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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Horrible gas mileage. /cgi-bin/YaBB.pl?num=1680151013 Message started by LuigiFromCars on 03/29/23 at 21:36:53 |
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Title: Horrible gas mileage. Post by LuigiFromCars on 03/29/23 at 21:36:53 Hey everyone. I just recently got an 01 savage. It didn’t run when I bought it, but after a carb clean, changing the petcock, and changing the oil( it was full of gas from the leaking petcock) it’s back in the road. The bike only has 1800 miles on it 150 of which have been me. Anyways I’m habitant a myriad of issues, oils dumping out of the head seal, leaking forks and a clutch slipping in higher gears. I think I sealed the fork today with a seal mate(thanks to this forum for putting me on), the clutch I’m assuming is due to old springs so I’m putting in stronger springs this weekend, and I’m replacing the head plug. One issue that has me stumped however is my terrible gas mileage. I’m getting 25 mpg. In fairness I use it to commute to and from college and A&M campus is a free for all for pedestrians crossing the street so I spend a lot of time stopped. Regardless, I feel I should at least be in the low 40s. The carb has brand new stock jets from alls balls, I plan to change them soon but I’d like to get working right first. I can’t imagine the rings are that far gone on an 1800 mile bike so I really don’t know where to look now. To cover the bases, I have mobile 1 4T 10w40 it’s designed for wet clutches. I don’t notice any fuel leaks, I do smell some gas when at low rpm but I believe I shaved my white spacer too far (it backfires) but I had bad gas mileage before ever doing that. Thanks in advance for any help |
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Title: Re: Horrible gas mileage. Post by verslagen1 on 03/29/23 at 23:30:39 What jets are you using? What's is the white spacer thickness? Is that the mpg after the petcock change? |
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Title: Re: Horrible gas mileage. Post by Dave on 03/30/23 at 03:10:12 How many miles long is the commute? Is it all city traffic and low gears? |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 03/30/23 at 05:08:13 2B382F2E313C3A38336C5D0 wrote:
It’s at about half thickness, but this gas mileage was a problem before ever doing the white spacer. I changed the petcock when I was fixing the bike, so yes this petcock is the only thing I have to compare to, it’s a vacuum petcock but there is no leak through the vacuum line, I pulled it and it’s dry. Current jets are whatever they are factory, it’s from the carb rebuild kit from “all balls” off revzilla |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 03/30/23 at 05:08:57 5B606D7A6B677C7A6169647B080 wrote:
Yes, it’s all city, from my apartment to campus |
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Title: Re: Horrible gas mileage. Post by twhitus on 03/30/23 at 06:41:16 If the clutch is slipping at 1800 miles it might be because the clutch was contaminated by the wrong oil before you got it. Also its very important to run a oil with zddp in it or you will wipe the cam, most of us run shell rotella t4 or t6 for this reason and its also safe for the clutch. 25mpg is pretty bad, i beat on mine pretty hard and it still does better then that. You state that you smell gas at low rpm, does it load up and die if you idle to long? your float might be adjusted to high/sticking and its dumping into the engine some basically flooding it. |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 03/30/23 at 07:28:13 75766968757472010 wrote:
No it doesn’t die if I idle too long, the gas smell may be from me shaving too much off the white spacer, but I had bad gas mileage before that. If the plates are contaminated I’d have to replace them entirely right, there isn’t much that can be done as far as I know. |
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Title: Re: Horrible gas mileage. Post by verslagen1 on 03/30/23 at 08:05:13 53727C75501D0 wrote:
It’s at about half thickness, but this gas mileage was a problem before ever doing the white spacer. I changed the petcock when I was fixing the bike, so yes this petcock is the only thing I have to compare to, it’s a vacuum petcock but there is no leak through the vacuum line, I pulled it and it’s dry. Current jets are whatever they are factory, it’s from the carb rebuild kit from “all balls” off revzilla [/quote] If it's from a rebuild kit then it's not whatever from the factory, there are many years and many locations requiring many variations in carb settings. And as noted earlier, the jets fit in many locations, best to check and know. Usually, cutting the white spacer w/out setting the main and pilot correctly 1st is generally what causes poor mpg. |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 03/30/23 at 09:10:44 253621203F3234363D62530 wrote:
