Question about 1988 Suzuki DR 750 S

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Petrol is mixing with the gearbox oil

The bike was running fine hasnt been started in a wile. tryed to start it. it started then died out checked the oil and its full with petrol and oil. its a dr750 1988 model.

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The pistons rings are worn out which is allowing the petrol to mix ,you must change the piston and piston rings in your bike...



Good luck...

Posted on Dec 09, 2008

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Bought it at local, start alright with petrol. When try with 2 Stroke RYOBI Synthetic Oil hard to start. Should i just use normal petrol oil?


no --- 2 strokes use a special 2 stroke oil ==not ordinary engine oil==
the difference is that the 2 stroke oil is specially blended to mix with petrol and will not block up the fine jets in the carby
it also "sticks " more readily to the metal components in the engine thus preventing wear
as a point of interest most small engines do not like E mix fuels either
so for trouble free operation --2 stroke oil mixed in the correct ratio with either 89 or 91 octane petrol and it will start first pull every time
use the primer bulb sparingly or the choke until it fores

Oct 19, 2015 | Homelite Garden

1 Answer

I have an aprilia rx125 2008 & the oil petrol mixing system has been blocked off and now petrol & oil are mixed in the petrol tank, but the bike starts for 3-5seconds then stops & petrol comes out of


Hi Steve, and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue please visit the websites below. Good luck and have nice a day.
DOWNLOAD 2008 Aprilia Rx 125

Dec 04, 2011 | 2008 Aprilia RX 125

1 Answer

The bike has had the autolube system capped off & change to petrol & oil mixing in the tank. it was starting but i think the air-fuel ratio may be wrong or the carburetter needles sticking & what rati


Hi Anonymous, for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix/test or parts inquiry. If necessary transport your vehicle to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your issue. For more information about your issue please visit the website below. Good luck and have a nice day. DOWNLOAD 2008 Aprilia Rx 125

Dec 04, 2011 | 2008 Aprilia RX 125

1 Answer

Hi I got a 98 yz 250 new clutch plates piston negosiled barrel new ring and shortcut the gears I kicked it and it started on the 3 rd try I ha then added more fuel and mixed 200 ml oil to 5 liters petrol...


Replace the spark plug to new one they rarely come good or be reliable once fouled shouldn't need to clean carb but if were mine I would clean it anyway
regards Jamie

Aug 04, 2011 | 2008 Yamaha yZ250

1 Answer

What kind and how much oil should i put in the crank case of my 1975 suzuki ts 185 and would to thin oil cause it to lose compression?


ts 185 is a two stroke, the crank case oil is actually only the gearbox oil, the volumne is caste onto the side cover(like 750cc).near the filler cap.
The engine oil is mixed with the fuel and is pumped in from the oil tank under the seat.
The wrong oil or no oil in the tank under the seat can cause it to lose compression. and cause engine damage.
Visit a bike shop and get motorcycle gear oil20w50 for gearbox. and two stroke motorcycle engine oil for the oil tank.
As it is quite old someone may have removed the oil tank, thinking they will make it go faster or save weight or another stupid reason, if this is so you need to mix the two stroke oil with the petrol when you fill the tank at approx 25-1 ( 25 litres petrol mixed with 1 litre of oil)

Mar 21, 2011 | Suzuki TS 185 Motorcycles

1 Answer

Starting trouble


If the odd substance was at the bottom of the float bowl it was water. If it were oil it would have mixed with the gas and you would not have seen it. Drain the carb into a cup to remove any additional water from the carb and petrol tank. When no more water comes from the tank you should be okay to start the bike. Clean air filter? Water gets into the tank via condensation in the tank.

Dec 31, 2009 | 2001 Honda NSR 125 R

1 Answer

1994 Kawasaki ZZR-400 Leaks oil and doesnt start sometimes.


that box is called the air box, its where you engine breathes in its air. you say its leaking oil? these boxes are normally a bit oily but only really surface oil. If you can actually see liquid oil you have a problem with your petrol shut off. When the bike isnt running petrol will leak into the engine through the piston. When you start the bike all the petrol mixed with the engine oil will be pumped back into the air box. also check the level of the engine oil, if too much has been put in there then that can also be pumped back into the air box. If the petrol and oil has been mixing you must change the oil as petrol thins the oil and your bike could catch fire, the engine wear will be really bad.

Aug 29, 2009 | 1994 kawasaki ZZR 400

2 Answers

I bought my first bike used & it rode fine! Its dying


Possibly if too full oil is getting to combustion chamber? Have you pulled a spark plug to see what they look like? You should check owners manual for correct procedure on addin/changing oil. I always recommend the shop manual for usually under $15 at auto/cycle parts stores.

Jul 26, 2009 | 2006 Suzuki GS 500 F

2 Answers

Bike starts fine with the choke and will idle without it when warmed up. However, when I twist the throttle the engine dies. I have just had a bunch of work done with an independent shop, including...


hmmm, a few posibilities, might well be split cab diaphragms but overhaul should have spotted that. sounds like either too much gas or not enough, either flooding/gassing up or fuel starvation. could try running it without the aire filter too see what happens. it should run weak so if bike is better then you have too much gas, if bike worse then runnig weak to start with. I have seen this before with one particular cause.... petrol tap was leaking, gas runs past pistons when bike not running, soaks past and into crankcases. as breather recycles vapour back in to air box, when bike warm it's as rich sas hell. take of oil filler cap on engine and have a good sniff. you should smell only oil, if it's a strong smell of petrol, change oil and filter, dump petrol tap or see if new seals available.

May 09, 2009 | Yamaha XJ 700 X Maxim Motorcycles

3 Answers

Oil is a grey colour in the engine of my yz 125 2001


Your bike is water cooled. Some of that water is leaking into the gear box. The cylinder gasket is the likely leak. I would let the shop take a look at it instead of trying to fix it yourself.

But be sure there is not an external source for the water. Do you wash the bike often? Ride the creek bed often? Leave the bike where the lawn sprinkler gets the bike wet? Leave it out in the rain? Change the oil and keep the bike dry. If the problem comes back then go see the dealer.

Mar 19, 2009 | 2003 Yamaha YZ 125

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