Questions tagged [two-stroke]
A type of internal combustion engine where all of the cycles of combustion occur in one 360 rotation of the crankshaft.
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How much performance change can be expected from changing 2-stroke mix-in oil?
I have a 2 stroke paramotor:
Paramotor with a parrot on the propeller.
It is a 235cc 2-stroke engine with carburetor fuel delivery and magneto ignition. The transmission is a direct drive pulley ...
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1answer
25 views
What's the power problem?
2-stroke marine engine (200 Yam) starts and revs just fine out of gear. Put into gear and will only achieve 40kph or so.
Old petrol (50:1)? Changed tanks and new fuel - same.
Boat hull dirty? A little,...
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1answer
38 views
Compression testing a 2-stroke boat motor
On an outboard two stroke engine, what tests can I do with a compression tester, (and how to carry them out)? It's a Yamaha 200 hp V6 2-stroke boat engine.
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1answer
36 views
Can gasket sealant be used to seal friction fuel connections?
I have a two stroke trimmer with a plastic fuel tank and plastic fuel lines. At some point, these lines have been replaced with new lines that don't quite fit in the holes the old lines did (~0.5mm ...
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0answers
15 views
How can find if the CDI of my bike is working fine?
I have a 2001 Yamaha RX 135 2 stroke motor bike and have installed an aftermarket performance CDI which claimed to give me better performance and RPM rev.
But since I have installed it I seem to feel ...
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1answer
77 views
Chainsaw chain spins after start until I hit the throttle
Immediately after I start my chainsaw (Craftsman 358.350280), without holding the throttle, the chain moves fast. As soon as I press and release the throttle, it comes down to idle fine and the chain ...
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63 views
Purpose and correct name of plastic inserts in 2-stroke cylinder
I recently replaced the cylinder and piston on a broken chainsaw 2-stroke engine and I found 2 plastic inserts inside the cylinder. I'm wondering what purpose these serve, and what the correct name ...
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83 views
Which engine type gives more HP- two or four cycle?
Same max. RPM and CC of course. And if possible, an explanation would be nice. Thanks!
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18 views
Is back-pressure (or air-intake suction) of ANY value to a typical little(20-->50cc) 2-stroke engine? Like chainsaws, blowers etc [duplicate]
Have been searching for this answer for a while, typically I look for an answer & give-up when nobody can provide one but this time I'm going to learn the truth!!
For chainsaws, weed-eaters etc, ...
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1answer
257 views
CC per HP in a 2-stroke engine?
I have a bunch of 2-stroke engines and the websites that I found only tell me about 4-cycle engines. Do you happen to know the ratio of cc to HP?
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2answers
126 views
Exhaust back-pressure Q on simple 2-stroke yard-equipment engines:
I am having trouble getting a precise answer- is back-pressure necessary on a little single-cylinder 40cc 2-stroke like a chainsaw or a blower? I ask because people frequently modify mufflers to ...
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My Two Wheeler scooter - Powers OFF Intermittently while driving
I am using a two wheeler (Petrol/Gasoline vehicle).
I haven't driven the vehicle for like 30-40 days.
Today I had a trouble turning ON the vehicle.
After some tries, I managed to turn it ON ...
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0answers
52 views
Does a 2-stroke engine needs "break-in" after replacing cylinder and piston?
I just replaced cylinder and piston (with new gasket, rings, etc) in a 2-stroke 52cc string trimmer engine. It started at the first pull and sounds great, I let it run for 5 minutes, adjusted the carb ...
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2answers
213 views
1966 Suzuki K11 Oil Change
Got a old suzuki that's running and working just fine. I got the fuel ratio for the bike which is 20:1 this a two-stroke. What I'm trying to figure out is the oil for the bike. Normally do 10w30 or ...
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1answer
70 views
How fast a 2 stroke engine wears, how much fuel it consumes(compared to a 4-stroke engine) and how to properly mix fuel with oil [closed]
I want to buy a 2 stroke engine to build a minibike. I am 15 years old and i never owned a 2 stroke engine before. I know they wear faster and consume more fuel than a 4 stroke engine. But how fast ...
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36 views
Boring Engine Cylinders
I owned 1978 YAMAHA 175 Enduro (2 stroke) and i had to bore the engine cylinder and now i am using 1.00 piston in it.But i noticed that it's not speeding up above 80,when it reaches 80 it's like ...