It’s at about half thickness, but this gas mileage was a problem before ever doing the white spacer. I changed the petcock when I was fixing the bike, so yes this petcock is the only thing I have to compare to, it’s a vacuum petcock but there is no leak through the vacuum line, I pulled it and it’s dry. Current jets are whatever they are factory, it’s from the carb rebuild kit from “all balls” off revzilla [/quote] If it's from a rebuild kit then it's not whatever from the factory, there are many years and many locations requiring many variations in carb settings. And as noted earlier, the jets fit in many locations, best to check and know. Usually, cutting the white spacer w/out setting the main and pilot correctly 1st is generally what causes poor mpg.[/quote] I guess I didn't even consider the rebuild kit having the wrong main. were the differences that significant to where my gas mileage is effectively halved from what it should be? Regardless, I have other jets, I have the factory jets (not the ones from the rebuild but the ones I pulled out), then my main jets I've got a 147.5, a 150, and a 152.5. For pilots ive got a 52.5 and a 55. I'm ruining a dyna exhaust (the factory exhaust got gutted by the last guy and was embarrassing to ride with) so from what I've read I should probably go with the 150 main and 52.5 pilot as a starting point as im at 250' above sea level. Also, side question, is quoting the person you reply to how its supposed to be done, seems like the threads will get long EDIT: I looked the kit up and it is designed for the 01, ill still change the jets in the event that maybe they gave me the wrong ones but im fairly confident that the jets are good. I'll pull the plug as well and check if its running rich too be sure |
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Title: Re: Horrible gas mileage. Post by verslagen1 on 03/30/23 at 11:48:35 5C7D737A5F120 wrote:
most likely your problem is the white spacer. I'd thicken it up. and then follow the procedure outlined in the jetting threads in the tech section. Quote:
It's going to vary, sometimes there can be a lot of responses so you can easily loose what you're responding to especially when it's complicated. |
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Title: Re: Horrible gas mileage. Post by Gary_in_NJ on 04/03/23 at 06:33:56 If you are communing mostly in the city, you probably aren't even using the main circuit. The main begins to enter the fueling circuit at about 2/3 throttle and is in full effect around 3/4 throttle (supported by the needle). More likely is that you have accidentally swapped the main and pilot. |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 04/03/23 at 06:43:02 444E4A404B42464F111713230 wrote:
The main and the pilot don’t have the same threads, the is a #250 jet that runs the vacuum for the needle that can go in the main spot. I took it all part this weekend and the main jet was a 147.5, bike actually felt lean at the top end too so I swapped it for a 150. I don’t normally get into the top end anyways of course. The pilot is a #52.5, I pulled the plug and it shows no signs of running rich |
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Title: Re: Horrible gas mileage. Post by ohiomoto on 04/03/23 at 20:10:44 Facts: Top end is lean but MPGs are down. But there was fuel in the oil and the clutch is fried at just 1800 miles. You smell fuel when idling which means you smell it when you're not moving. Some of your symptoms are conflicting. It's clearly not a jetting issue. But fuel is going somewhere and it has been found somewhere so... Where the fuel would go if an overflow line were to get plugged into the vacuum manifold??? :o I'm thinking it would be taking a sip right off the top of the float bowl. Just a hunch, but it would explain most of the symptoms. |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 04/04/23 at 05:18:25 3631303634362D36590 wrote:
My overflow lines are running just up and forward near the tank. That’s how they were when I got the bike. But that does make sense that it could be leaking out of the overflow. Perhaps the bowl is filling too high. I’ll get some clear fuel line and see what level it’s at |
