deltron63

My Marder misses on full throttle. I've changed the plug, stripped and cleaned the carb and fitted a new gasket. The carb is set at the factory settings.
I've fitted a K&N filter and a samba exhaust , is this causing the problem?

Monsterman--HBF

My Feedback: (28)

Air Leak??

deltron63

where abouts?

dubby

Around the filter. if anywhere.

Have you retuned the engine to compensate forthe pipe and filter?

deltron63

Do you think it should go richer to compensate for the extra air?
What needle should be adjusted L or H

dubby

Without hearing it its hard to say but id give it 1/8th turn weaker on the high end to start with.

arjwhite

Deltron63 your`e running to lean mate stop before it all goes pear shaped.Turn the high speed screw(the one to the left marked H) one 1/8 to one 1/4 anti clockwise at a time till it runs sweet if this dosn`t cure you have one major air intake leak.

ibstar

if its lean i thought you wanted more fuel ? so turn the needle out (anticlockwise (left))
not in (clockwise) that will make it even leaner ?

dubby

A rich engine will make it couch and splutter, hence my suggestion of weakening it

deltron63

what it to be then chaps, richer or leaner?
i think i should start of rich then lean it out a bit.
on tick over and normal throttle it fine, only when i give it the big one it spluttters.

arjwhite

Ibstar if this reply is meant for me i did say anticlockwise?I just can`t see a two stroke engine with a free flowing pipe and fillter,on standard carb settings,running rich.Although i have Known to be proved wrong.

dubby

Weaken it out 1/8th turn mate.

deltron63

Rich it is then.
thanks.

arjwhite

Yes first go anticlockwise to richen the mixture as this will do the motor no harm.Go leaner on an already lean motor and it will sieze/break/cost money to fix.

dubby

Now im getting bloody confused

arjwhite

You and me both.

deltron63

So what is it to be then?
I know lets have a vote

BILKO1

Go anti-clockwise on the H needle first this will richen the top end but will not damage the engine, if it runs worse go clockwise this will weaken/lean the mixture.

dubby

your best bet is to ignore me

FGUK

Well what do you know??? Hahahaha........... Drago 2!!!


That's what happens when you take those magic mushrooms!

dubby

LOL

Bet im right though

ammdrew

when lean it will seem like it stutters on the top end.
when rich it will be dull and just not sing on the top end.

digger95

hi i had the same problem
so i changed head gasket,carb gaskets and insulator block,,,
did the job ..... the way i checked it is set needle valve back to factory set and if u have to richen the low end to get it to tickover slow enuf u have defo got an air leak

Lee G

I had a similar problem after changing the air filter.
Had not put the carb gasket in place properly

Now if its the cy engine you have, it might need the carb cleaning out

deltron63

The latest up date on the missing:
I warmed the engine up, took it for a high speed pass and the vioce in the back of my head said " take it over the big jump". I shouldn't have listened. it came down on it's arse and did loads of damage!
It should be fixed by the weekend, so i'll try again.