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Old 08-05-2015, 11:23 AM   #1
xsv
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Terrible MPG/running rich 2000 Sv650

After new sparks, fluids, and air filter, I'm still getting ~30 mpg. I should be getting somewhere between 40 and 60 mpg. I don't ride the bike hard, tires are at proper pressures, and plenty of tread left on the tires. Bike has a yoshi slip on. Most of my riding is short commutes less than 10 miles. I'm thinking the bike needs carbs cleaned, rejetting (due to the yoshi), carbs synch, and valve clearance checked/adjusted. What do yall think?


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Old 08-05-2015, 11:45 AM   #2
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I think your bike is fuel injected and that you'd have an awfully hard time rejetting.
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Old 08-05-2015, 11:48 AM   #3
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It sounds a lot like what happened to my mileage when I had a vacuum leak. Is it possible you've got a vac hose that got damaged during some other maintenance, or possibly just cracked? Check your intake boots, both between the air box and carbs and between the carbs and head as well.

Are you experiencing any other symptoms? Poor idle? Surging or bogging off idle? It seems like if it was a problem with dirty carbs you'd know it. You could probably stand to go up a couple of sizes to compensate for the exhaust (any air filter mods?), but I can't see running a little lean causing that much of an adverse fuel economy hit. Do you smell gas around the bike? I've had a small fuel leak appear to cause a similar issue. Unnoticeable when doing 100 miles/day, let it sit a few days in between rides and it looked like I was getting horrible mileage.

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I think your bike is fuel injected and that you'd have an awfully hard time rejetting.

1st gen is carbed.
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Last edited by Jae; 08-05-2015 at 11:52 AM.
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Old 08-05-2015, 11:55 AM   #4
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Wow. I read that way too fast. Thought it said 2006. Carry on with Jae's suggestions.
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Old 08-05-2015, 12:01 PM   #5
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I only bring up the fuel leak possibility thanks to the fill up frequency and relative mileage. Your short fueling interval (July 12 to July 14) showed by far the greatest fuel economy in that time range, when the bike was also apparently being ridden the most. Every other interval you allow quite a few more days between fill-ups, which is more time for fuel to leak out.

How does your oil smell? I'm wondering if you might have a stuck float (or dirty float needle) that's allowing gas to seep past into the cylinder (and past your piston rings into the crankcase).
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Old 08-05-2015, 12:23 PM   #6
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No air filter modification. I dont smell any fuel leak from the tank. Didn't notice any smell from the oil or oil filter. I think the exhaust fumes have some gas smell though, can't really tell if that's normal. Bike idles fine, starts up with no problem without choke. The fuel comsuption from July 12-14 was from riding to and from Brookshire from the medical center, mostly highway. I didnt notice any cracks in the vac hose when I changed the sparks and air filter, but i wasnt really looking closely. I did some research and some people say rejet is needed after adding a slip on exhaust if the bike seems to run rich.
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Old 08-05-2015, 12:25 PM   #7
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What the Sparks looked like when I changed them:
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Old 08-05-2015, 01:43 PM   #8
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I'm no expert on the SV (I have played with these same Mikuni carbs on a similar v-twin engine), but I've not heard of going to an aftermarket muffler making a bike run more rich.

Unless you're speaking with someone I would consider an all-around motorcycle expert (like Patrick, for example), I would probably take the advice you get on your SV forum over general advice received here, if only because you're more likely to get opinions with experience on YOUR bike.

That said, that plug color looks fine to me, if slightly on the rich side.

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Old 08-05-2015, 02:33 PM   #9
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Another thing to consider is the evaporation we all experience in this high heat when the bike is sitting. The key to having a properly running motorcycle is to ride it. Like most posts asking about a problem, you have made no mention that you have performed any regular maintenance. The plug gap is as important as the appearance. Most motorcycles requir plug replacement every 10K. I would try to run a whole tankful through in one day with a little seafoam. Don't let it sit with cleaner in the tank.

