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I have a YZ 450f 2004 when I bought it I think the bike was tuned with a Racing aftermarket exhaust but when I bought the bike it had a stock exhaust. Now it flutters and surges at Top end how do I fix this ?

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  • Motorcycles Master
  • 3,799 Answers

Buy a manual and reset the engine to manufacturer spec. All the info you need to do this is in the manual, They also contain all the info you need to service and diagnose any faults. It will cost about 20GBP but will save you hundreds in labour costs and incorrect assembly causing multiple replacements. It will also give you all the correct parts, pressures and torque settings to keep you bike running properly.

Posted on May 05, 2013

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Magaiver
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SOURCE: Fuel/air mixture screw. How many turns should the

3.5 turns out should fix it. Hope this helps.

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SOURCE: what to look for when buying a gsxr 600

stva controls secondary butterflys, nothing really major to worry about, until it dies. It has some bad solder points on it which work loose, and have to be re soldered. It is covered un a warrenty for up to 5 years, and 18,xxx miles or something i bellieve. Other wise no real major problems, just the normal wear and tear, and way previous owners have treated the bike

Posted on Nov 10, 2008

  • 3567 Answers

SOURCE: while riding my yz 125 it just died and won,t kick up again

  • If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
  • If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
  • While at the parts counter, get a new stock spark plug and a supply of Yamalube Two Stroke Motor Oil. You need to add 4 ounces per gallon when filling up. This will be a 32/1 gas to oil ratio. NEVER ride the bike without at least the needed 32/1 mix.
Please rate the solution as a "FixYa" if able. Thanks!

Posted on Mar 23, 2009

  • 86 Answers

SOURCE: how much is my yz 125 worth?

the retail value in good condition is approx $1,500. meaning it looks good, runs good, good tires, breaks,chain and sprokets. but with the extras you have and the after market up grades, i would start with a little higher price.

Posted on May 21, 2009

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SOURCE: 81 xj650lh midnight maxim black exhaust, sooty plugs keep fouling

hi,fairly common problem with modified exhaust,start with the pilot screws,turn right in untill the screws are firm then back out 1 and 3/4 turns,this is a fairly standard rule of thumb that will get most things going,as far as the jets go,the original size would be a good starting point,but you should only need to go up 10-15 sizes to compensate for the exhaust mods(ie stock might be 127 may need to go to138 or 140 etc),the other thing that i would recommend is getting hold of a set of damped carb balancers these will enable you to get the mixtures and carb balance dead right,they are relitively cheap and easy to use and will have paid for themselves the first time you use them.(i regularly get 4-8 sometimes 10-11 extra hp over stock by tuning the carbs up properly).hope this helps

Posted on Jul 06, 2009

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1 Answer

Can you remove the clutch push lever on 09 yz450f without splitting the case? If so how?


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

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Higher octane fuel is needed from what you describe. Without knowing where you are located and how hard you ride the bike, it's impossible for anyone to offer any jetting advice. Higher octane fuel will likely help, but if you (or a previous owner perhaps) have shaved the head for higher compression, you might have to run higher octane racing fuel.

Also - check to make sure the pipe is sealed well at the head pipe connection - if not, it will **** air at high RPM and can cook your piston.

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