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Title: Re: Horrible gas mileage. Post by ohiomoto on 04/04/23 at 18:20:21 Yeah, I was going to say to check your float level along with the needle and seat but went with the mad scientist suggestion instead. But you have to wonder if that could have possibly happened to someone, somewhere. haha |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 04/11/23 at 09:23:38 Here are a couple of updates. Changed the oil again to see if there was fuel in the oil. It’s all good now. I set my valve clearances, cleaned the carb (again) checked the jets, they are the right size, nothing is in the wrong place. Also checked the spark plug, doesn’t show running rich. I’ve looked up and down for fuel leaks and cannot find them. I think the next thing to check is compression |
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Title: Re: Horrible gas mileage. Post by ThumperPaul on 04/11/23 at 12:26:48 Check the air box for gas. I had a similar problem. Mine was the needle valve in the carb (did you replace that)? Mine was intermittently leaking and it took a while for me to figure it out. It wasn't so bad that it would flood the bike, but it was leaking enough to smell gas in the garage occasionally after sitting over night. I replaced it and the problem was solved. It has like this little seat gasket around it that was worn. I blame myself because when I rebuilt the carb, I skipped replacing it. Lesson learned - no shortcuts. |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 04/11/23 at 21:27:27 1C203D25382D3A18293D24480 wrote:
So I replaced the needle but not the brass piece it sits in. The screw that holds the brass piece in on mine is stripped to hell. Perhaps a screw extractor is in order |
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Title: Re: Horrible gas mileage. Post by ThumperPaul on 04/12/23 at 05:56:42 Every 5 minute job is a stripped screw away from being a day long project. Good luck. Maybe you can get a small vise-grip on it. |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 04/12/23 at 06:02:59 5569746C7164735160746D010 wrote:
Yeah I’ve got another screw for it and the needle valve seat, I may just tape off the jets and take a screw extractor to it |
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Title: Re: Horrible gas mileage. Post by ThumperPaul on 04/12/23 at 06:26:53 I’ve got a strong hunch the valve seat is the culprit. Hoping that solves it! |
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Title: Re: Horrible gas mileage. Post by DragBikeMike on 04/12/23 at 11:47:26 Instead of struggling with that little screw and risk wrecking the carb, why don't you simply test it. Remove the float bowl, hold the float up to seat the needle, turn on the gas and observe the joint in question. Keep the float held up for a couple of minutes to make absolutely sure that the needle valve doesn't leak and the o-ring around the seat doesn't leak. If you don't observe any fuel leaking, then those components are OK. Sure would be a shame to trash the carb trying to remove that teeny weeny screw. Have you checked the float to make sure it isn't full of gasoline? Sometimes the floats spring a leak and fill up with gas. That makes the float less buoyant and throws the float level way off. |
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Title: Re: Horrible gas mileage. Post by LuigiFromCars on 04/12/23 at 11:51:01 1B1D126E6C6B6F5F0 wrote:
good idea, i'll try that. As for a leaking float, I checked that when I rebuilt the carb. I put the float under water and there were no air bubbles escaping. As for the seal, I do recall it being ok when I took the carb apart. Due to being unable to get the seat out I tested it with the needle and by blowing in the fuel intake. It sealed when I did that so it may be ok |
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Title: Re: Horrible gas mileage. Post by ThumperPaul on 04/12/23 at 12:28:25 4667696045080 wrote:
good idea, i'll try that. As for a leaking float, I checked that when I rebuilt the carb. I put the float under water and there were no air bubbles escaping [/quote] Smart idea Mike, but I personally prefer to remove the carb. Trying to work in the bowl while it's on the bike - I find it a pain in the behind (or I drop a screw down under the starter because I didn't use a catch rag - doh!) When he said the screw was stripped, that also seemed like a clue. My guess is some newbie tried to tighten the screw to fix the leak. To be cleared about my issue - it was a worn out o-ring. I should have been clearer initially. |
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Title: Re: Bad Gas mileage Post by LuigiFromCars on 04/11/23 at 21:45:46 I ran a compression test today and I was sitting around 135 psi, I put some oil into the cylinder and I hit about 140 ish psi. I know 140 is the lower end of the compression range but it is within that range. I’d like to rule out other possibilities before pulling the head |
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