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: Lousy gas mileage  ( 2199 )
tginok9
Jr. Member
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1992 KZ1000P


Lousy gas mileage
« : July 23, 2014, 07:45:03 AM »

I just recently bought a 92 KZ1000P.  It had a leak in the petcock and I replaced that, and I thought this was why I was getting 9 mpg.  Guy I bought it from put on K&N pods and a Kerker 4-1 pipe.  Though he did break down the carbs professionally and have them done, he didn't have them rejet them with stage 3 jets, on "agressive" jets as he put it.  So I figured this was an issue too, and I took off the pods,(it ran like crap, backfired thru the carbs and exhaust constantly), and put the airbox back on.  Still have occasional exhaust backfire.  However, now  I am still only getting 15 mpg, and that's mostly highway.  I do smell gas, but can't find out where from.  There is also a small oil leak from the bottom of the generator cap and some faint white smoke from the exhaust when in low gear.  Any help on all of these issues would be greatly appreciated.  Thanks
« : August 15, 2014, 02:30:45 PM Motor Doctor »
Motor Doctor
Dan the Motor Man
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Re: Lousy gas mileage
« #1 : July 23, 2014, 03:42:00 PM »

Do you happen to know what size main jets are in it? Also did the jet needles get shimmed? Does it have a DynoJet kit in it? Stage one?
« : August 15, 2014, 02:31:02 PM Motor Doctor »
tginok9
Jr. Member
**
: 10


1992 KZ1000P


Re: Lousy gas mileage
« #2 : July 23, 2014, 04:58:51 PM »

All I know is that he used new Napco stock #11-K0275 carb repair kits, which I believe are just OEM replacement jets
« : August 15, 2014, 02:31:19 PM Motor Doctor »
Motor Doctor
Dan the Motor Man
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Re: Lowsy gas mileage
« #3 : July 23, 2014, 08:21:23 PM »

The oil leak is probably from around the stator rubber plug in the engine cover. Sometimes they leak through the wires. The mileage isn't the best on those but it should be in the 30s. I would check the engine state of tune (compression/spark plugs/air filter) and see how those are. The compression should be at least 150. Check the spark plugs, in the normal heat range they should be running clean. Check the ignition advancer to make sure it's not seized up and rotates freely.
tginok9
Jr. Member
**
: 10


1992 KZ1000P


Re: Lousy gas mileage
« #4 : July 24, 2014, 07:08:55 PM »

Thanks, I am a beginner at this, but I know some people who have more knowledge than I do and can help me check the things you mentioned.
« : August 15, 2014, 02:31:32 PM Motor Doctor »
tginok9
Jr. Member
**
: 10


1992 KZ1000P


Re: Lousy gas mileage
« #5 : August 06, 2014, 06:55:12 AM »

OK, the bike is in the shop. I already replaced the pods with the original airbox. Now, the carbs were removed and although I was assured by the previous owner, that the carbs were professionally cleaned and rejetted, the mechanic showed me that the carbs were gummed, had evidence of bad gas and water corrosion or what not, and the #2 jet was not even connected. It was lying in the bowl. Geez That should explain the bad mpg and the gas smell. The leak from the Stator cover was in part due to the almost square shaped rubber seal on the stator wires going into the generator cover, was upside down. Oh, and the Stator rotor needed replacing since one of the magnets had fallen off. Luckily no damage was done, as it was still attached to the stator. So hopefully after the oil is changed, the plugs replaced, the carbs syncd and a pressure test done, the bike will be fixed and run like a champ. I will update you all.
« : August 15, 2014, 02:31:53 PM Motor Doctor »
tginok9
Jr. Member
**
: 10


1992 KZ1000P


Re: Lousy gas mileage
« #6 : August 15, 2014, 05:15:02 AM »

Ok Doc, got the bike back from the shop.  Runs like a rocket now and the gas mileage is great.  The carbs were all gunked up and jet on #2 was off in the bowl.  The leak in the stator was fixed (I hope) with a new gasket.  Now my only concern is, the 4-1 Kerker exhaust pops on deceleration.  Ideas?
Thanks
« : August 15, 2014, 02:32:34 PM Motor Doctor »
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Dan the Motor Man
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Re: Lousy gas mileage
« #7 : August 15, 2014, 02:29:09 PM »

The things that cause popping are exhaust leaks, lean idle fuel mixture, air injection vacuum leaks, reed valves in valve cover installed wrong/leaking/broken, air injection valve not working.
« : August 15, 2014, 02:32:49 PM Motor Doctor »
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