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Message started by pyke13 on 06/11/16 at 02:36:13

Title: high revs misfire
Post by pyke13 on 06/11/16 at 02:36:13

hi there, ive got a misfire at high revs. im running a 55 pilot and a 160 main, going by the colour of the spark plug and the fuel air mix screw i seem to be about right. ive removed the complete air box and fitted a k&n copy cone air filter. the exhaust is a highway hawk muffler that seems to be pretty free flowing and has had loads of holes drilled into the end plate to allow better flow.
is there a pipe from the carb or airbox i should have blanked?
any ideas???

Title: Re: high revs misfire
Post by Dave on 06/11/16 at 03:15:45

Try a smaller main jet......and see if the situation improves.

Title: Re: high revs misfire
Post by pyke13 on 06/12/16 at 11:01:36

today i went to a 155 main with the 55 pilot and things werent to bad, the miss fire is still there but not as bad. tried the 52.5 pilot and the miss fire got worse. so do i go up to a 57.5 pilot and see what happens?
it seems to be the mid range thats the problem, ive shaved the spacer down to about half, will removing the spacer altogether help?

it seems to splutter n misfire at about 45-50mph in second at full throttle, change up a gear and away we go then as the revs rise it splutters n misfires again.

someone please help with this im getting to the point where im losing interest in the bike.

Title: Re: high revs misfire
Post by justin_o_guy2 on 06/12/16 at 11:13:19

If it's RPM related, could it be ignition, ?

Title: Re: high revs misfire
Post by pyke13 on 06/12/16 at 11:34:00

doesnt seem to have a set rpm to do it at, was fine before i removed air box and fitted new filter.

Title: Re: high revs misfire
Post by KennyG on 06/12/16 at 11:56:05

Pyke,

Somewhere here on the forum is post about inadvertently covering an opening in the mouth of the carburetor with the aftermarket filters. You might want to search for it.

Kenny G

Title: Re: high revs misfire
Post by verslagen1 on 06/12/16 at 12:12:08

here you are kenny
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1183926901/0
http://cavimike.com/savagefilter01.JPG

Title: Re: high revs misfire
Post by KennyG on 06/12/16 at 12:14:46

Verslagen,

Thank you.

Is there a chance a blocked opening will cause Pyke's problem?

Kenny G

Title: Re: high revs misfire
Post by justin_o_guy2 on 06/12/16 at 12:41:45

444D5F51340 wrote:

doesnt seem to have a set rpm to do it at, was fine before i removed air box and fitted new filter.

For the sake of troubleshooting you may be ahead to put it back and see what happens.

The problem may also be what is posted above, the filter tube may be causing this.

A bit of light oil, Vaseline, on the face of the carb, install the tube, and look at it. Wherever you see it on the rubber,, that is where you are having a problem.
I don't know if it has to touch or just be close enough to diminish the flow. Since it's
At RPM, I am kinda thinking it's either not closed off, or only on one end, or just close enough to shut the flow down and mess with it.

Pop the filter and rubber tube off and go for a ride.

Don't lose interest,, it's not that bad.

Title: Re: high revs misfire
Post by verslagen1 on 06/12/16 at 12:42:37

2A23313F5A0 wrote:

You had mis fire and you went down a size in jets and it got better.
you still have a problem with mis fire in mid range and you want to remove the spacer? :-?
seems you need a name change... wong way.

Title: Re: high revs misfire
Post by batman on 06/12/16 at 13:03:20

I can't believe you're going 45-50 in second gear !! It ain't no ninja !! At that point the ign. module is fully advanced,shift to a higher gear! by 40 you should be in 3rd, by 50 in in fourth !! your exceeding the red line in second gear !! the bike's alright ,it's not so much missing as crying for help!The bike is rated for 85-88 top speed what made you think you could get half way there in second gear?

Title: Re: high revs misfire
Post by pyke13 on 06/12/16 at 14:01:12

it was doing 60-65 in second when i got it, does about 40 in first. ive had the speedo reading 95 n there was some left. not a lot just ran out of road

Title: Re: high revs misfire
Post by pyke13 on 06/12/16 at 14:25:23

read thru the post and checked my bike, looks like that is the problem.
should have it sorted tomorrow night, thanks for all the help
;D ;D ;D ;D ;D

Title: Re: high revs misfire
Post by KennyG on 06/12/16 at 17:05:02

Pyke,

What have you determined is causing the problem?

