Ktm 300 stalling

[rhys1005]

Hi BCF

Took my ktm 300 green laning sunday with another member off here and it preformed well (not like it'd matter - I'm not exactly the most skilled rider ) apart from the fact as soon as I let the clutch out it bike would stall every single time and even sometimes if I was riding slow on technical stuff in first gear. It was really frustrating and meant I had to keep it in first gear to prevent it from stalling.. Leading to me hitting the powerband when it wasn't exactly wanted

Is this just a 2 stroke thing or is it a problem with the bike?

[P.]

Were you actually revving it? My 200 likes to have some decent throttle and slipping of clutch

[rhys1005]

Trying to but this was on steep downhills where eve rolling was a bit too quick for me. Can the 2 stroke enduros not rely on the little engine braking they have? Even accelerating if the revs were low enough it would stall.

Could a loose chain cause this? My chain is very loose at the moment, maybe not having enough tension means at low rpm the engine isn't under enough load if that makes sense? Or maybe the idle/mixture? Idk maybe it is the nature of the bike

[Dischord]

You will know if you have a loose chain as you will hear chainslap - a kind of knocking/tapping noise when accelerating from low RPM. It's really common on KTMs and it's important not to overtighten the chain. With the amount of suspension travel these have you can easily damage the countershaft. Just see how tight your chain gets when you sit on the bike to see the effect

I don't think your problem is a loose chain though, I would say it is fueling, the 300 should have more than enough torque to chug off from really low speeds in most gears.

I would start by removing the float bowl off the carb and thoroughly cleaning the main and pilot jets. Does the bike idle ok? and if you rev it fast off idle does it bog down at all?
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2012 KTM EXC 250

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[P.]

Engine braking = closed throttle = no lube.

[_Iain_]

Got a Gopro/gaffa tape and a phone w/camera?

Record the problem on video, post and go from there. Paddys 200EXC spluttered and coughed like it was going to stall and cut out till it came on power. Then it tried to wheelie and did wheelslips and all sorts of other stupid things. Apparently this is normal for one of those - I found it hard to adapt my riding style to suit, yet the 144EXC I feel very comfortable on regardless of surface.

J.M did seem to struggle with the concept that the 2t 144EXC diddn't work at all below around half throttle that constant blipping was required and not a smooth steady throttle opening, however having not ridden a 300EXC (and the character difference between the 144 and the 200's was incredible) I'd not like to put it down to operator error or a mechanical problem without actually seeing the problem, as the 300EXC is quoted as having quite a torquey motor.
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[G]

It sounds like Paddy's 200 does need a bit of poking.
My 200 didn't pull that well at low revs, but unless you were in top gear, it still pulled smoothly.

The 300 should pull VERY well from low revs. I'd say it was better than my Husaberg 501 and definitely better than the high-geared KTM 690 (but that engine started as a road bike engine.)

Downhill on a competition bike I tend to pull the clutch, or make sure it gets an occasional blip to ensure it gets some oil.

First thing I'd do is clean the carb.
Then I'd consider whipping the head off and seeing what that looks like - very easy to do on a smoker.

[stevo as b4]

Id think a 300cc 2smoker that's properly jetted and set up, and running on ok fuel (not stale or got water in it from standing etc) should pull like a tractor from low rpm.

Whats your idle speed set to? and has anyone ever played with the pilot jet or airscrew. I'd be checking all the carb settings and the float height etc, and give it another go.

Really big 2strokes generally have got not much bottom end or top end power, but a mountain in the middle, but I'd not expect a KTM300 to be that extreme like say an old open class MX'er.

[Fladdem]

I've rode a TY250, OK not a high strung enduro bike, an old school trials bike, but that thing pulled better than my TTR does. I should imagine other people would have a better idea, but I would guess jetting too, try a plug check.

I wish I'd made it on sunday.
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Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.

[rhys1005]

It idles fine, infact really well in neutral and on the road it feels like it has a decent bit of low down power. But say for example if I was rolling downhill with the cluth out, it would stall very easy.. Even without pressing the rear/front brakes.

I will mess with the mixture settings and idle tomorrow aswell as cleaning the float out etc and see if it helps. I adjusted the 'power valve spring thing' today as it was screwed all the way out, I screwed it all the way in and noticed the front felt a lot lighter when pinning it.. Not sure exactly what it did though but it was fun

Reason I noticed it so much aswell is because I heard even from just idling it can move along nicely kinda why I bought the bike.. Oops..

[G]

Oh; don't go down long hills with the throttle off - you're also starving the crank and piston of oil.
This is the main disadvantage for 2 strokes to my mind - but well made up for by being lighter, more flicable and so on.

It may be that the revs are being forced too low if you're in a highish gear.

[Fizzer Thou]

I have seen it mentioned on https://www.ktmforum.co.uk/forum.php about how a frayed reed valve can cause all sorts of fuelling problems - and about how the OEM plug cap gives no end of ignition problems.

On my 450EXC I replaced the OEM plug cap with one from NGK and have never had an ignition problem again,unlike several people that I know with similar bikes.Their starting and running issues were solved by replacing the plug caps with the better quality NGK item
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