Question about Motorcycles

Open Question

I have a 1980 Yamahopper. The throttle seems to work fine but the engine revs up on its own after a while. What might this be?

Posted by Anonymous on

Ad

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 134 Answers

SOURCE: its a 1980 yz465,runs great

You may have an intake leak between the carb and head. Make sure the carburetor is fully seated in the intake boot and that the intake boot has no cracks in it. If the carburetor is a flange type, make sure that the gasket or "O" ring, (whichever is used), is in good shape. You can test for a vacuum leak by spraying WD-40 around the carburetor mount. If the engine changes speed, you have a leak. Running the engine with an intake leak can cause serious engine damage.

Posted on Oct 30, 2010

Ad
  • 3567 Answers

SOURCE: 1980 suzuki gs850 ... sometimes

Check the compression on each cylinder. Chances are good the bike needs a valve job.

Posted on Mar 15, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

350 V8..revs itself and idles at higher rpm..tap excelerator and goes down to normal


if it is a carby engine then check the settings of the automatcic choke and the throttle cam screw settings
it works in a manner so that when you press on the accelerator the automatic choke flips a cam around and the idle speed screw rests on that cam giving a high idle speed until the engine is hot enough not to need a choke at which point the cam is held clear of the idle screw
if efi engine run the fault codes to check for problem accelerator position sensor or throttle position sensor.

Sep 04, 2015 | 1980 Chevrolet Corvette

2 Answers

On a 1997 ford festiva the engine starts chugging through rev range and poor performance


Very much sounds like a fuel filter blockage, or it could be a faulty fuel pump, try a filter first, hope this helps

Aug 28, 2014 | Ford Festiva Cars & Trucks

1 Answer

1993 festiva replaced the throttle body gasket now will not accelerate at temp


I have a 1997 ford E 150 customize mark 3 van have driven back and forth to work 5 years ran great Christmas Day drove down to the garage and back up to house and now it will not start turns over has spark will not fire

Jan 07, 2014 | 1993 Ford Festiva

1 Answer

WHAT TYPE OF OIL FOR A YAMAHOPPER GT50 1983


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Yamaha QT50 Engine and Transmission Oil
Changing Transmission Oil In The Yamaha QT50K Moped
Yamaha QT50G2 Owner Manual
OEM parts for Yamaha
Yamaha QT 50F Service Manual

Aug 29, 2013 | Yamaha Motorcycles

1 Answer

Engine revs out of control


check the inlet rubbers between the carbs and engine for cracks or hardening as an air leak here could be the source of your problems...

Oct 13, 2012 | 1980 Suzuki Gs 550 L

1 Answer

Engine starts and idles fine, but will not rev up (2001 Jeep Grand Cherokee 3.1 diesel auto)


If it was a fuel shortage the engine would rev but to limited speed. This is a lack of air to throttle body. Check for clogged air filter and all the piping and the throttle body.

Sep 28, 2012 | 2001 Jeep Grand Cherokee

1 Answer

Its a 1980 yz465,runs great but it seems after it gets warmed up the throttle seems to get hung up.but the throttle twist itself is closed but it revs up and idles very high. Also it can be pullstarted...


You may have an intake leak between the carb and head. Make sure the carburetor is fully seated in the intake boot and that the intake boot has no cracks in it. If the carburetor is a flange type, make sure that the gasket or "O" ring, (whichever is used), is in good shape. You can test for a vacuum leak by spraying WD-40 around the carburetor mount. If the engine changes speed, you have a leak. Running the engine with an intake leak can cause serious engine damage.

Oct 30, 2010 | Yamaha YZ 450 F Motorcycles

1 Answer

MY 1999 1.8L PASSAT HAVING THROTTLE PROBLEMS REVS UP DIES DOWN REVS UP DIES DOWN THE MECHANIC SAID IT WAS THE THROTTLE BODY THEY CLEARED THE CODES INSTALLED THE THROTTLE BODY AND WORKED FINE UNTIL I TURNED...


it can still cause trouble, im a former vw tech, and you would be amazed at how long they last or issues that arrise, I watched a tech install an engine once because he refused to belive radio was failed,

Jun 09, 2010 | 1999 Volkswagen Passat

1 Answer

1980 Yamaha XS 650 special not charging


check the rotor magnet to see if the windings are shorted to the base use an ohm meter to check for grounding to the base.

Apr 04, 2010 | 1980 Yamaha XS 650 G

1 Answer

Engine revs wide open when starting


Check to see if the throttle shaft on the carburetor is actually moving (with engine off) Does it slow down when you move the throttle control on the dash?
Start it up and try moving the linkage on the governor shaft, if there is little or no resistance but the engine slows when you move it, most likely you have a broken governor gear inside the engine. Another possibility is that the screws that hold the throttle plate to the shaft have come loose and the plate is jammed in the throat of the carburetor

Sep 14, 2009 | Garden

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

53 people viewed this question

Ask a Question

Usually answered in minutes!

Top Motorcycles Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4533 Answers

yadayada
yadayada

Level 3 Expert

76630 Answers

kakima

Level 3 Expert

102366 Answers

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

Answer questions

Manuals & User Guides

Loading...