Suzuki Marauder 125 Bogging Down At High Revs

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

I have had a Suzuki Marauder 125 for a couple of months, and when I first bought it I brought it to The Mechanics and had the carbs cleaned and a new float needle installed, and the bike run like a dream.

Last week I fell around a corner at around 15 miles per hour, and the only visible damage was a cracked front light and the gear lever being bent back.

I've repaired the front light and bent the gear lever back into place, and the bike started fine and runs fine, except when I pull the throttle back past a certain point it's loses power and jerks as if it is not getting enough fuel.

I have returned it to the Mechanics yesterday, and they have taken the carbs off cleaned them and reinstalled them, and it hasn't made any difference.

They have checked the fuel flow and that is ok, and the pump is working fine, so they thought that maybe the side stand cut out was being activated at high Vibrations, so they bridged that and it didn't make any difference either.

They are now totally stumped, and so am I.

Does anybody have any suggestions in regards to what the problem might be?

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

Carbs?
When it boggs down remove the spark plug using gloves to see if it`s dry with short of fuel.

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

Back to the carb with a black dry plug.

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

[quote="jaffa90"]Back to the carb with a black dry plug.[/quote
]

The Mechanics have removed the carbs, cleaned them, and say that they are fine.

My Google research is making me think that a bad air mix might be causing it. Either a leak or a vacuum somewhere maybe? What do you think?

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

If the carb is ok and fitted correctly it could be a faulty t.p.s. not advancing the spark timing when opening the throttle thus causing a black spark plug and lack of power.

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Check for air leaks, get it running and spray around the carb/inlet with wd40, if the revs change, there is a problem.

Also make sure the airbox and shit is seated correctly, also that your filter isn't full or shit.

That will be the best bet, rather than fucking with the carb even more. You shouldn't really need to go near it.

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

"""""A road test with the throttle ignition sensor disabled has made no difference. """""
Try going up a hill with it disconnected.
Also on some bikes oil can travel from the engine into the airbox when on its side / dropped.
As Paddy suggests.

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

Also on some bikes oil can travel from the engine into the airbox when on its side / dropped.
As Paddy suggests.

There is a good chance that that happened, as when I vacumed the air filter, I had to hoover liquid out of the bottom of the box.

I don't actually understand what that means though.

Sorry for my lack of knowledge, but what difference would that make?

P. · Red Rocket Joined: 14 Feb 2008 Karma :

If you are local, I'll take a look. a mechanic that is stumped probably shouldn't be in that job Laughing

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

Have you checked the tank for fuel flow? Possible filter/tap blockage and maybe a vacuum being created in the tank? Any of them will cause high speed running problems. To check for vaccum issues open the tank filler cap. If it goes away you may have a blocked breather tube.
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james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

ThatDippyTwat · World Chat Champion Joined: 07 Aug 2016 Karma :

My 125 commuter is, essentially, a 4 valve Marauder (Hysoung Cruise 2).

Fuel line was iffy, corrugated. Supposed to be 6mm ID, but in places it was down to 2mm, and was fine at slow speeds, but bogged when you ask it for more revs or put on more load. No idea how it happened, but it went away when I replaced it. Fuel came out, but not in enough quantity/volume to suplpy the carb properly at higher revs.
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james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

ThatDippyTwat · World Chat Champion Joined: 07 Aug 2016 Karma :

james anderson · Derestricted Danger Joined: 14 Feb 2018 Karma :

ThatDippyTwat · World Chat Champion Joined: 07 Aug 2016 Karma :

You've cleaned or replaced the fuel filter? If you dropped it, all sorts of shit would get dreged up from the tank.

For the few quid it costs, I'd replace the fuel line and filter. Easy enough to do yourself, your garage doesn't seem to know any more than you, so why pay them more?

Can't see a drop fucking electrical items up.
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'98 VFR800 (touring) - '12 VFR800 Crosrunner (Commuting) - '01 KDX220 (Big Green Antisocial Machine)