Originally Posted by Doc Brown (Post 195239)

First ride 2020 yesterday. I jetted the bike exactly the same as my previous bike (300 EC 2019) and the fuel consumption is far too high.

I wonder why the fu*k I can get all my mates bikes right just struggle with me own one. Bloody hell!

20? C, 300 EC 2019

MJ: 180
PJ: 42
AS: 2
JD-RED: #3

Consumption was 3,75 liters for 29,7km in easy terrain, but only gears 1 to 3.
That's too high. My previous bike at the same track with same jetting would have used 2,75 liters.

Yes, my float height is right and the bike didn't spill any fuel, I also have the overflow hose looped acc. JD's recommendation...:(

I wonder if the smaller PJ 40 would help but fear to get the bloody lean hang after steep climbs :rolleyes:

Originally Posted by Jakobi (Post 195242)

Efficiency! Head mod all the way. Squish clearances can be all over the shop. Nice tight tolerance, jet and forget!

Originally Posted by Doc Brown (Post 195248)

I know what you're talking about but first want to see if I can get it right without opening the engine.
Problem is our borders are still closed and I can not test on my common play ground and have to wait when my friends buddy allows us to ride on his land... :o

Originally Posted by hannesd (Post 195249)

i opened my own cilinderhead too at no costs.
at least you'll get an idea of the squish, if you at least have some solder at your home? i did this and then just put a thinner base gasket and the bike runs amazing now (even better then before) i went from 1.2mm to 1mm squish on my '15 ec 200.
the base gasket was cut from a gasket sheat i had laying around and happend to be exactly what i needed,so lucky me :D

so start by measuring your squish or you'll be chasing a ghost...

Originally Posted by Doc Brown (Post 195273)

Nah Hannes, it's not necessary to measure the squish at this moment. It's a carb problem not an engine problem. I need to get out 10km per liter at least. Currently the engine uses about 1,3 liters per 10km.
It's easy to reduce the fuel consumption I was just wondering why all 4 other 300's I jetted the very same way used around 1 liter per 10km but the only one that drinks is mine.

I'll simply try a needle that's a half clip leaner and/or reduce the pilot jet from 42 to 40. I will get this right in less than an hour but the real problem is: I can't ride at the mo...

Thanks for your help, much appreciated!

Originally Posted by Doc Brown (Post 195273)

Nah Hannes, it's not necessary to measure the squish at this moment. It's a carb problem not an engine problem. I need to get out 10km per liter at least. Currently the engine uses about 1,3 liters per 10km.
It's easy to reduce the fuel consumption I was just wondering why all 4 other 300's I jetted the very same way used around 1 liter per 10km but the only one that drinks is mine.

I'll simply try a needle that's a half clip leaner and/or reduce the pilot jet from 42 to 40. I will get this right in less than an hour but the real problem is: I can't ride at the mo...

Thanks for your help, much appreciated!

Originally Posted by Jakobi (Post 195277)

It's an engine problem.. not a carb problem.

Same carbs, same jetting specs..

Inefficient engine for sure!

Originally Posted by hannesd (Post 195281)

have you concidered you might be loosing all that excess fuel?
did you loop the overflow line to prevent some of the loss? (graham jarvis mod)

also, we shouldn't discuss this here, this is THE database ;-)
maybe start a new thread? and mod can erase previous posts to keep it "clean"? :-p