back. When i have been riding on low revs for some time on singletrack and trials ridning it is struggeling to rev out fully when i come out into the open. it revs but is revs unclean and does not reach maximum revs. after 3-4 runs of ful rev straights it comes back to life. have you got any tips on why this happens? i also have black oil coming out of the back of the silencer. am i running it with to much oil or do i need to set up the carbertor differntly? i am greatful for any help i can get.

More then likely you are loading the bike up due to a rich mixture as previously stated.
A couple things to check.Is the filter over oiled or saturated with moisture also previously stated..Is their water in the float bowl.Drain it into a clean clear container.If you see any water at all drop the bowl and clean it.The reed cage could have water trapped in it,doesn't take much.Is the silencer packing failing.Is the perforatef tube in the silencer broken?Some other things to look for.

[n_green]

As mentioned you can swap and change oils til the cows come
home but unless you change your jetting your symptoms will remain.
Choose an oil based on price/smell/performance whatever then jet to suit.