Motorcycles - Popular Questions, Answers, Tips & Manuals


Hi, Frustrated one, 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. If the bike has been sitting for months or years you will have to completely disassemble the carburetor and submerge the parts (except rubber parts) in "Carburetor Dip" It usually comes in a gallon bucket with a wire mesh basket that can be purchased at any automotive store. If it is not the above scenario then the following explanation will apply.
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 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 fissures.
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 for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://thumpertalk.com/forums/topic/786126-pw-80-help
https://www.youtube.com/watch?v=hLfN3jiTl1I
https://www.manualslib.com/manual/581567/Yamaha-Pw80-N.html
https://www.partsfish.com/page/oem-parts-for-yamaha
YAMAHA PW80 Owner Manual

2011 Yamaha PW80 | 156 views | 1 helpful votes


it must not have one

Genuine... | 135 views | 1 helpful votes


hello
u'd need a proper manual for this in my opinion
like there are plenty of dealers and online shops that deal in those..
you can get some free at reliable-store and it;s actually really illustrative

2006 Aprilia... | 279 views | 1 helpful votes


Hi, Richard and the usual suspects are:
1. Idle speed improperly adjusted.
2. Inlet system air leak.
3. Damaged or restricted fuel tank venting system.
4. Dirty or damaged air cleaner element.
5. The accelerator pump is inoperative.
6. Vacuum piston assembly malfunction.
7. The choke valve is not seated or leaking.
8. Restricted fuel supply tract.
9. Plugged bowl vent.
10. Loose or plugged fuel and air jets or passages.
11. Improper float level.
12. Worn or damaged needle or needle jet.
13. Loose or plugged main jets or passages.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.reddit.com/r/motorcycles/comments/3195bp/why_did_i_lose_power_with_my_new_exhaust
https://www.magnumtuning.com/en/detail/revolution-pro-motorcycle-speed-rev-limiter-cdi-box/yamaha/mt-125
https://www.magnumtuning.com/en/detail/dyno-boost-motorcycle-performance-chip/yamaha/mt-125
Yamaha YZF R125 Service Manual
https://www.partsfish.com/page/oem-parts-for-yamaha
https://www.manualslib.com/manual/1152232/Yamaha-Mt-125.html

Yamaha... | 154 views | 2 helpful votes


It takes a special wrench. You may have to order it from a dealer or specialty tool dealer.

1985 Suzuki GS... | 185 views | 1 helpful votes


here's a website that has all this information about all this and manuals everything totally free there are many actually but I personally like few .. let me k now if u need help
thanks

Honda... | 224 views | 1 helpful votes


Basically, Yes! Almost all of the engine components(and most other things) are interchangeable, some of the first(oldest) models and some of the latest(newest) PW80's have some differences but as long as you stick to one that basically loks the same or around the same year as yours you should be fine, but most Engine Parts are the same! Don't forget you can take the factory installed "plug" out of the exhaust for more power if you want/need a little more!


d8464908-0716-46a8-840e-9f67427755b3-pujhmq5yz2fla13a1caeolco-4-0.jpeg

Yamaha... | 124 views | 1 helpful votes


Probably ... could ... but did it run beforehand? if it did, what have you forgottened to plug in, I wonder . ...

Suzuki... | 245 views | 1 helpful votes


Squirt fuel in carb or tb throat. If it fires fuel problem. You can bypass the relay for fuel pump or check the output terminals if relay for power. I would bypass relay first. If it starts you either have a bad relay or missing signal to relay. Check for voltage to relay and signal voltage to relay. If both present then replace the relay.

Harley Davidson... | 119 views | 1 helpful votes


Most likely cause is a broken or bad earth on the dim light (power then has to go through 3 filaments in series to get to the earth on the good light).

Aprilia... | 234 views | 1 helpful votes


here's a website that has all this inform ation about all this and manuals everything totally free there are many actually but I personally like few .. let me know if u need help
thanks

Yamaha... | 192 views | 1 helpful votes

Tip

Reset Maintenance warning light on Lexmotto Michigan 125 efi


After nobody could help me reset the maintenance light on my lexmotto michigan 125 efi. Here is how I solved it.

remove the seat and underneath u will see the relay
20190301_090635-zzgzw54hlhkjsna2oekym3l0-2-0.jpg
Just unplug the relay and keep unplugged for a minute. Plug it back in put seat back and the light is gone. a minutes work and lexmotto would not tell me this.

on Mar 01, 2019 | Motorcycles


here's a website that has all this information about all this and manuals everything totally free there are many actually but I personally like few .. let me know if u need help
thanks

Yamaha Road Star... | 179 views | 0 helpful votes


I got this free Pdf manual from an online store for free and I don't think Ive visited a mechanic or fixya for help for more than 3-4 times out of the all t he times I fixed the chipper in these 4 years

kawasaki... | 158 views | 1 helpful votes


How many wires have you got ........

Suzuki... | 192 views | 1 helpful votes


Hi, Mark should be a 6 speed for more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Kawasaki ZL750 Eliminator
KAWASAKI Eliminator Generations Timeline Specs and Pictures
1986 Kawasaki ZL500 ZL600 Service Repair Workshop Manual DOWNLOAD Download... $15
OEM Parts for Kawasaki
http://mybikemanuals.com/kawasaki

kawasaki Z 750... | 2,037 views | 1 helpful votes


Hi, Orry you can download everything you need from here for this scenario you will need your service manual that has all fastener torque specs and a wiring diagram on the back pages, parts fiche, and owners manual if you can't find the best tool you ever bought for your Kawasaki, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
How to test Ignition Coils on Motorcycles multi meter
Testing your motorcycle coil
Kawasaki ZXR400 Service Manual Supplement
OEM Parts for Kawasaki
http://mybikemanuals.com/kawasaki

1992 kawasaki... | 1,753 views | 1 helpful votes


Hi, Niko derestrict is a negative term rider's use to express their wish to improve performance on their bike or scooter. Depending on the country and motor vehicles laws some bikes and scooters are designed to conform with said laws and their performance is slightly lower than other countries. All vehicles in the world are designed to perform at 75-80% of their maximum potential, this ensures the longevity of the engine. Derestricting or improving performance is always possible on any vehicle but the tradeoff of engine longevity numbers go down, how much depends on the number and type of performance upgrades. Your local dealership or reputable independent shop are best equipped to provide you with technical data and willingness to comply with your needs.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.aliexpress.com/item/SHADOW-400-Derestrict-CDI-for-Ignitor-Ignition-ECU-MBA/608255718.html
https://www.youtube.com/watch?v=iprgkDhLXFQ
Honda VT600C Shadow VLX Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda VT600C Owner Manual

1994 Honda VT... | 41 views | 1 helpful votes

Not finding what you are looking for?
Motorcycles Logo

179,530 questions posted

Ask a Question

Usually answered in minutes!

Top Motorcycles Experts

Arnie Burke
Arnie Burke

Level 3 Expert

5809 Answers

Marvin
Marvin

Level 3 Expert

84027 Answers

1400Slugg

Level 2 Expert

260 Answers

Are you a Motorcycle Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...