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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 04-10-2016, 01:57 PM
stian stian is offline
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Default Will not reach powerband 06`EC300

I am near selling the bike. Tired of this spanish crap.

Ec300, 2006.

Carburator

AS1, 178 main, 40, 7 slide, 1,5turns out, N1EG, 2 clip from top. Have tried 180, 182 mains, 40,42,45 pilots, N1EF needle.
I have also tried changing the carburator to AS2, with 180 main, 42 pilot, 7 slide, N1EF needle, 2 groove from top.
500m over sea, 12celcius.

Reeds: 2/4 blades are new, everything is OK and in good shape.

Piston: Rings and piston are well within specs. Under 25h on piston.

Head: Shaved 1mm, this problem was also before shaving the head.

BaseGaskets: 2x0,5mm. Squish is 1,6mm +-0,2mm.

Sparkplug: New BR9EG, tried swapping with another one also.

CDI: Standard one, but tried a KTM Cdi with no changes.

Coil: Standard, tried a KTM, no changes.

All gaskets are new, new oil (GRO), new petrol (95 RON, 2% GRO oil).
New rear silencer, front is std. GasGas.

Powervalve: New bellcrank, polished powervalve parts, new bearings. Rotates easy, and I have checked that governator balls are in place.

Every seal, and every bearing is new in the engine.
New voltage regulator.
New stator last year. iginition timing is locked in position with the bracket.

I am out of ideas. Starts easy, but will not reach powerband. Powervalve is easy, so I would guess that its electrical fault, men CDI and Coil has been changed with parts I do know work fine.

Tips?


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Old 04-11-2016, 03:02 AM
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So you skimmed the head, but didn't open the chamber? 1mm will be 4cc so if I'd done that to mine I would have had 14.8:1 compression ratio. Which is a mighty high compression ratio for a 300.

Has it ever run well?

Maybe you've fixed the first issue and clouded it with too much comm?. Perhaps your local gas needs a smaller main as well.
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Old 04-11-2016, 06:03 AM
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barossi73 barossi73 is offline
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Do you have good fuel flow from tank?
Partially blocked fuel tap or inline filter could run ok idle/slow but starve engine of fuel at higher rpm.no tight bends in fuel line?tank breather clear?restricted fuel line?
(Restricted fuel flow is the only thing i can think of that you didnt mention)
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Old 04-11-2016, 07:18 AM
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Quote:
Originally Posted by barossi73 View Post
Do you have good fuel flow from tank?
Partially blocked fuel tap or inline filter could run ok idle/slow but starve engine of fuel at higher rpm.no tight bends in fuel line?tank breather clear?restricted fuel line?
(Restricted fuel flow is the only thing i can think of that you didnt mention)
Excellent point! Some filters drop fuel flow. Also make sure your floats are set correctly and make sure the carb is actually level. GG bikes put the carb on two separate angles relative to the line of the bike and float height can be tricky. While they may look level, you should check by putting a small level on the carb top flat to verify. Often you will see that it needs to be tipped further back toward the gas tank.
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Old 04-11-2016, 01:10 PM
stian stian is offline
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Carb is clean (second carb is also clean) and there is no fuel filter. Fuel is also free flowing.

The problem was there before cutting the head also. High compression or not.
95RON both times.

Can it be a electrical problem? Its an old bike. There isnt a mechanical problem as it seems.

How do I measure if the electric power is correct or not? Ive tried different working CDI`s and coils. Stator swapped last year.
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Old 04-11-2016, 06:48 PM
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Does it free rev into high rpms? Can you post a video? How does the plug look?
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Old 04-12-2016, 12:21 PM
motopsycho87 motopsycho87 is offline
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Best bet is to post a video. ive had 3 stators on mine which has killed 2 cdis. Are you running a non-resistor spark plug cap, that can cause it. Check all cable connection and earths.
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Old 04-14-2016, 04:02 AM
stian stian is offline
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Quote:
Originally Posted by motopsycho87 View Post
Best bet is to post a video. ive had 3 stators on mine which has killed 2 cdis. Are you running a non-resistor spark plug cap, that can cause it. Check all cable connection and earths.


I am not new to two strokes. Best bet isnt a video,but rather measure all electrical sources. Ive tried other plugs and cdi 's and coils.
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Old 04-14-2016, 07:13 AM
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I guess you know best.
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Old 04-14-2016, 11:05 AM
GGRider01 GGRider01 is offline
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Does it just bog and die out with the throttle wide open? Or does it rev up fine but never have a "hit" when the valve opens?

My bike never had a hit until I started changing needles..
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