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2002 Speedfight 2

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andyjonc
Two Stroke Sniffer



Joined: 20 Mar 2012
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PostPosted: 14:23 - 05 Aug 2022    Post subject: 2002 Speedfight 2 Reply with quote
The issue:

My scooter bogs out and has a horrible flat spot between slghtly open throttle and fully open.

Things I've done:

I have tried both the original (clean) air filter and an aftermarket cone filter, happens with both.
I have recently renewed the exhaust baffle (to get through MOT).
Fresh fuel and oil checked.

Question:
Does anyone have an ideas what could be causing the issue?
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ThunderGuts
World Chat Champion



Joined: 13 Nov 2018
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PostPosted: 14:45 - 05 Aug 2022    Post subject: Reply with quote
Sounds to me like a carb problem. I'd clean the carb thoroughly and try again. Do you have a fuel filter? What state is the inside of the fuel tank (assume it's steel), i.e. any rust/gunk? Has the bike been sat unused for any period of time recently?
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andyjonc
Two Stroke Sniffer



Joined: 20 Mar 2012
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PostPosted: 16:02 - 05 Aug 2022    Post subject: Reply with quote
ThunderGuts wrote:
Sounds to me like a carb problem. I'd clean the carb thoroughly and try again. Do you have a fuel filter? What state is the inside of the fuel tank (assume it's steel), i.e. any rust/gunk? Has the bike been sat unused for any period of time recently?


In my hast to get the post... posted.. I forgot to add that it is a brand new carb and fuel filter.

The tank is plastic. The scooter has sat for a while, but it has fresh fuel and has been ridden a few miles now following passing the MOT.

But the almost binary power delivery is a bit of an issue, it goes, then lags, then gets power when you open the throttle. When in traffic or basically not WOT, it stutters
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Easy-X
Super Spammer



Joined: 08 Mar 2019
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PostPosted: 17:15 - 05 Aug 2022    Post subject: Reply with quote
Brand new carb... any old carb or one specifically for this scooter, i.e. with the correct jetting?
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter
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andyjonc
Two Stroke Sniffer



Joined: 20 Mar 2012
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PostPosted: 09:20 - 06 Aug 2022    Post subject: Reply with quote
Easy-X wrote:
Brand new carb... any old carb or one specifically for this scooter, i.e. with the correct jetting?


the carb was ordered online and the speedfight 2 was listed as compatible model. I assume it has the correct jetting (I know one should never assume...)
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 10:13 - 06 Aug 2022    Post subject: Reply with quote
Why did you replace the carb in the first place? Were you the one who left it parked up or did someone else?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050
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andyjonc
Two Stroke Sniffer



Joined: 20 Mar 2012
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PostPosted: 19:05 - 07 Aug 2022    Post subject: Reply with quote
Nobby the Bastard wrote:
Why did you replace the carb in the first place? Were you the one who left it parked up or did someone else?


It has been a project bike of mine for some time. It has been started & runs pretty regularly but because it didn't have MOT I couldn't (legally) test ride it out on the open road.

Now it has MOT I have been on a few rides and noticed the bog. I replaced the carb with a new unit because the on the old one I noticed that the inlet pipe for the oil feed was actually broken so I was concerned that 2T oil was not going in (altho it probably was).
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Old Thread Alert!

The last post was made 3 years, 237 days ago. Instead of replying here, would creating a new thread be more useful?
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