Question about 1973 Yamaha RD 250

1 Answer

1973 Yamaha RD 250 - The engine RPM's are revvving out of control. Even when I turn the key to the off posistion it takes a while to shut down. The throttle cable seems to be in good working order.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 3,567 Answers

Remove the cylinder heads and de-carbon the heads and top of the pistons. Hot spots of heated carbon buildup are igniting the fuel after the key is off. Install new spark plugs > NGK B8HS. This will fix the continued running problem.

The out of control revs is an air leak problem. Un-carbureted air is making the fuel/air mixure lean. The hose clamp at the front of the carbs may be loose and/or the gaskets from the reeds to the cylinder are no longer keeping a good seal. The carb joints and reed gaskets should be replaced. The gaskets are cheap. The carb joints are expensive. Considering this, you may want to put some gasket sealer on the carb joint mating surfaces and see if they will seal up okay. If the carb joints are cracked, you pretty much have to replace them. Please rate my answer, thanks.
1973 Yamaha RD 250 - - f732566.gif

Posted on Aug 23, 2010


1 Suggested Answer

  • 2 Answers

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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

My 73 RD 250 cranks 1st kick and runs great but when key is turned to position 2 it dies just as if I had hit the kill switch.

Hi Barry:
Sounds like there is a dead short happening in the # 2 position. Trace the wire to determine what is supposed to be happening at #2..... There will probably be a grounded connector. Gotta love those old bikes.

Mar 29, 2015 | 1973 Yamaha RD 250

1 Answer

Starts 1st kick runs great. dies immediately when key turned to position 2 {lights}

Hi Barry:
There will probably be a dead short in the light circuit. Check all of the junctions.

Mar 29, 2015 | 1973 Yamaha RD 250

1 Answer

Set carbs on rd 250 e

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 $10 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.
1973 RD 250 running rich
RD250 Carb Disassembly
Yamaha RD250 RD400 1976 1979 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha

Btw, I’m available to help over the phone in case u need at

Jul 30, 2014 | 1978 Yamaha RD 250

1 Answer

What is the largest tire i can put on original stock rim for 1973 rd 250 front and back -

I dont know but the place you will have to go to purchase the tire and have installed will know for sure. So will your local Yamaha dealer. This is a very simple problem to solve.

Jul 24, 2011 | 1973 Yamaha RD 250

1 Answer

When the motor is started it revs to about 5 or 6 thousand rpms and will not come down.

check the cables have freeplay and the carb slides move freely and havent been installed incorrectly.
intake manifold leaks can also cause high reving

Jan 18, 2011 | 1973 Yamaha RD 250

1 Answer

What is the point gap on the 1972 Yamaha 250 2 cyl 2 stroke?

usually libraries sec629 hav olschool books--there r manuals online fixya that sell um--by the way nice bike

Jun 29, 2010 | 1973 Yamaha RD 250

1 Answer

I want to know if there is a way to test my

Hello you can buy a ignition tester made by motion pro to check the spark gad visually to see if you system is putting out.

Apr 05, 2010 | 1973 Yamaha RD 250

1 Answer

I'm interested in purchasing a repair manual for my 1989 rd 350 yamaha motorcycle. Is there an auto store, or any kind of store I can buy it from? Instead of buying it online. I'd really appreciate any...

first off what country are you in ???? the 1979 rd 350 was an air cooled engine, same as 250 . the 1989 engine was water cooled with yamahas ypvs exhaust valve both very differnt in design although some frame and body parts cross over.the manual for the air cooled is: isbn 0 85696 505 7 . i dont have the water cooled number but could find it you require. the rd was exported under various different names ie: rd , rz , ypvs and so on. you can contact me @ hope this helps.

Sep 03, 2009 | 1979 Yamaha RD 250

Not finding what you are looking for?
1973 Yamaha RD 250 Logo

463 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts


Level 2 Expert

314 Answers


Level 3 Expert

1216 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1165 Answers

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

Answer questions

Manuals & User Guides