mash 250cc fuel injection problems

[roger77]

My bike with 1500kms has a bad case of the "jerky throttle" in 1st and 2nd gear.
I believe this could be down to the FI system acting as a on /off switch at small throttle openings. A common FI problem it seems
Obvious faults like chain tension and throttle cable back lash have been checked
Any one know if a throttle tamer would solve the problem??

[pepperami]

[roger77]

Thanks for the reply, yes the bike is new but I am in France for a couple of months with the bike.
Was looking for a diy solution as I am using the bike every day.

[Rogerborg]

Have you considered looking for a Workshop section?
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Polarbear]

A Mash going wrong

Linuxyeti will be along to tell you they are the bestest bikes in the whole wide world and never go wrong.

So
____________________
Triumph Trophy Launch Edition

[linuxyeti]

[Rogerborg]

#VictimBlaming
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[linuxyeti]

[Rogerborg]

I do hear that some EFI bikes (not mine) have a problem with snatchy throttles.

Those would be bad bikes, that should be sorted out by the manufacturer or dealer.

#Victim

#Blaming
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[linuxyeti]

[Rogerborg]

I can't really see how a device that fiddles with the cable pull will fix a binary fuelling issue.

If it's an overly lean mixture problem, there are other h4x available, like dicking with the air temperature sensor to make the bike think its colder than it really is.

If I had to take a guess at it out in the wild (i.e. France) I might be minded to disconnect the O2 sensor (if it has one) based purely on it apparently working for the Versys.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[roger77]

thanks for the replies. This is my first FI bike and whilst I can reduce the throttle snatch with a small amount of clutch control and a light touch on the throttle its still a pain
I will try a local French dealer and let you know if there is any progress

[garth]

Depends on how sophisticated the system is, but if it's the same as the versys (as mentioned above) of you turn the key whilst holding the starter button down so it doesn't have time to go through its cycle it reverts to a richer safe base map.
____________________
You ain't a has been if you never was

[Polarbear]

[roger77]

Just a quick update on this problem.
A new throttle position sensor has been fitted and the bike now rides without any throttle jerks or other problems
Thanks to all the posters for your advise and help

[Rogerborg]

Thanks for the followup, it's good to get closure.

How easy was it to get the TPS? Was it sorted out under warranty without any quibbles?
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[linuxyeti]

[roger77]

TPS was fitted under the 2year warranty by North Cornwall Motorcycles, the Mash dealer.
Bike runs well now its fully run in (occasional 70mph down the A30)

[Rogerborg]

Dammit Great success!
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike