Question about 2002 Yamaha YZF-R7 OWO2

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Fuel not going through carbs all jets and pipes are clear !? this is a yamaha 700cc two stroke superjet on a 2002 kind regards harry

Posted by harry_macmor on


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1. check if gaz flows from tank with the hose off.
if not then vacum operated on/off/reserve valve defective or not getting vaccum

ps check with gaz filler cap off, the vent may be blocked. the tank needs to pull in air to replace fuel volume, so it can flow

Posted on Jul 19, 2009


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It Runs but has very little power,quits often,if you give it to much throttle it bogs down

Robert, First try new plugs, check fuel filter, sounds like it could be carburetor/injector issue, dirt,plugged jet, etc. Remove and clean/rebuild carb./injector.
Check the attached links,instruction and guides, Good luck
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May 23, 2016 | Yamaha 2004 WaveRunner Superjet Base

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I can't get spark from my 2006 yz 125, i changed the spark plug and the coil. I also unplugged the kill switch to make sure that wasn't faulty. what else could cause me to not get spark? I also...

There are a lot of tiny fuel and air passageways in the carburetor that must be kept clean it order for your scooter to run right. Carefully, take the carburetor apart. This can be relative easy. The carb has tiny passages that can get gummed up. Your bike will not run correctly if the carburetor isn't completely clean, so take your time. I use a gallon container of carb dip (you can get a gallon at your local auto supply store).
First, remove all of the rubber and gaskets or they will get damaged. After a 20 minute soaking in carb dip, I blow out the carb with compressed air. You have to get all the jets and the passageways clean. Be sure the jets are clear, especially the starter jet. Sometimes carb cleaner won't clear out these tiny jets. Use a guitar or a piano string, a strand of copper electrical wire, or a tiny drill bit pin vise. Be sure not to increase the size of the hole in the starter jet or you'll change the tuning. Carefully reassemble everything, checking for cracks in the rubber carb boots and the gaskets. Replace them if they are old and cracked. Be sure and remove all rubber and gasket material first or they could get ruined. Spray carb cleaner also works if you're diligent.
If you have an electric choke, check it to make sure it works. Check the resistance between the wires - you should see around 10 ohms or less. Measure the length of the choke assembly. Remove the choke from the carb and plug the wires into a 12V source for 15 minutes. The choke body should be warm. Measure the length again - it should increase by around 1/8".
Next, consider whether your exhaust pipe is clogged. This is especially a problem with older two stroke scooters. The unburned fuel/oil mixture builds up in the exhaust pipe along with carbon over time. If the exhaust pipe is clogged, your scooter will run terribly or not at all. It can be difficult to tell if the exhaust pipe is clogged. The easiest way to tell is to remove it and try starting your scooter. It will be a bit loud - two strokes will sound like a chain saw. If it runs with the exhaust pipe off, you know that is the problem.
put a meter on the kill switch to see if you get voltage across it and check the magneto i would think that the contacts have gone rusty clean them with some fine sandpaper
also if the bike has been standing for a long time(six months or more) then replace the fuel because when its old it loses some flamabilty

hope this helps


Aug 25, 2011 | Yamaha Fuego 50 2T Motorcycles

1 Answer

03 beartraker engine pipe getting cherry red and backfiring it also is only running only at full or partial choke

You need to disassemble and clean your carburetor. Make sure the jets and carb body passageways are clean and clear. Unburned fuel from running the cycle on choke is burning in your exhaust pipe.

Oct 29, 2010 | 2002 Yamaha TT-R 250

1 Answer

My 2002 1100 v star classic does not run on the front cylinder, has spark, has compression, front cylinder stays cold. Back cylinder runs on spark, fuel, compression, no problem. Give any throttle and bike...

How good did you clean the carbs? The idle jets usually have small holes along the side, and if they are blocked with dirt or bad fuel, it won't idle. Make sure ALL of the passages are clear, and all jets are clear, through the center and holes in the sides of the pilot jets.

Aug 03, 2010 | 2002 Yamaha V Star Classic

1 Answer

Hi I have A 2006 yamaha midnight star 1700 with 4600K it came from dealer with kn air vance and kines straight pipes and has been jetted for this by dealer. It was surviced in oct then parked till two...

When carburetors sit dry, the jets and the needles that go through them oxidize. The oxide makes the surface grow, making the needles have a larger diameter, and the jets a smaller hole.

Replacing the jets and the main metering needles usually restores the performance.

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1 Answer

1985 yamaha virago 700cc trouble keeping it running,battery ok,new gas,low on oil,could that be it

as long as oil is not below the minimum mark your bike will run safetly .check plugs and fuel is getting into and gfrom carbs,possible blocked jets .

Mar 18, 2010 | 1985 Yamaha XJ 700 X Maxim

1 Answer

Wont stay running with out the choke on

it sounds like you need a carb clean performed. the idle cuciut jet is probably dirty and that is the jet that supplies gas to the combustion process at idle rpm's. when you have the choke pulled out it is adding fuel and air so when you shut off the choke the fuel supply goes away. for the oils use yamalube 2 stroke oil for pre-mix and 10w -30 gear oil for your tranny.

Dec 17, 2008 | 2003 Yamaha YZ 125

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