Gear 6 won't go faster then 70 - 600RR.net
Exhaust & Fuel Delivery Tips on how to get the most out of your bike

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post #1 of 38 (permalink) Old 01-23-2015, 12:53 PM Thread Starter
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Gear 6 won't go faster then 70

The bike rides find on all gears lower then 6th gear. On 5th I can hall-$&@ to 70-80 mph. On 6th gear the bike won't go be on 70 and sounds like the bike is redline but rpm is only 7000-7500k. The bike did sit for three years. Did oil change new battery coolant flush brake flush fuel was drain out and new fuel add. Rode around for two hours to see how the bike preform before riding it long distances. Please help.
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post #2 of 38 (permalink) Old 01-23-2015, 03:36 PM
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Maybe it has a rev limiter on it?
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post #3 of 38 (permalink) Old 01-23-2015, 03:56 PM Thread Starter
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Maybe. I don't know. Got the bike with 700 miles. Third owner
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post #4 of 38 (permalink) Old 01-23-2015, 04:15 PM
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3rd owner 700 miles sounds fishy as **** lol
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post #5 of 38 (permalink) Old 01-23-2015, 04:23 PM
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3rd owner 700 miles sounds fishy as **** lol
^^^^^What he said.
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post #6 of 38 (permalink) Old 01-23-2015, 07:07 PM
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Sounds like a fuel starvation issue. Change the fuel filter and get the injectors cleaned
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post #7 of 38 (permalink) Old 01-24-2015, 08:26 AM
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Two possibilites come to mind:

1. IIRC 7k is when the upper injectors are supposed to kick in.

2. Restrictor plates?

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post #8 of 38 (permalink) Old 01-24-2015, 08:31 AM Thread Starter
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My brother bought the bike back in 08 from a used dealer in NC. My brother stored the bike til I came to pick not up. It does sound like fuel issues. But would the engine sound like that, redlining at 7000 rpm.
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post #9 of 38 (permalink) Old 01-24-2015, 08:33 AM Thread Starter
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The has been ran at the track before. So I don't think it's got a rev limiter or a restricted plate.
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post #10 of 38 (permalink) Old 01-24-2015, 08:49 AM
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If you were riding it when this was discovered, were able to glance at the temp gauge and if so was it above normal?

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post #11 of 38 (permalink) Old 01-24-2015, 03:28 PM Thread Starter
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It was at 160-174F
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post #12 of 38 (permalink) Old 01-24-2015, 04:08 PM
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Hmmm, if you don't see any FI light/no trouble codes to consider I'm leaning towards the throttle just not opening; if it was so starved for it'd probably lean out and the temps would skyrocket...or perhaps you could have serious compression loss.

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post #13 of 38 (permalink) Old 01-26-2015, 07:11 PM
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have your fuel injectors cleaned & check if the fuel pump is delivering the correct amount of volume by doing the fuel pump test.


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post #14 of 38 (permalink) Old 01-27-2015, 07:59 PM Thread Starter
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Gonna have the fuel pump and filter and gas tank change. Thanks. I'll keep u guys posted on what happens.
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post #15 of 38 (permalink) Old 01-27-2015, 08:36 PM
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Originally Posted by OveRReV View Post
have your fuel injectors cleaned & check if the fuel pump is delivering the correct amount of volume by doing the fuel pump test.
What's the fuel pump test?

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post #16 of 38 (permalink) Old 01-28-2015, 01:19 AM
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Quote:
Originally Posted by cbrkat28 View Post
What's the fuel pump test?
it's when you turn on the fuel pump for 10 seconds & measure the volume of fuel it pumped out, in this case it's 167cc for 10 seconds at 12V, better have a beaker, fully charged battery, wires & hoses to do this test. when my pump was clogged it could only flow 150cc at best, after cleaning the strainer & fuel filter it pumped 200cc in 5 seconds.


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HRC ECU AMA spec
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WP 4618 rear shock
WP 1508 steering damper
Ohlins 9.0N fork springs
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BMC race air filter
AFAM 15/47 sprockets
DID VX2 520 gold chain
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HEL brakelines
Euro Racing riser plates & lever
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EVR CTS slipper clutch
BST CF wheels
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post #17 of 38 (permalink) Old 01-28-2015, 01:47 AM
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Quote:
Originally Posted by OveRReV View Post
it's when you turn on the fuel pump for 10 seconds & measure the volume of fuel it pumped out, in this case it's 167cc for 10 seconds at 12V, better have a beaker, fully charged battery, wires & hoses to do this test. when my pump was clogged it could only flow 150cc at best, after cleaning the strainer & fuel filter it pumped 200cc in 5 seconds.
That's a significant difference...but I'd add a fire extinguisher nearby and some type of ventilation to that list.

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post #18 of 38 (permalink) Old 01-28-2015, 02:30 PM Thread Starter
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I'll have to test it. Maybe with a colt meter.
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post #19 of 38 (permalink) Old 01-29-2015, 01:19 PM
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I don't see how a fuel pump could affect only the 6th gear. Mugen, how high can you rev it in the first gear? If it was fuel delivery issue you wouldn't be able to rev it past what you already found in any gear.

Doubt it's the injectors either. Reading through the trouble codes posted in this forum the engine shouldn't start with an injector fault, if I'm reading it right. At this point, the fuel pump sounds like a more reasonable culprit.

Edit: The hell is a colt meter?

Last edited by Lyoha; 01-29-2015 at 01:22 PM.
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post #20 of 38 (permalink) Old 01-29-2015, 02:07 PM
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I don't see how a fuel pump could affect only the 6th gear. Mugen, how high can you rev it in the first gear? If it was fuel delivery issue you wouldn't be able to rev it past what you already found in any gear.