Last edited by pbfoot; 08-05-2015 at 02:36 PM. Reason: Misssed the mileage on his original post. Misspelling
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Old 08-05-2015, 03:48 PM   #10
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I ride it almost everyday. I bought the bike two months ago, and I am slowing doing all the regular maintenace. Two weeks ago, I changed the sparks, oil, oil filter, air filter, coolant, brake fluid, brake lines, and brake pads. Next is going to be the chain and sprockets.
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Old 08-05-2015, 04:26 PM   #11
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Are you sure that your bike is not jetted already? I run some big jets on the track with my full system and get gas mileage. With big jets on the street I get about 100 miles per tank or less.

For the street, I put stock jets back in to get better gas range.

Also, what size tire do you run up front? Stock tire was 120/60. I run a taller 120/70, so that throws your odometer off slightly.
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Old 08-05-2015, 05:02 PM   #12
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Quote:
Originally Posted by xsv View Post
I ride it almost everyday. I bought the bike two months ago, and I am slowing doing all the regular maintenace. Two weeks ago, I changed the sparks, oil, oil filter, air filter, coolant, brake fluid, brake lines, and brake pads. Next is going to be the chain and sprockets.
The valves would be the next logical step. If you want to reduce your cruising rpm, adding a tooth to the front sprocket when you replace them will reduce your rpms without any noticable power loss.
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Old 08-05-2015, 07:15 PM   #13
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Old 08-05-2015, 09:24 PM   #14
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Quote:
Originally Posted by Oskar_Z28 View Post
Are you sure that your bike is not jetted already? I run some big jets on the track with my full system and get gas mileage. With big jets on the street I get about 100 miles per tank or less.

For the street, I put stock jets back in to get better gas range.

Also, what size tire do you run up front? Stock tire was 120/60. I run a taller 120/70, so that throws your odometer off slightly.
Sounds right.
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Old 08-05-2015, 10:31 PM   #15
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Quote:
Originally Posted by Oskar_Z28 View Post
Are you sure that your bike is not jetted already? I run some big jets on the track with my full system and get gas mileage. With big jets on the street I get about 100 miles per tank or less.

For the street, I put stock jets back in to get better gas range.

Also, what size tire do you run up front? Stock tire was 120/60. I run a taller 120/70, so that throws your odometer off slightly.
Not sure? I'm the third owner. I asked the previous owner if the bike was ever jetted and he said he didn't know. Not sure about the front tire size, I'll check tomorrow.
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Old 08-06-2015, 07:59 AM   #16
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Quote:
Originally Posted by xsv View Post
Not sure? I'm the third owner. I asked the previous owner if the bike was ever jetted and he said he didn't know. Not sure about the front tire size, I'll check tomorrow.
I'm not sure what part of town you're in, but I'd be happy to help pull the carbs and check your jet sizes if it's something you're not comfortable with doing.

If it has been jetted with a Dynojet kit, they are notorious for going WAY too big on the main jets (in the applications I've had experience with). This thread might be of some help in figuring out a good jet combination: http://www.svrider.com/forum/showthread.php?t=48995
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Old 08-06-2015, 08:13 AM   #17
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Quote:
Originally Posted by Oskar_Z28 View Post
Are you sure that your bike is not jetted already? I run some big jets on the track with my full system and get gas mileage. With big jets on the street I get about 100 miles per tank or less.

For the street, I put stock jets back in to get better gas range.

Also, what size tire do you run up front? Stock tire was 120/60. I run a taller 120/70, so that throws your odometer off slightly.
front tire is 120/70/17

Quote:
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I'm not sure what part of town you're in, but I'd be happy to help pull the carbs and check your jet sizes if it's something you're not comfortable with doing.


If it has been jetted with a Dynojet kit, they are notorious for going WAY too big on the main jets (in the applications I've had experience with). This thread might be of some help in figuring out a good jet combination: http://www.svrider.com/forum/showthread.php?t=48995
That'd be great! I live in the medical center but I can make a ride there.
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