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11 votes

Can I dilute 2-stroke gas and run it in my riding mower to get rid of it?

As long as you dilute it there should be no issues. Mixing a gallon or so with 5 gallons takes a 50:1 fuel-to-oil ratio to about 250:1. In other words, the engine will never notice it.
jwh20's user avatar
  • 12.1k
10 votes
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Two-stroke vs four-stroke design

Depends. A key point of 2-cycle engines is that a thing called scavenging happens with the piston at the bottom: at the end of the power cycle/ beginning of the compression cycle. During ...
Harper - Reinstate Monica's user avatar
9 votes
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Starting a 2 stroke jet boat after several years

Water in the cylinder usually means water in the crankcase on a two stroke Pulling water out of the cylinder doesn't mean you pulled out all the water. Two stroke engines use ports on the side of ...
DucatiKiller's user avatar
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8 votes

What makes two-stroke engines less fuel-efficient than four-strokes?

The efficiency of any internal combustion engine is directly related to its Carnot efficiency, where efficiency equals the inlet air temperature minus the exhaust temperature divided by the inlet ...
Paul Ellis's user avatar
7 votes
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Carb. Rebuild or Adjustment?

I'm not a watercraft Mikuni guy, but I've dealt with a few two-stroke carbs that work in this manner. There's a few possibilities: The internal filter screen is clogged, but I'm discounting this as ...
SteveRacer's user avatar
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7 votes
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Can I dilute 2-stroke gas and run it in my riding mower to get rid of it?

You should be able to run this straight through your lawnmower without issue. As long as you aren't running it through your car with a catalytic converter it should be just fine. The thing which 2-...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes

Starting a 2 stroke jet boat after several years

Water in the cylinder? The engine is in bad shape from improper storage. Even if you get it freed up there will be rust on the cylinder walls and piston rings, which will cause more damage if you ...
Moab's user avatar
  • 7,990
6 votes

Two-stroke vs four-stroke design

For Two Stroke engine: One working stroke in each cylinder per revolution of crankshaft. Light in weight. Moving parts are few. Mechanical efficiency is more. Thermal efficiency is less because a ...
Dan Khan's user avatar
  • 169
5 votes
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If an engine starts does that mean compression is fine?

You cannot assume just because it starts it has good compression. It can have minimal compression and still start and run just fine. That minimal compression is going to be different for every engine, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
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Adjust carburettor without hi-speed adjustment

Yes, you can bend the tab The metering diaphragm enriches the entire range on every circuit. If the fuel level is higher it will require less vacuum under Venturi's Law to pull the fuel from the '...
DucatiKiller's user avatar
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5 votes
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Poor man's 2-stroke strimmer air filter

I would actually suggest you to buy a foam air filter element that is big enough. Usually they are sold for certain specific types of engines, like certain lawnmowers or certain generators. However, ...
juhist's user avatar
  • 14.6k
4 votes

Is an exhaust mute bad for 2 stroke engines?

It depends on the exhaust system. If it is a road bike with an exhaust system designed for the road, you need to keep the silencer/muffler/mute on it for optimum performance. Only a full race system, ...
Roger Mellie's user avatar
4 votes

Two-stroke vs four-stroke design

Not sure if you count that under “besides the apparent”... but IMO the single most striking peculiarity of a two-stroke is that it uses both sides of the pistons to work on gas volumes†. That's what ...
leftaroundabout's user avatar
4 votes
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Which engine type gives more HP- two or four cycle?

Theoretically, with all other factors being equal, the 2 stroke engine should produce 2 times the power of the 4 stroke engine. The reason being that the 2 stroke engine has twice as many power ...
jwh20's user avatar
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3 votes
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No compression on my two stroke

TL;DR: Either there's a problem with the head gasket, or with the piston rings. Remember, the piston rings fly over the openings in the cylinder wall, and there's no radial force onto the section ...
sweber's user avatar
  • 7,057
3 votes

Two-stroke vs four-stroke design

Yes, number of power strokes per revolution, less complicated : fewer moving parts, emissions or pollution levels. Have a look here : http://mechstuff.com/differences-advantages-disadvantages-of-4-...
Solar Mike's user avatar
  • 34.6k
3 votes

Poulan chain saw

A light weight grease can be useful to keep the needle bearings in place while completing the assembly. It will provide lubrication and eventually be worn or be washed away by the normal lubrication ...
fred_dot_u's user avatar
  • 4,560
3 votes

What is the difference between a 2 stroke and 4-stroke engine?