Kenny G :-/

Title: Re: high revs misfire
Post by pyke13 on 06/12/16 at 18:06:32

the air filter, same as the picture above. cheers for pointing it out to me.

Title: Re: high revs misfire
Post by Kris01 on 06/12/16 at 20:03:47

5152475E525D070B330 wrote:

I can't believe you're going 45-50 in second gear !!

There's a 30 mph stretch of road around the house. The cops mean 30, not 31! I'm in 3rd gear cruising and it feels just fine. ;)

Title: Re: high revs misfire
Post by pyke13 on 06/13/16 at 03:40:30

so i guess im the only one that likes to scare sports bikes on my savage, these big singles fly if you want them to.
ive got the 4 speed gearbox in mine, its a 1990

Title: Re: high revs misfire
Post by Savageman on 06/13/16 at 06:37:13

An easy way to check if it's the AF. Just remove the AF and ride it if problem goes away then it's AF if not then it's jetting issue. Just make sure you don't test ride it in a dust storm w/o a AF. :-?

Title: Re: high revs misfire
Post by Dave on 06/13/16 at 06:45:16

5F56444A2F0 wrote:

so i guess im the only one that likes to scare sports bikes on my savage, these big singles fly if you want them to.

No.....several of us can be scary at times. We just don't need to run at 6,000 rpm to do it! ;D

Title: Re: high revs misfire
Post by Serowbot on 06/13/16 at 07:05:17

60 to 65mph in second,... you may be going into valve float...
There's no more power up there... it's time to shift...
:-?
4 speed gearing chart...
http://i600.photobucket.com/albums/tt82/serowbot/rerun/4spd.jpg

Title: Re: high revs misfire
Post by justin_o_guy2 on 06/13/16 at 08:52:09

I ran mine hard, but once it's not accelerating hard, it's time to grab a gear.

Title: Re: high revs misfire
Post by batman on 06/13/16 at 09:04:25

If I were riding next to you on a sport bike I'd be afraid, of flying parts,you're over reving ,it could explode!

Title: Re: high revs misfire
Post by pyke13 on 06/13/16 at 14:15:06

its not over reving, when i got it in stock trim it would slow down as it ran out of revs in each gear. now its back firing at at 65 in 4th, thats no place near over reving or valve float. if it wasnt back/mis firing then yes it could be a case of over reving. im only trying to get the same sort of performance out of it i got before i removed the airbox
modified the ait filter and that has 90% cured the problem. seems to have been the rubber blocking the air flow to the diaphragm. just cut the centre out of the rubber and glued it to the metal end of the cone, even opened up the inlet side of the cone just to make sure it wasnt blocking air flow.

Title: Re: high revs misfire
Post by Savageman on 06/13/16 at 14:56:09

Have you tried putting a new spark plug in? Or it could be a bad timing pick up coil. :-/

Title: Re: high revs misfire
Post by justin_o_guy2 on 06/13/16 at 15:22:04

Clean up the cavity the plug sits in before removing the spark plug.

I would remove the air cleaner and rubber tube completely and go for a ride before I did anything..
I'm not Just wondering about how the hose/ tube fits your carb face, but I wonder if it is messing with the jetting. If this is not something that you find the answer to soon, it might be necessary to go back, install the old setup, and see if it goes back to running right.

Too many times I have done something that caused
Unforeseen consequences, and only by going back and undoing it all could I find out.

Title: Re: high revs misfire
Post by batman on 06/14/16 at 17:09:57

Cone filter&highway hawk muffler with extra holes drilled, It seem everyone new to this sight thinks this is the ultimate setup,cone& straight pipe .I think they should do a little more research.

Title: Re: high revs misfire
Post by KennyG on 06/14/16 at 17:13:51

Pyke,

Don't feel bad, you are not the only biker to miss that when installing a new air filter.

It is always good to hear of a problem sorted out.

