flyboy
Pro
Posts: 1536
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posted September 06, 2008 10:01 PM
 Edited By: flyboy on 6 Sep 2008 23:30
Need Help. Motor problems---
Just got back from Bonnevillle--
On 7 vitial runs engine would reach approx. 10500 RPM in 6th gear and then suddenly start to die slowly down to approx. 8,000 rpm and then just suddenly pick up full power again. Changed fuel, checked map and HUB but couldn't find the problem. It sounded and appeared to be electrical as the motor would just wind down after 10 to 20 seconds at over 10,000 rpm. There was no sputtering or coughing. It sounded electrical. Speed restriction was bipassed and rev limiter was never reached. Even happened while applying NOS. A/F mixtures was in limits. This didn't happen on all runs however.
On two other runs the motor would just temporarily just "hicccup" at 5,500 rpm. The only thing I can think of was salt on an electrial connection to temporarily short "something"? Thought it might be a dirty injector but added an injectore cleaning fluid to the fuel. IT didn't solve the problem. I was running MR 9 and MR 11.
I would appreciate any help or suggestions-- very frustrated. 
Thanks--
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'There's more living in five minutes flat-out on a bike than some men have in an entire life'.
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One fast red ZX-14,
Three World and four National Land Speed Records,
One faster red and white Cessna Turbo 210
   
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smokinzx14
Needs a life
Posts: 10197
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posted September 07, 2008 06:12 AM
Since i can't hear it , see it or feel it myself my guess would be fuel pump ...
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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jdzx14
Expert Class
Posts: 412
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posted September 07, 2008 06:15 AM
I second that, sounds like running out of fuel, but its odd it does it in 6th gear though, i would say to hook a fuel pressure gauge up and try to read it at high rpm's and see if they drop suddenly, but that could be kinda difficult on a motorcycle.
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2007 Black ZX-14
Lowering links, Brocks Strap Kit, Muzzy Full 4-2-1, No files, PC3, BMC Race filter, 6 inch extensions,16/44, Shinko 003 Ultra Soft..... SOLD!!!!!
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smokinzx14
Needs a life
Posts: 10197
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posted September 07, 2008 06:55 AM
6th gear puts the most load in a fuel system ... It's in 6th gear for much longer than any other gear and fuel demand goes to the roof .. If you had a weak pump it would show up in 6th before any other gear .. But 6th gear would also put the same loads on the charging system and a weak Ign system would also show up better in 6th gear over any other gear ..
Lets say the voltage drop at 10500 RPMs was 1 or 2 volts the pump pressure would drop even if the pump was in good working order .. Lets say the pump is weak and the voltage drops also ... So you need to look at both voltage and pump pressure ...You should be able to test both on a dyno in 6th gear with the proper gauges hooked up ...
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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serius blk
Zone Head
Posts: 543
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posted September 07, 2008 07:24 AM
try changing the gas and see if it happens again. I used some mr9 and after a few runs the bike would develop a studder when i open the throttle at a low rpm in 5th or 6th gear. I dont notice it with the regular 89 octane. Also after setting the speedohealer to bypass top end limiter i still found myself hitting it. I had to set it well below what it should have been for my gearing to make it work. It still may be limiting at a point.
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shane661
Needs a life
Posts: 11494
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posted September 07, 2008 07:38 AM
Edited By: shane661 on 7 Sep 2008 08:39
I wonder if the fuel pump might be damaged from running the MR9? Have you used a lot of MR9, or let it sit extended? I know someone who ate up a fuel pump on their 12R, presumably due to the MR9.
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bigdtd
Needs a job
Interceptors
Posts: 4209
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posted September 07, 2008 07:49 AM
after looking at smokin's other post, change the spark plugs
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2006 Black ZX-14,6 inches over,16/42, flies out,BMC Street Filter,Brock's Street Meg,Brock's Radial Mount Strap,PClll with Race map,Dynojet LCD w/Techmount, ZX-14 fender eliminator,Pilot Power2CTs,Speedohealer,Pazzo Levers,Cox Radiator Guard, Garmin Nuvi 265WT
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted September 07, 2008 01:09 PM
William, were you running a wet shot, or just motor?
The voltage regulator is known to overheat and makes the bike run like its loosing fuel, as already stated.
If your running an additional fuel pump on the wet shot, I would guess the charging system is taxed...
If you run really high oil level, you could be pumping excess oil into the airbox, which is like fogging the cylinders with oil.
once the rpm drop it will begin to clear out and run better.
You'll know it has been happening if the airbox is oil soaked back by the map sensor, on the frame cover. You will have to pull the cover to check it properly.
I doubt your running an airfilter on the flats, so you can't check that.
Do you run your engine oil at least 75% up the sight glass for extended high rpm runs?
This is very important, as the oil doesn't return as fast as its pumped away when oil levels are even at mid sight glass, over long redlined runs.
I fill mine as close to the top as possible without being over the glass.
Too much oil will get pumped out the crankcase vent as stated above.
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destiny will overcome intervention.
Some are not worthy of the effort.
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nczx14
Expert Class
Posts: 108
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posted September 07, 2008 05:22 PM
Put you a cooling fan on the Voltage Regulator.
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2K7 everything possible without going in the engine.
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billeason
Zone Head
Posts: 711
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posted September 07, 2008 05:37 PM
Unhook the p/c and try it on motor, you said you tested p/c and hub,but did you disconnect the p/c and make a pass? I 'm running into a couple bikes, busa's and 14's for some reason with the hub/p/c combo get a low to mid rpm hiccup and a dead spot at the top. I have not figured out what's going on yet,but it's becoming a problem. I also feel the reg may be a problem on the juice''but didn't you say it was on motor also. Unless you have a lot of other electrical draw on your bike,the reg shouldn't be overheating on motor.......
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bill eason
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ninja12
Needs a job
Posts: 3310
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posted September 07, 2008 07:29 PM
pinched fuel line, maybe.
done any work under the tank lately?
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