A 4-stroke engine will pass smog LOL. Engines take a volume of air, combine it with fuel, put it into a cylinder and then do two strokes: compression stroke and power stroke. The cylinder is now full ...
Harper - Reinstate Monica's user avatar
2 votes

Starting a 2 stroke jet boat after several years

At best, "persuading" the engine to turn over will result in damage when it is started (because of rusty bearings, etc.). You might not even get that far, and you'll damage a piston or twist the crank ...
Trapeze Artist's user avatar
2 votes

Is it okay to run aviation fuel (100 low-lead) in a dirt bike?

AVGAS 100LL has TEL (tetra ethyl lead), locally about 1.3g / US Gal. The TEL may cause some fouling of the spark plugs. It will not shorten your engine life. It is used extensively by motocross and ...
mongo's user avatar
  • 2,115
2 votes

What makes two-stroke engines less fuel-efficient than four-strokes?

Very much depends on the particular 2 stroke and 4 stroke engines. But a major advantage of a 2 stroke is that they can be produced incredibly simply and so cheaply. An engine with 3 moving components ...
Kickstart's user avatar
  • 571
2 votes

Derbi Senda 50cc - Low Compression, will not run properly

just had this problem on a friends bike after a late night recovery call I couldn't fix roadside so threw it in my garage - 99 derbi gpr50r symptoms and quick checks... the spark was there, carb was ...
PPPunk  Disorderly's user avatar
2 votes

Oil sump for 2 stroke vehicles

Because in a two-stroke, the air-fuel charge gets taken into the crankcase. If there were a sump of oil there, it would get sucked into the engine. There are many two-strokes where the oil is stored ...
Ceshion's user avatar
  • 1,698
2 votes

Diagnosing a boat that wont start

For an engine to start, you need three things - compression, fuel and spark. You've confirmed yo have compression, so we can rule that out. You've also confirmed that you've got fuel (you state in ...
Nick C's user avatar
  • 28.8k
2 votes

Too much smoke in my 2 stroke

The Cagiva Raptor 125 and most two strokes motorcycle engines have a crankshaft oil seal. These keeps oil out of the crankcase and where it belongs, usually in the transmission. It's possible for ...
Eric Urban's user avatar
  • 1,286
2 votes

Oil sump for 2 stroke vehicles

So there are quite a few two stroke engines. For gassers like chain saws, the oil and fuel (gasoline) are mixed and introduced into the crankcase by the carburetor. The oil lubes the engine, and is ...
mongo's user avatar
  • 2,115
2 votes

This seemed a good spot for engine-stuff, so: What are some ways that *may* lead to greater power in a chainsaw?

The absolute key to more power on a small two-stroke is the exhaust. Designed properly, it will scavenge well and improve the engine's volumetric efficiency. Special exhaust was Mr. Stihl's rise to ...
SteveRacer's user avatar
  • 12.4k
2 votes

Two-stroke engine seizing at full throttle

Likely it's overheating under full throttle load. There could be many causes: Dirty or obstructed cooling fins Wrong oil/gas ratio Carb clogged or jetted wrong, causing a lean condition Air leak, ...
dwizum's user avatar
  • 1,144
2 votes
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Can gasket sealant be used to seal friction fuel connections?

Explore another method. The sealant may work, but it's only a stop gap measure. You're right it needs to be airtight. Any leaks will cause it not to run (it will suck air instead of fuel). I've got ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote
Accepted

2 Stroke engine magneto ignition system

The main issue with the ignition was that i was missing another High Voltage coil, but before knowing that i had replaced the capacitor, bolts, sanded everything clean, so the connections would be ...
PotatoMan's user avatar

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