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1answer
140 views
Primer bulb not drawing fuel
I had an old 21cc two stroke weedwacker engine that I had lying around and was trying to rebuild it for use in a possible hobby project. It sat with gas for a very long time so I disassembled the ...
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1answer
76 views
Craftsman Leaf Blower wont start, ignition coil failure?
In a previous question I asked about repairing a carb for my leaf blower and the repair didnt hold so I bought a new one. Replaced fuel filter and fuel lines, also replaced the carb gasket.
I seem to ...
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0answers
9 views
chainsaws&blowers: Any guides/instructions on installing DIY air pre-filters on units with weak OEM filters?
I really love the idea (in link below) of Echo's 'pre-filter' setup to ease/assist the actual/main air filter and would love to DIY something, am guessing a stiff-enough, heat tolerant mesh material ...
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1answer
573 views
Two-stroke engine seizing at full throttle
I have an odd problem with a 50 cc air-cooled two-stroke scooter engine that keeps locking up at full throttle, then freeing up again.
I just bought the bike second hand with a new belt needed ...
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1answer
55 views
This seemed a good spot for engine-stuff, so: What are some ways that *may* lead to greater power in a chainsaw?
This seemed the best area to ask since it's not a tool question so much as an engine question, I use a high-end premade fuel and always have a sharp or sharp-ish chain, am just hoping to learn the ...
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5answers
5k views
2 Stroke engine magneto ignition system
I've got a 2 stroke 1 cylinder engine and its ignition system doesn't seem to work.
I'm having problems with my magneto ignition system and I need help connecting everything up. I think I've ...
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2answers
2k views
50cc Scooter only runs when manually choking air intake
I bought a 50cc Yamaha Zuma off of craigslist, and it's had some aftermarket parts put on it (exhaust, 70cc big bore kit, new carb). I cleaned the carb and converted the throttle to a one cable set-up ...
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0answers
257 views
Johnson 9.9 2 stroke wont idle anymore
I have a 1999 Johnson two-stroke 9 hp outboard motor. I have a 10 foot pelican that I put it on but the other day I almost flipped the boat after making a sharp turn, water got all in the boat about ...
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285 views
1997 Mercury 9.9 HP 2-Stroke starting issue
I've been banging my head on a starting issue with the outboard motor mentioned in the subject line (it's a manual pull-start).
Problem is that when I pull it over, it doesn't sound/feel like it even ...
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1answer
52 views
Turn push/pull motion into up/down?
I don't know if this is the right place to ask, but I have an RC 2 stroke engine with a choke with an arm that requires up/down motion to open/close.
The problem is I can't place a servo below, so I ...
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2answers
420 views
If an engine starts does that mean compression is fine?
I am looking at buying a second hand 2-stroke engine. I have seen a lot online about checking compression before buying used engines. I don't have a compression tester, but will buy one if necessary.
...
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2answers
236 views
Diagnosing a boat that wont start
Having some problems with my '92 Boston Whaler Rage jet-boat again.... See this post for all relevant boat info:
Starting a 2 stroke jet boat after several years
Ok, so I did basic troubleshooting, ...
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1answer
43 views
Two stroke engine stalls during incle
Sir I have 1967 two stroke Harley Davidson golf cart. It runs great on level ground but when I try to go up a incline hill it wants to stall and it only makes it up the hill using the choke. I changed ...
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1answer
1k views
2 Stroke making choking sound on full throttle after carb replacement
I have a Yamaha RX 135 which is a 2 stroke bike, and I have replaced it's carburetor , Previously it was stock 26mm round slide mikuni carb , and its been replaced with 30mm Flat slide mikuni.
After ...
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1answer
6k views
String trimmer revving too high at WOT?
Someone gave me a 52cc string trimmer for free because they say it wasn't working. We would only get it started by dropping a few drops of fuel into the cylinder, and it would idle quite high for a ...
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1answer
148 views
How to clean a muffler from the inside?
I want to clean the muffler (final exhaust pipe) of my motorcycle (2004 Cagiva Raptor 125). It is a 2 stroke engine so a bit of oil has sort of... sedimented on the inside of it. How am i supposed to ...
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2answers
5k views
Too much smoke in my 2 stroke
I have a 2004 Cagiva Raptor 125 and for the last week it's been letting out smoke a bit too hard:
I have had the bike for a year and a half now. I did an engine rebuild as soon as I got it because ...
