Really bad mpg - SV650.org

28-03-10, 06:28 PM

Has anyone had any problems with really bad fuel consumption, I usually get 120 miles to the take but now I seem to get only 70 if I'm lucky.

Its all started on a rainy day when I think water got to the spark plug, I've cleared it out and changed the sparks but I seem to have a few issues since then, cold starts it can stall now and then the revs goes up and then drops out killing the engine but it seems to be running fine when warm but the main thing is the mpg is really low.

Any one come across this before?

Biker Biggles · 28-03-10, 06:39 PM

What model/year?
If its a curvy check your choke cable and choker plungers on the carbs.

28-03-10, 06:52 PM

its the newer fuel injection model k3

Biker Biggles · 28-03-10, 07:10 PM

Dont know then but I guess its running rich perhaps because the cold start system is stuck on?

Stu · 28-03-10, 07:54 PM

Yeah, I got 68mpg yesterday, I think I must be ghey

28-03-10, 07:57 PM

i think im having a similar problem :/

28-03-10, 08:54 PM

Check the fuel injectors aren't choked. You can buy a petrol fuel flush that cleans the injectors as the petrol is burned by the engine. The injected models have an auto cold start choke on them, so lift the tank, and check all the linkages. Regrease them if you have to.

Also check the air filter isn't soaking wet. If it's damp wet, then change it for a new one.

30-03-10, 09:37 AM

got the auto cold start working it seems that the problem is caused from the engine running on one cylinder when the rain got to it, need to check the sparks on both front and back, and check the coil pack to see if its firing, will let you know if the milage goes back to normal

28-03-10, 06:28 PM	#1
Robbie879 Guest Posts: n/a	Really bad mpg Has anyone had any problems with really bad fuel consumption, I usually get 120 miles to the take but now I seem to get only 70 if I'm lucky. Its all started on a rainy day when I think water got to the spark plug, I've cleared it out and changed the sparks but I seem to have a few issues since then, cold starts it can stall now and then the revs goes up and then drops out killing the engine but it seems to be running fine when warm but the main thing is the mpg is really low. Any one come across this before?

28-03-10, 06:39 PM	#2
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Re: Really bad mpg What model/year? If its a curvy check your choke cable and choker plungers on the carbs. __________________ On a clear day we stand there and look further than the ordinary eye can see.

28-03-10, 06:52 PM	#3
Robbie879 Guest Posts: n/a	Re: Really bad mpg its the newer fuel injection model k3

28-03-10, 07:10 PM	#4
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Re: Really bad mpg Dont know then but I guess its running rich perhaps because the cold start system is stuck on? __________________ On a clear day we stand there and look further than the ordinary eye can see.

28-03-10, 07:54 PM	#5
Stu Trinity Mega Poster Join Date: Jun 2006 Location: Guildford Posts: 8,027	Re: Really bad mpg Yeah, I got 68mpg yesterday, I think I must be ghey

28-03-10, 07:57 PM	#6
barwel1992 Guest Posts: n/a	Re: Really bad mpg i think im having a similar problem :/

28-03-10, 08:54 PM	#7
jimmy4237 Guest Posts: n/a	Re: Really bad mpg Check the fuel injectors aren't choked. You can buy a petrol fuel flush that cleans the injectors as the petrol is burned by the engine. The injected models have an auto cold start choke on them, so lift the tank, and check all the linkages. Regrease them if you have to. Also check the air filter isn't soaking wet. If it's damp wet, then change it for a new one.

30-03-10, 09:37 AM	#8
Robbie879 Guest Posts: n/a	Re: Really bad mpg got the auto cold start working it seems that the problem is caused from the engine running on one cylinder when the rain got to it, need to check the sparks on both front and back, and check the coil pack to see if its firing, will let you know if the milage goes back to normal