Question about Yamaha Motorcycles

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1994 yz 80 starts fine takes off hits the powerband good n hard for bout 2 seconds then boggs out n every gear. i cleand the carbs. what else can i check?

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  • Yamaha Master
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Hi, Jamesbtaylor engine "BOG" is mainly caused by a rich air and lean fuel condition but it can also be caused by a lean air and rich fuel condition this situation rarely occurs and is only caused by the misinformed weekend warrior that owns a toolbox.
The more you open your throttle the more vacuum you are creating in your carburetor venturi and your intake manifold. When you are operating at higher RPM any unmetered air that leaks into your system can become more obvious.
Unmetered air is air that is getting into your system after the fuel has been delivered. If you have unmetered air getting into your system between the butterfly/slide of the carburetor and the cylinder head this will create a lean condition.
All of the rubber components of the fuel system like vacuum hoses and intake manifold that you mount the carburetor to are made of rubber. If none of these components have been changed out they are more than likely highly degraded and probably cracked in places to allow unwanted-unmetered-contaminated air into the combustion chamber. Check all of your vacuum lines and vacuum plugs for carburetor synchronization. The vacuum plugs are in the head just after the rubber intake manifolds. The petcock has a vacuum line as well as part of the emission system.
1. Check the intake manifold for cracks.
2. Ensure the bands used to tighten the manifolds down on the intake are secure and have not bound up the manifold.
3. Make sure air box fittings are not warped and fit completely over the carburetor.
Your airbox is metering air and is the first step in a process of consuming air and fuel. The system requires the resistance of the air filter in order to get the proper vacuum to "SUCK" the fuel out of the float bowl and create the proper venturi effect.
Improper mounting and sealing of the airbox will create a small lean effect. This might seem like no big deal but you are inviting dust and debris in your engine that is doing slow damage by not having proper fitment. Fix it so you know it's not contributing to your issue. Pick the low hanging fruit first.
Do not go and start adjusting anything at this point. It ran fine before. There is something wrong with the assembly or a component. Do not adjust your floats. Get it back to where it was. The moment you start tweaking everything is the moment you lose OEM settings which are a must have for fine tuning and maximum performance.
Fine tuning your carburetor and multi carb syncing come at the very end following the proper procedure established by the Carburetor Gods.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
yz80 bogging badly need help
http://www.off-road.com/dirtbike/voice/technical-questions-ask-mx-tuner-15258.html
Yamaha YZ80 service manual repair 1994 YZ 80 Download Manuals Technical $8 cheap
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on May 29, 2017

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Posted on Jan 02, 2017

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  • 8 Answers

SOURCE: Hello, I have a YZ 80 and i was wondering why my

Look at ?

crank seal (drawing air)

ring wear

main jet (blocked jet's)

fuel starved carb

Posted on Jul 15, 2009

ollie reece
  • 1167 Answers

SOURCE: 2005 YZ 250 bike has no power in the powerband motor starts

HI MATE ON THE CARB THERE 2 SCREW ONE FOR IDLE AND ONE FOR MIXTURE THE MIXTURE SCREW WILL BE THE SMALLEST UNSCREW A 1/4 OF TURNS ALSO TRY CHANGING THE PLUG OK

Posted on Aug 25, 2009

Adrian762
  • 425 Answers

SOURCE: 1991 yz 80 won't run with choke off.

Go to http://www.carlsalter.com/motorcycle-manuals.asp , and down load a (free) manual, then go through the trouble shooting section.

Posted on Dec 30, 2009

ckoira57
  • 267 Answers

SOURCE: What was the stock carb used on a 77 yz 80?

Mikuni 28mm (VM28) was stock. Try Keihin or Del-Orto carbs.
You can easily get some on-line info on Keihin Flat slide (28mm), they seem to be the goer.
A new set of Boyesen Power Reeds and an Iridium sparkplug to replace the stock NGK B8ES. will make a lot of difference too.
If you got the dollars to spend, a new DG header and expansion chamber will really get you revving. (Give the exhaust port a clean regardless.)
Ebay provides an array of the above items cheaply.
Cheers.

Posted on May 01, 2010

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