Question about 1988 Honda NSR 250 MC 18 SP-R

1 Answer

Oil leaking Hey, after a ride on my nsrIit started ******* oil out the overflow of the man oil tank, what could this be. Also my bike likes to leak whole tanks of gas onto the garage floor, I turn the gas too of but must have a stuffed o ring in there, even so it shouldnt leak whole tanks through the carbs if I were to leave it on. Any ideas?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert that hasĀ over 500 points.


    An expert who has answered 200 questions.

  • Honda Expert
  • 391 Answers

Defective fuel shutoff valve. Some can be rebuilt, others must be replaced. Use same kind if replacing.
Stuck float in carburetor. Does it run good?

Posted on Apr 13, 2014


6 Suggested Answers

  • 2 Answers

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

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 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

cape cod bob
  • 292 Answers

SOURCE: gas leaking from hose that is under tank that is not for gas flow

is it an overflow from the carb? gas will only be in one of 2 tubes and they are the fuel line from the tank and the carb over flow. unless you have an electronic fuel pump then tubes go from tank to pump to carb. if its coming from the overflow then you are getting too much fuel into the carb float chamber. you may have a sticky float. thy getting some Berrymans B12 fuel additive and putting double the doseage in the tank. run engine til hot then leave it to stand overnight. this should break down any gum/varnish that has built up in the system

has this been in storage thru winter?

Posted on Apr 02, 2009

  • 688 Answers

SOURCE: Fuel leaking into crankcase on 2001 Honda CBR 600

it's probably leaking from the carb and down the cylinder into the crankcase.
it is probably due to a stuck float in the carb. take the float bowl off and make sure it is clean. the float can also be full of gas not letting it float up and stop the gas flow. the carb will fill up and leak wherever it can which is likely the case

Posted on Jul 21, 2009

  • 1564 Answers

SOURCE: no fuel to carb, I think..

I would check the vacuum line that opens the fuel feed valve. It's located right under the fuel shutoff valv and is fed by the #2 carburetor.

Posted on Aug 16, 2009

  • 376 Answers

SOURCE: I let the bike sit with gas in tank. Now, carbs

You got to take them off the bike and dismantle them completely to clean them real well.

Posted on Oct 05, 2009

Testimonial: "That's what I thought. Those spray cleaners never work."

  • 224 Answers

SOURCE: After garage storage for 1.5 years, I started her

below the tank from the carb? float needle valve assembly is stuck. you need a carb clean.

Posted on Jun 08, 2010

Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

Is it a concern an oil leak from the base rear cylinder 1995 heritage softail

You can ride it, but the leaking oil could cause problems if it gets on the rear tire, brakes, etc. You may as well replace both base gaskets at the same time.

Mar 05, 2013 | Harley Davidson FLSTC Heritage Softail...

1 Answer

I ride a 08 street glide and I have white spots all over my bike like a oil leak or something not sure where it's coming from could it be a head gasket the spots are all over my tank breather cove

Hi Al, take a ride over to your local dealers service department, I'm sure they will be happy to take your Harley Davidson for a test ride if necessary and offer professional advice and assistance concerning your issue. Have a nice day.

Jul 19, 2012 | 2008 Harley Davidson FLHX Street Glide

1 Answer

Why does my 03 yamaha yzf 600rr leak oil from the overflow and from the case on the left side of the motor,and into the airbox?

Hi, Christine your scenario is usually caused by oil tank overfilled or restricted engine breather for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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.
Oil coming from the crankcase breather The FZR Forum
YZF600R Forums View topic Possible Oil Leak
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha
Yamaha YZF600RP Owner Manual

Mar 02, 2012 | Yamaha YZF 600 R thunder cat Motorcycles

1 Answer

Why does my 03 yamaha yzf 600rr leak oil from the overflow and from the case on the left side?

Stop.. change the oil and filter and put the right amount of oil in it.. then see what happens... then you will KNOW it right...

Aug 10, 2017 | Motorcycles

2 Answers


The only oil that can leak from iside your engine is from the gearbox. There is no sump as the engine is lubricated by the oil fed in through the induction system. Clean the area thoroughly and leave it for a while(overnight) then check again. The oil could just be overfill from the 2-stroke tank. By cleaning it first you are given new evidence to identify the leak point. Hope this helps, when you have more info let me know.

Dec 08, 2011 | Yamaha YZ 250 Motorcycles

1 Answer

Fuel leaking from air box after shutting down

Thats the float valve seals not shutting off, did you clean them & set the float heights?
The overflows from the carb bottoms must also be blocked for the fuel to fill up the carbs which then leaks into the air filter
Check also that the fuel tap turns off when bike is not running

Ride Safe

May 20, 2010 | 1985 kawasaki ZL 900 A1 Eliminator

1 Answer

Why is my motorcycle leaking oil from the overflow tube? I let some oil out to be sure there wasn't too much oil, but it is still leaking. It leaks when it is off on its kick stand and it leaks when I...

You have a crankcase breather hose that may be blocked, allowing excessive oil pressure to push oil out. It should be routed to the airbox. This may also be the overflow hose you are speaking about. Your oil type may not be suited to a motorcycle engine, automotive oils are NOT suitable for bike engines for many reasons, notably shared gearbox and engine oil and a wet clutch. Check function of the oil pressure switch as this should send a signal of loss or excessive oil pressure. Check your manual for correct weight and quantity and type of oil filter needed. The oil level is indicated on the stem of the oil filler cap.

May 10, 2010 | 2004 Suzuki GS 500 F

1 Answer

I have a 2000 1200 custom sportster. It leaks oil out of a overflow tube under the seat.It leaks on the rear end when riding or on the grnd when parked. One mech replaced trans seal, still leaked. Another...

if the oil tank is above the crank case, inspect the oil pump check valve. go online and study the check valve's functional purpose and see to it that the vale is operating properly. it should not be an expensive fix.
if you reroute hose be carefull of rear tire annnd what does the oil level in the oil tank sit at when full and after the leak happens after -say a day of riding- a week  

Mar 21, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

Not finding what you are looking for?
1988 Honda NSR 250 MC 18 SP-R Logo

162 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4535 Answers


Level 3 Expert

76630 Answers


Level 2 Expert

342 Answers

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

Answer questions

Manuals & User Guides