Doubt it's the injectors either. Reading through the trouble codes posted in this forum the engine shouldn't start with an injector fault, if I'm reading it right. At this point, the fuel pump sounds like a more reasonable culprit.

Edit: The hell is a colt meter?
Probably meant volt meter...v and c are next to each other on keyboards and spell check wouldn't pick that up

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post #21 of 38 (permalink) Old 01-29-2015, 09:06 PM Thread Starter
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i can rev 1st to 15k rpm. dont know bro. new gas tank fuel filter fuel pump. its not only happening in 6th gear it happens in all gears now. it only happens after the bike has been driven for a bit. for example i can be on 5 gear at 60-70 mph and when i try to gun it it kicks in and then i lose power and it wants to try to go but at the same time it loses power.took it to dealer and they didnt find anything. replaced all those parts and no lucky.

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post #22 of 38 (permalink) Old 01-29-2015, 11:01 PM
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Have you checked Spark plug?
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post #23 of 38 (permalink) Old 01-29-2015, 11:08 PM
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Quote:
Originally Posted by Lyoha View Post
I don't see how a fuel pump could affect only the 6th gear. Mugen, how high can you rev it in the first gear? If it was fuel delivery issue you wouldn't be able to rev it past what you already found in any gear.

Doubt it's the injectors either. Reading through the trouble codes posted in this forum the engine shouldn't start with an injector fault, if I'm reading it right. At this point, the fuel pump sounds like a more reasonable culprit.

Edit: The hell is a colt meter?

i'm going to have to disagree here.

low fuel pump output will only manifest when the engine is loaded. the more load on the engine the more fuel it needs, so in lower gears (less load), you often won't find an issue, but when in the top gears fuel starvation is much more evident.
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post #24 of 38 (permalink) Old 01-30-2015, 10:35 AM
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Hmm, I thought fuel delivery was based on RPM, gear, and throttle position. At least that's what it looks like from the maps. Load on the engine, then, is a result of RPM and throttle application. Gears merely transfer that load through the rear tire onto the road. The ECU will signal the injectors to deliver set amounts of fuel per RPM and throttle position in each gear. And although the maps are different for each gear, the quantities can't be substantially off. That's why I figured if you can run in the lower gears at moderate throttle all the way up to the redline, the fuel pump must be doing its job. As an example, fuel delivered at 50% throttle at 5000RPM probably will be pretty close to the delivery with 25% throttle at 10000RPM. Don't take these number as anything empirical, I'm just throwing it out there as a theoretical case.

So as another attempt, Mugen, try running the bike again in top gear but at very light throttle and see if it still tops out at the RPM range you listed. Alternatively, you can try giving it some serious amount of throttle, say in third, from lower RPMs and see if the bike bogs at any point. If for nothing else, to feed my own curiosity.
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post #25 of 38 (permalink) Old 01-30-2015, 05:22 PM Thread Starter
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Rpm well go further but the engines gives out on power like it wants to choke out. But bike will not choke out if it comes to idle. I sometimes turn it off and restart it mins later and it runs fine again. But it will do it again moments later. No clue. I called afew dealers to see if they knew but they ain't for sure either. Gonna have to take it in again.
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post #26 of 38 (permalink) Old 01-30-2015, 07:57 PM
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could be the ECU that's at fault, try another ECU just to confirm.


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Electrex World race alternator
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WP 1508 steering damper
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post #27 of 38 (permalink) Old 01-30-2015, 08:51 PM
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Maybe you had the tank up? when you return tank to mounts its very easy to pinch breather/vent/delivery hoses.

could you have a restricted breather /tank/delivery that is only allowing a certain amount of fuel to be delivered? (or air to enter the tank?)

Next time it happens , ASAP (safely!) open gas cap and listen for a vacuum in the tank.
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post #28 of 38 (permalink) Old 01-30-2015, 09:04 PM
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Quote:
Originally Posted by Lyoha View Post
Hmm, I thought fuel delivery was based on RPM, gear, and throttle position. At least that's what it looks like from the maps. Load on the engine, then, is a result of RPM and throttle application. Gears merely transfer that load through the rear tire onto the road. The ECU will signal the injectors to deliver set amounts of fuel per RPM and throttle position in each gear. And although the maps are different for each gear, the quantities can't be substantially off. That's why I figured if you can run in the lower gears at moderate throttle all the way up to the redline, the fuel pump must be doing its job. As an example, fuel delivered at 50% throttle at 5000RPM probably will be pretty close to the delivery with 25% throttle at 10000RPM. Don't take these number as anything empirical, I'm just throwing it out there as a theoretical case.

So as another attempt, Mugen, try running the bike again in top gear but at very light throttle and see if it still tops out at the RPM range you listed. Alternatively, you can try giving it some serious amount of throttle, say in third, from lower RPMs and see if the bike bogs at any point. If for nothing else, to feed my own curiosity.
What matters most is throttle position, that is going to dictate how much air the motor is using and the ecu will fuel for an Afr. How much fuel is obviously decided by the map.

You can easily rev to redline in the first few gears at partial throttle, because the load on the engine is lower (less HP required), in taller gears this isn't true. I recently fixed a 600rr with a low flowing fuel pump, the owner said it was sluggish in taller gears, where throttle positions are more open and more fuel needs to be delivered.
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post #29 of 38 (permalink) Old 02-01-2015, 01:50 PM
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I think mine is close to needing this done.

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post #30 of 38 (permalink) Old 02-01-2015, 05:03 PM Thread Starter
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So here's an up date. Bike is working and running fine. I guess after the new gas tank fuel filter fuel pump and new throttle cables changed. Spark plugs were a bit foul but cleaned them and reused. Just wanted to thank you guy for advices and ideas. Much appreciated.
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