Question about 2001 Yamaha YZF-R1

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My 2001 yamaha yzf r1 dont want to go past 235 km/h and between 7 and 10 000rpm it sounds and feels like its starving. Running to lean. Can it be that my bike is restricted and oh yes is carb fed

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  • ddstrydom Apr 14, 2011

    Ive changed the main jets on the bike with bigger jets but still the same problem.its doing that in every gear. Im fed up with this yamaha.

  • ddstrydom Jul 12, 2011

    Hey what's up man its me again. Got another problem here. Can u tell me if a wrong tps angle has got an influence on top end speed cause I've checked mine and when disconnected the rev needle goes up to 3000rpm and I think its suppose to show 5000rpm tnx in advance..

  • ddstrydom Dec 07, 2011

    Hey how r u mate. Can u please tell me. Is it possible that an exhaust can have an effect on topspeed performance.

  • ddstrydom Dec 07, 2011

    Hey how r u mate. Can u please tell me. Is it possible that an exhaust can have an effect on topspeed performance.

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  • 747 Answers

That's one crazy fast speed, I'm going to assume you are on a race track not the streets or high ways. To answer the restricted part "normally" what happens here is the engine goes into a state of controlled miss fire "limiting" the engine revs to a specific RPM called a rev limiter.

Okay the part that is the problem is the carb jetting, you are basically running out of gas at high speed when the engine is under sever power demands. Causes can be many one is because it's a carburetor type engine it is sensitive to atmospheric changes as in altitude, temperature and humidity. This is were an injected engine will shine because it automatically adjust for these conditions almost instantly.

Another problem is if the bike has performed properly before under the same conditions then I'd say you just brought it out of storage and the gas was left to evaporate in the system and has left sediment behind partially clogging the high speed jet(s)

Normally carburetor type motorcycles are a gravity feed (when the gas tank rested above the engine) id the fuel filter in the tank and the one in-line before the carb(s) are partially blocked it will also give the problem.

My suggestion would be to have a motorcycle mechanic do a fuels system service to correct the lean condition.

Posted on Apr 05, 2011

  • 9 more comments 
  • ddstrydom Apr 13, 2011

    Hey i did a fuel system check but still the same problem. You know alot of the R1 owners keep on telling me what a nice bike it is but mine is powerless. Can you adjust the carb to take more fuel or should i get it jetted

  • Robert Taylor
    Robert Taylor Apr 13, 2011

    This motorcycle has mass amounts of high tech and if you are confident the person who checked the fuels system knows what they are doing then we will put that aside for a moment. Has the bike just come out of storage? More things to check one being the battery check the voltage after it's been sitting overnight should be 12 volts + more like 12.5 v if it's 11 volts the battery is no good.
    Spark plugs can give a high speed flutter if they are braking down, that's a hard one to find unless you are using a "peak voltage meter" quickest way is just to replace them all and do it with the factory recommended type, make and heat range.

    If your problem is consistent and the above suggestions haven't helped it might be time to check the valve timing, setting and check if there is a broken valve spring on one or more of the valves. A broken valve spring will definitely give a flutter because it bounces. "Normally" a broken valve spring will drop the valve into the engine and grenade but, some multi valve heads have a valve spring inside a valve spring the inner one being much lighter but holds the valve keepers thus stopping the valve from dropping. I'm not saying that Yamamha has used this system I'm just saying that a floating valve will give you a flutter as well.

    Now if this bike was working great last year and isn't this year I'd still go back to the carb(s) having a partial jet blockage. A possible fix is to get a product called "Sea Foam" darn stuff works great for cleaning out fuel systems, mix it properly as directed and run the bike maybe a could tank of gas. If there is no improvement then go for the battery, plugs then the valve AND also see if a Yamaha shop can check out the ignition module.
    Best of luck hopefully it's just a set of bad plugs

  • Robert Taylor
    Robert Taylor Apr 14, 2011

    So did you change the plugs or anything else I suggested? What's so different from this year to last? Did you move to a higher altitude? Yes I'd be pretty fed up with it as well. I was active in the marine and RV trade for over 35 years and figures these ignorant fixes were just sent to annoy us, It's time you went to a dealer for some professional help, someone that can check out the electronics on the motorcycle.

  • ddstrydom Apr 14, 2011

    No im waiting for a set of spark plugs cause the dealers didnt have any in stock. I think this bike could do with some gasoline and some matches.

  • Robert Taylor
    Robert Taylor Apr 14, 2011

    Dude, been there didn't have the stones to toss the match. So by changing the jets the problem got worse eh? It's looking like spark plugs to me. I had a 750 Honda Four one of the originals (yeah been around a while) and it would just quit running on a specific type of road surface. Turned out to be a loose ground to the ignition and the road vibration was what it needed to break connection. Yeah 5 Gallons and a match, I feel your pain. Stick with it, some simple fix will look you right in the face and you'll wonder why you didn't see it before.

    Cheers, add a comment I'd be interested to know if the plugs were a help, or solve cause the next thing I'm going to say is strap the thing on a Dyno tuner and get it under load.

  • Robert Taylor
    Robert Taylor Apr 14, 2011

    I just wrote out a reply and FixYa ate it.

    Dude, been there with 5 gallons and a match, don't do it believe me it isn't worth the after hassles, once the plugs come in you'll be fine. Change the jets back to what they were and call it done.

    If the plugs don't fix it then find a dealer or an independent shop with a Dyno tuner so they can put it under load. It's a lot cheaper to fix it then buy another.

  • ddstrydom Apr 14, 2011

    What kind of plugs do you suggest i fit in my bike. Please i need help

  • ddstrydom Apr 14, 2011

    What kind of plugs do you suggest i fit in my bike. Please i need help

  • Robert Taylor
    Robert Taylor Apr 15, 2011

    Just by what you are saying it seams like the spark plugs are breaking down under load. The type would be what it calls fore in the manual, the dealer will know which ones to install.

    Also the spark plugs can tell a story of the engine condition, good running plugs with a carb type engine will be a light tanish brown to coffee colour but not black. I don't know where you are in this world but another thing that will cause just pure grief is the octane in the gas. Regular in my country is 87 and that's the lowest my bike can run on. Some older performance bikes need more octane. If they don't get the octane it will pre-ignite, give a pinging noise and again the flutter, so there is something else to look for. Read the plugs they will tell a bigger story.

  • ddstrydom Apr 15, 2011

    I did fit a new set of spark plugs and man she's a lot better. Tanx for your help. Youre the man.

  • superbike116 Jul 18, 2011

    Hey how r u. Can a wrong floatlevel cause my bike to starve.

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