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CrazyMotorcycleGuy
Most users ever online was 4,519, September 2, 2015 at 03:26 AM.
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Engine stalls on downhills.
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Kat
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Red face Engine stalls on downhills. - October 12, 2006, 06:17 PM

I managed to change out the choke and throttle cables (I've stripped a screw on the clutch cover, so that cable will have to wait). I cleaned and lubed the choke hinge (and inadvertently, the throttle hinge) and everything seems hunky dory...

Except when I test rode my '95 Katana, I discovered a problem I was having before I took my baby apart (causing me to fiddle with the choke and find out I had problems there). Here are the symptoms.

My bike surges when it idles. The rpms go up, the rpms go down. It's not a big swing, maybe 500 rpms or so, but the surging isn't regular, nor is it normal.

My bike idles at around 2K rpms on uphills, 1.5 rpms on flat ground, and it idles so slowly it stalls on steep downhills. Needless to say, having your bike stall each time you stop facing downhill can be a little freaky. This is not normal, either.

I thought that opening up the choke would increase my engine idle rpms and my bike would stop stalling. Today I realized the correlation between elevation (my driveway points uphill). I had this problem when my gas tank was full and half full (as it is now).

My oil has about 4K miles and maybe 7 months on it. It's Mobile 1 synthetic for motorcycles and the level is fine. I could use an oil change, but this problem seems stranger than that. It's an old bike that's never been garaged (though I keep it covered). If anyone has ANY clue how to fix this, please let me know.


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October 12, 2006, 06:50 PM

Clean the carbs, make sure they aren't leaking air where they attach to the cylinders and make sure the cables aren't binding anywhere.


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Kat
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October 12, 2006, 07:04 PM

The cables are fine. I just replaced them and they're smooth as silk. I have no clue how to clean carbs (I should learn, shouldn't I?). Is there a tutorial on this most basic of tasks?


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October 12, 2006, 07:59 PM

I can't think why the atitude of the bike would make a difference other than perhaps a problem with the floats or float level. You can check that when you clean the carbs. If you have a service manual, it should walk you through it. If not, you should be able to find plenty with a google search.
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Kat
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October 12, 2006, 08:05 PM

I do have the service manual and a few people who might be willing to supervise. I'm first going to run some cleaner through the bike (I got a good recommendation for something called "BG44K") and I'll fiddle with the petcock (someone said their friend's '95 Katana had petcock problems with similar symptoms including the downhill issues). Then I'll dive into the carbs face first, and I'm gonna get greasy! This should be fun. I'll get my supervisors (my heroes!) to hold the camera for me...


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Thumbs up October 13, 2006, 07:11 AM

BigB sez: Get your carbs synchronized.
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October 13, 2006, 07:48 AM

Carb sync is never a bad idea but it's probably not going to make a difference with your idle/angle issue. To me, it sounds like your choke is sticking. My Bandit would stall on choke when I was braking to stop. My float levels were within spec. Once the bike was warmed and off choke, it was peachy.


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