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3answers
2k views
Oil sump for 2 stroke vehicles
I do not know if there is any oil sump for a 2 stroke vehicle and basically it is mixed along with the gasoline. Why is that so in a 2 stroke vehicle. And can we have an oil reservoir or a sump of oil ...
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5answers
2k views
Two-stroke vs four-stroke design
Besides the apparent differences in fuel-injection, ignition, and valve timing, are there any other differences in the design/build of two-stroke and four-stroke engines?
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0answers
94 views
Weed Wacker Not Running Properly
I have a Remington weed wacker that is ~2 years old. It worked great for the first 2 or 3 months but then I could not get it to work properly. I have tried new gas, new plug, adjusting the idle on ...
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2answers
2k views
Adjust carburettor without hi-speed adjustment
I've got a Walbro WA226 with no hi-speed adjustment screw. Unfortunately, it seems that the issue is in the high-speed jet. Adjusting the low screw can set me up so long as the throttle is at full, ...
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2answers
813 views
Carb. Rebuild or Adjustment?
Just put a rebuilt 2 stroke and brand new Mikuni SBN carburetor in my jet boat. Got her running no problem the first couple times, now it seems I can't get any gas into the carburetor from the primer ...
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0answers
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Jet Boat, Cavitation or Misfire?
My jet boat is making a 'putting' noise when trying to accelerate.
You can find all details regarding my boat here: My Boat Info
The noise seems to happen in the mid-rpm range; 4,000 - 4,800 RPMS, ...
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2answers
14k views
No compression on my two stroke
I was recently riding racing my Honda 250R (1986) (informally), and, all of a sudden, the engine quit completely. I tried letting out the clutch in second gear (push starting) with my momentum, but ...
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1answer
436 views
Is an exhaust mute bad for 2 stroke engines? [closed]
Will an exhaust baffle have any bad effects on a 2 stroke engine if it's used all of the time?
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4answers
2k views
Starting a 2 stroke jet boat after several years
The parents in law gave me a jet boat, it hasn't been started in 5 years. The boat resided in NH on a trailer on their yard for 5 years, so it has seen freezing temperatures frequently. From what I ...
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6answers
18k views
What makes two-stroke engines less fuel-efficient than four-strokes?
It is a commonly-held belief that two-stroke engines are less fuel-efficient than four-stroke engines, and some example BSFC figures appear to confirm this as well.
But what is it that causes two-...
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2answers
26k views
Why do two-stroke engine exhaust pipes look so strange?
Two stroke gasoline engine exhaust pipes are shaped strange. They expand into a wide diameter and then shrink down to a very small diameter where the exhaust gasses emerge into the environment.
- ...
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2answers
206 views
Honda R8X-S heat seize
I've got a Honda R8X that heat seizes when I'm riding it when it goes over 40mph.
The lad I got it off said he had it re-bored and that it was run in.
Will I need to re-bore this again or is there ...
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2answers
3k views
Two-Stroke Diesel Engine - Do they use forced induction on them?
As I have indicated before, I'm very diesel ignorant. I just know the basics, very basics.
In a two-stroke diesel engine using forced induction seems necessary but at the same time I see challenges. ...
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1answer
3k views
Two-Stroke vs. Four-Stroke Diesel Engines - What is most commonly used in heavy vehicles?
I am not well versed in diesel engines. To prove my point, I've learned in the last month that a two-stroke diesel engine actually exists.
My Question.
What kind of diesel engine (four-stroke or ...
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1answer
73 views
Snowblower - 2 cycle oil without stabilizer
I'm not sure if this is the correct forum for this question.
I have some 40:1 mixed gas (for my snowblower) that is about 6 month old with no stabilizer added. I haven't t tried it yet but should ...
3
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1answer
345 views
JLO Rockwell 2F600
I have an old hovercraft that uses a small aircraft engine in the front to power both the lift and forward propulsion. I was hoping to find any kind of manual or literature on the engine itself. The ...
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0answers
3k views
2 cycle engine has spark and new carb won't start [closed]
I have a 49cc 2cycle engine that I replaced the carb on. It has fresh gas and
appears to have a spark. I can't get it to fire even if I put some starter fluid in the air intake. It seems to have ...
