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45 mph can't be top speed (Read 250 times)

Arnold Serious Thumper Offline The dude abides... Posts: 896 Westchester, NY Gender:	Re: 45 mph can't be top speed Reply #15 - 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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Re: 45 mph can't be top speed
Reply #16 - 08/07/13 at 05:39:40

Arnold wrote 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?

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.

Someday I will be old......But not today!

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Arnold Serious Thumper Offline The dude abides... Posts: 896 Westchester, NY Gender:	Re: 45 mph can't be top speed Reply #17 - 08/07/13 at 05:44:03 Then I guess riding in prime would be the next test.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18095 Camp Springs, Kentucky Gender:	Re: 45 mph can't be top speed Reply #18 - 08/07/13 at 05:46:46 Arnold wrote on 08/07/13 at 05:44:03: Then I guess riding in prime would be the next test. Yep.
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BobR YaBB Newbies Offline Who said retirement has to be boring?? Posts: 39 St. John's, NL Gender:	Re: 45 mph can't be top speed Reply #19 - 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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PhantomII Junior Member Offline SuzukiSavage.com Rocks! Posts: 96 Tampa, FL Gender:	Re: 45 mph can't be top speed Reply #20 - 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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Re: 45 mph can't be top speed
Reply #21 - 08/07/13 at 07:19:30

PhantomII wrote 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.

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.

Someday I will be old......But not today!

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6stringsamurai YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 11	Savage still tops out at 45 Reply #22 - 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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Re: 45 mph can't be top speed
Reply #23 - 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?

Someday I will be old......But not today!

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