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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Posted on Jan 02, 2017


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1 Answer

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
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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.
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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

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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

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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)

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Oil/water or petrol/oil mix leak through gearbox

Hi, Kengra100 the answer to this question is way above my pay grade 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. If necessary, transport your bike 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 problem.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Suzuki RG250 Service Manual
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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.

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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.

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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

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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.

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