Suzuki GN125 Running Problems....

[MrJames]

Hope someone here can help having a few problems with my suzuki GN125 for a while after starting this happens while trying to ride and when the bike is just idling if you open the throttle it revs to about 2k rpm then bogs down and trys to stall and will but if you ease off a bit it'll struggle then eventually start reving more normally.

I've replaced the carb with a copy which I've pulled apart to make sure theres nothing wrong with it and it's all fine I've checked the fuel flow from the petcock the plug is white which indicates it's running lean which is more than likely part of my problem but the carb only has an idle mixture screw.

Any ideas? Had enough of looking like an idiot with no clutch control lol

[paddlesat16]

first thing whip the plug out and look at the colour, this will tell you how the carb is running - rich-lean etc.

plug should be a nice biscuit brown colour

if black = Rich
no colour i.e white=super lean

there is a plug guidline on a sticky in the workshop somewhere.

Regards
____________________
I once saw a bloke shagging a donkey.... in Saudi arabia. Theory Test Passed 26/10/09 Mod 1 Passed 26/4/10, Mod 2 Passed 7/6/10 Current Bikes Suzuki GSX1400 K5, Aprillia Pegaso 650, Suzuki DR350T.

[Watdafukhappe...]

Here you go.

https://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

[stinkwheel]

My first suspect would be an air leak somewhere round the carb.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Watdafukhappe...]

Sorry I've just re-read your post and it says you've already checked the plug. As stinkwheel has said, check for an air leak.

Has it always done this? (i.e. since you bought it?) Was the plug fine before? If it was always like this then you should buy a pack of jets and up-jet if no air leaks are found as running lean is not good for your engine.

[MrJames]

When I first got the bike it was reving on it's own when I stripped the carb down I found holes in the diaphram so not sure what it was like before so replaced the carb with a replica I've replaced the plug and reseated the carb and checked for air leaks and can't find anything wound trying to raise the needle height work?