Kenny G

Title: Re: high revs misfire
Post by Kris01 on 06/14/16 at 19:55:29

5E5D48515D5208043C0 wrote:

Cone filter&highway hawk muffler with extra holes drilled, It seem everyone new to this sight thinks this is the ultimate setup,cone& straight pipe .I think they should do a little more research.

Yep, that's not the best setup for this high torque, fairly low revs engine.

Title: Re: high revs misfire
Post by batman on 06/14/16 at 21:59:15

You said it yourself! "I'm only trying to get back the same performance I had before I put on the cone filter" duh! reverse is also a gear!AS JOG said if something you did doesn't work you need to go back and undo it.I ran into this myself I had my bike running nice with a Harley pipe and decided to try drilling a 3/8 hole in the baffle it ran horribly ,I could have tried rejetting but that wouldn't make the thing much faster so I changed it back. If your looking for speed then you have to invest in larger piston ,cam ,exhaust,etc. so you have to ask yourself is $2000 worth of parts and labor worth it to go ten miles an hour faster?For me the answer was no, it was more important that it run smoothly and reliably.

Title: Re: high revs misfire
Post by pyke13 on 06/18/16 at 16:52:32

pop riveted most of the drilled holes in the exhaust n it seems to have cured the misfire problem. cheers for all the help :)

Title: Re: high revs misfire
Post by justin_o_guy2 on 06/18/16 at 17:12:55

Yep, generally if you Fix something and it doesn't work as well, you need to Unfix it and see what happens.

Title: Re: high revs misfire
Post by batman on 06/18/16 at 18:16:51

pyke nice job !you thought it threw, not enough back pressure.

Title: Re: high revs misfire
Post by old.indian on 06/18/16 at 18:19:17

4D4E5B424E411B172F0 wrote:

Lectron 38mm carb and kit, head "blueprinted" and ported, Stage 3 cam shaft, Varsies' cam chain tensioner and head plug, new cam chain, Wiseco 10.5 compression ratio (94mm) piston, Bartlett HD clutch, custom 1.75" header and Dyna muffler, 25 tooth Kawasaki front pulley.. Total (including shop to get jug honed ) $2,200.00. :-[
Gain = 40% + Horsepower and torque PLUS increase of useable RPM to a 7,500/ 8,000 RPM redline.... NO loss in smoothness or reliability at MY touring speeds (@ 5th gear)3,600RPM (60 MPH) to 5,000RPM (80 MPH 4 passing). :-/

When you compare that to the cost of an 883 Sportster. Well 8-)

Title: Re: high revs misfire
Post by justin_o_guy2 on 06/18/16 at 18:26:51

I wanna drive it.. me, me,

Title: Re: high revs misfire
Post by batman on 06/18/16 at 20:54:21

Old Indian,When I see that a new savage costs 5700 and you put 2200 in yours for a total of 7900, a sportster for 8500 doesn't sound to outrageous .

Title: Re: high revs misfire
Post by justin_o_guy2 on 06/18/16 at 21:10:41

I can't pick up a Sportster. I don't Think I can,,

Title: Re: high revs misfire
Post by verslagen1 on 06/18/16 at 21:12:25

36353D7730373D303837590 wrote:

Quite a few riders are always looking to "up grade" their rides and that seems to always equate to quite a bit of $$$ and a new/bigger motorcycle. I'm being different and saving $$ by tweaking the S40. Given that I bought "The Thumper" in 12/15 with 3,984 miles on the clock for $1,800 complete with OEM windshield, luggage rack and set of soft saddlebags.

Yes, but you don't need to buy a brand new one to get something that you can be proud of.

Title: Re: high revs misfire
Post by batman on 06/19/16 at 12:59:57

Oh ,but you can by a used Harley (full size) all day long for 8to10,000 were I live ,Harley don't keep their value like they did years ago.My other bike is 2002 kawa voyager 1200 I payed 5800 for in '07 with 4,500 miles,sure you can buy used but I was comparing apples to apples not used to new. As for reliability,you might think about the fact that temperature has a bearing on wear and the oil in your motor helps carry away heat,Your riding in the heat of N.Mex. at 60mph with an oil pump turning 10%slower with a 15% decrease in oil pressure,this may have a bearing on your long term reliability.