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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> 45 mph can't be top speed /cgi-bin/YaBB.pl?num=1375839424 Message started by 6stringsamurai on 08/06/13 at 18:37:04 |
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Title: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 18:37:04 Any one know why 45 in third gear is the fastest my 87 savage will go mind you i creamed the heck out of the carbs but i couldn't get the long pin like jet out? |
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Title: Re: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 18:38:46 Cleaned not creamed and when i shift into fourth it slows right down to about thirty Amy help would be much appreciated |
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Title: Re: 45 mph can't be top speed Post by EJID on 08/06/13 at 18:44:45 Make sure your rear brake isn't adjusted too tight...for starters :D |
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Title: Re: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 19:38:15 Ill check to make sure but it accelerates just fine it just tops out at 45 and that's in third when i shift into fourth it slows down back to thirty ish |
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Title: Re: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 19:41:13 Maybe a carb issue still or someone mentioned timing but this is my first bike so i'm not really sure what to look for at all but I'd like to avoid paying a mechanic out the A if possible |
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Title: Re: 45 mph can't be top speed Post by verslagen1 on 08/06/13 at 20:03:19 where are you located? |
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Title: Re: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 20:06:43 upstate ny... Syracuse |
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Title: Re: 45 mph can't be top speed Post by verslagen1 on 08/06/13 at 20:21:34 not a lot of people up there that can help you. have you checked your petcock? |
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Title: Re: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 20:39:18 What about it? it pours fuel freely to the fuel line and i have tge other line coming from the carb to the other opening on the petcock i believe that's where it goes but connected or not i still only get 45 mph |
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Title: Re: 45 mph can't be top speed Post by verslagen1 on 08/06/13 at 21:01:11 do the test... http://suzukisavage.com/cgi-bin/YaBB.pl?num=1251932429/1 |
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Title: Re: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 21:10:49 awesome ill try it first thing in the morning thanks a lot for the help! |
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Title: Re: 45 mph can't be top speed Post by Serowbot on 08/06/13 at 21:56:36 This is a vacuum petcock... it does more than allow fuel to flow... It sucks... literally... it uses engine vacuum to open the flow... When this goes bad,.. it sucks air and leaks fuel... This causes all sorts of problems... That is why, it's our first check in any fuel/running problem... It must be ruled out 100%, before testing anything else.... A stock Savage should easily go well past 80,.. and be pushing 90mph before petering out... ...45,... is a moped... |
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Title: Re: 45 mph can't be top speed Post by 6stringsamurai on 08/06/13 at 22:04:00 I'm going to plug them and see what happens but can you explain exactly what that does? And i only way 160 so this bike should have no problems doing 90 with me on it |
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Title: Re: 45 mph can't be top speed Post by Dave on 08/07/13 at 04:33:37 66232422393E3723313D25223139500 wrote:
When the diaphragm in the stock petcock fails, it can allow fuel and air to enter the engine through the vacuum line that attaches to the inlet tract on the right side of the carb.....which will negatively affect how the engine runs. It is also possible that the failed diaphragm can prevent proper fuel flow to the carb through the fuel line that attaches to the left side of the carb.....which will negatively affect how the engine runs. By disconnecting and plugging the vacuum line, and turning the petcock to "PRIME" - you are bypassing the vacuum operated feature of the petcock. If the petcock circuit is not plugged with crud from the fuel tank, this test should allow you to have a normal fuel flow. The test is not a permanent fix however.....as you will not have any reserve feature and can run out of gas. |
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Title: Re: 45 mph can't be top speed Post by ToesNose on 08/07/13 at 04:49:47 Also what type of air cleaner are you running, some of the pod/cone filters block a vent port on the carb intake. |
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Title: Re: 45 mph can't be top speed Post by Arnold on 08/07/13 at 05:33:31 If it was a problem with the petcock he would not be able to rev high in neutral either. Can you do that? |
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Title: Re: 45 mph can't be top speed Post by Dave on 08/07/13 at 05:39:40 70657E7D7D74657463110 wrote:
Idling or revving the engine while standing still takes very little fuel. It is possible that the petcock is not providing a good fuel flow when the bike is under a load and the engine vacuum is low. When you put a sustained load on the engine and start to use fuel.....it can empty the float bowl if the petock is not flowing well. |
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Title: Re: 45 mph can't be top speed Post by Arnold on 08/07/13 at 05:44:03 Then I guess riding in prime would be the next test. |
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Title: Re: 45 mph can't be top speed Post by Dave on 08/07/13 at 05:46:46 4653484B4B42534255270 wrote:
Yep. |
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Title: Re: 45 mph can't be top speed Post by BobR on 08/07/13 at 06:39:27 Mine would cut out and be hard to start. I tried prime and it works. Got Raptor to replace stock one. |
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Title: Re: 45 mph can't be top speed Post by PhantomII on 08/07/13 at 06:53:16 When did they start putting these vacuum driven petcocks on motorcycles, I have been out of riding for a long time and my last motorcycle was a 1988 Nighthawk 750 and it didn't have one of these failures waiting to happen petcocks. |
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Title: Re: 45 mph can't be top speed Post by Dave on 08/07/13 at 07:19:30 1A222B243E252703034A0 wrote:
I used a 1972 Suzuki GT550 tank on my Cafe' conversion.....and it had a vacuum operated petcock on the tank. I looked at the parts list for the 1968 T500 Suzuki.....and it uses a vacuum operated petcock. The problems with the vacuum petcock on the Savage seems to be related to 2 seperate issues: 1) Making changes to the engine that decrease the vacuum, incease horsepower combined with running at high speeds - This causes the vacuum petcock to provide too low of flow for the operating conditions. 2) Problems with the diaphragm deteriorating prematurely. It is a common (but not universal) belief that the ethanol mixed into the fuel is a contributing factor. Additives dumped in the gas tank, method of seasonal storage, and environment could al be contributing factors. |
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Title: Savage still tops out at 45 Post by 6stringsamurai on 08/10/13 at 18:42:50 So I've tried plugging my vacuum hose from the petcock and the hole on the carb and that didn't work I still can't get my 87 savage over 45 any other ideas |
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Title: Re: 45 mph can't be top speed Post by Dave on 08/10/13 at 20:04:52 You haven't told us if this problem recently occurred.....or is this something the bike has always done since you owned it? We don't know how long you have owned this bike. You haven't yet told us if you have the stock air cleaner or not. Did you set your petock to PRIME after you plugged the vacuum hose and capped the carb nipple? How long does it take to fill an 8 oz cup with gasoline from your fuel hose if you disconnect it from the carb? |
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