Bad fuel. Either drain and refill the tank with fresh gas or just get out on the highway and run it out with a couple ounces of fuel stabilizer added. Once it hits reserve fill the tank with the correct amount of fuel additive (I like Sea Foam).
Si estas en EEUU, pídelo en Amazon y mandalo a un Amazon Locker (Amazon tiene casilleros en varios sitios en EEUU en donde puedes a pasar a recoger el producto si te estas quedando en hotel y no puedes hacer que te llegue directamente) https://www.amazon.com/Sea-Foam-Extreme-SF-16-Seafoam/dp/B0002JN2EU
Try running Seafoam through it. People differ on how effective it is, but it's inexpensive and easy to use so worth a shot. Sea Foam SF-16 Motor Treatment - 16 oz. , white https://www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_cp_api_glt_i_QZ75S6YTZ938QNQ97A7A
Oh sorry bro, it's a commercial product. please do not put anything ocean related in your bike. Here's a link, I tried to get to UK Amazon to get you one that works:
https://www.amazon.co.uk/Sea-Foam-Extreme-SF-16-Seafoam/dp/B0002JN2EU/ref=sr\_1\_3?keywords=seafoam&qid=1642276958&sr=8-3
I had issues with mine, I'm pretty sure the fuel ports in the carburetor was gummed up from old gas. No matter how much I pulled the string, the mower just wouldn't start.
After a bit of research and before I busted out the tools to see if I could actually take the stupid thing apart, I ended up mixing sea foam into a bit under 2 gallons of gas and refilling the tank and just pulling the cord over and over again for about 5 minutes.
The sea foam appears to have dissolved whatever was gumming up the works and, after the engine spit out a bunch of smoke, actually ran. It idled pretty rough but after the full tank it was running like new.
Ever since then I've used sea foam in my gas and the worst I've gotten was a difficult start for the first mow of the season, and it's been 5 years since then.
I have never actually seen or used the IC5 Seafoam. THIS is what I typically use.
Other than that, not really. I use Seafoam about once or twice a year as needed like I said. I also run the same gas in my vehicle and try not to switch it up if I can help it. I am pretty set on Chevron and Shell as they pretty much have the same gas.
You should also add some seafoam or something similar and make sure it gets in the carbs. Just draining gas out if the tank still leaves some in the carbs, and over time it can reduce performance if not prevent running entirely.
I’ve used a half can of Seafoam in my first two tanks after draining with good results. Drain some of the gas into a glass jar and that will tell you how much contamination or water you might have in your tank.
www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_em_api_c_6NKYAbKYPQ8AH
The easiest way I know of for checking for a vacuum leak is to get a can of starting fluid and while the engine is idling, spray short bursts on the carburetor and on the intake manifold listening for the idle speed to change. If the idle speed doesn’t change at all no matter where you spray it except into the air filter, you may be OK for a vacuum leak.
Cleaning inside the carburetor side walls and the slides was an assumption I made, but here’s an idea before you take the carburetors apart, given your level of expertise. I would get a can of seafoam and dump a full can in your full tank of gas and run that full tank of gas through the machine to see if things get better. That concentration is completely safe, I’ve actually run it straight through a lawn mower engine and cleaned things up real well. If you’ve never taken a carburetor apart, it’s not that bad but if you don’t have to then don’t. Most any parts store, Walmart or Amazon has it.
https://www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_em_api_c_6NKYAbKYPQ8AH
You’ve probably been using ethanol fuel and I think you actually said that, when small engines are stored improperly it gums up the carburetors pretty badly. You can mix some seafoam in with the new non-ethanol fuel that you bought and you might be able to get it to run through it a few times and eventually clear it out, but a carburetor rebuild is usually the only fix and it’s almost not worth it on most small engines.
https://www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_em_api_c_6NKYAbKYPQ8AH
I would consider draining the tank and carbs, then use a full can of Seafoam and a full tank of premium non-ethanol gas and see if you can run it thru to clean the fuel system.
https://www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_em_api_c_6NKYAbKYPQ8AH
That looks like normal carbon buildup, there are professional services and injector cleaner’s that a shop can run through it. But I’ve had good success using Seafoam and a few applications directly introducing it into a vacuum line will clean this up very well.
https://www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_em_api_c_6NKYAbKYPQ8AH
If your bike has a fuel filter (I don't know, mine doesn't) inspect or replace. Check fuel line for kinks. Replace the spark plug. You might also run a little SeaFoam through your carb. Gasoline can turn to varnish in some of the small passages of a carb.
As others said, most likely your fuel supply is clogged. You may be able to get away with just using the Sea Foam. Read the label, dump as much as you need in the tank. Let it run for 5 minutes, turn the engine off, let it work its magic overnight.
Try some Seafoam in the gas. I've seen it used to cure this exact problem. They sell this at any hardware or big box improvement store, usually in the lawnmower section.
A fuel treatment to keep the system clean.
A product intended to clean the internals of an engine http://www.amazon.com/Sea-Foam-SF-16-Motor-Treatment/dp/B0002JN2EU/
Sorry! Definitely missed this message
Sea Foam SF-16 Motor Treatment - 16 oz. , white https://www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_apan_glt_i_VJ9W5N3Y8Z20MAS25P9M
Title: Sea Foam SF-16 Motor Treatment - 16 oz.
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Using something like this might help the lifter tap if it does not go away
Sea Foam SF-16 Motor Treatment - 16 oz. https://www.amazon.com/dp/B0002JN2EU/ref=cm_sw_r_cp_api_glt_fabc_XHSGG1AE9TR90M8QA2J6. This one. Suck it through the throttle body. Check YouTube for a video. Super easy. I did it.
Try cleaning your throttle body and run a can of Seafoam in a half tank of gas and see if that helps. Also you might get one of these Blue Tooth OBD2 readers that you can use with smartphone apps like Torque. You can check error codes and watch realtime data from many of the sensors on your engine.
Sea Foam comes right to mind.
Its a pretty amazing product.
Its a gas additive and stabilizer that you can also just straight up run your engine on with zero gas. In fact, that is the SOP for cleaning the crap out of old engines at the place I used to work.
You can get it at any auto-parts store.
I have used Seafoam for 20 years in over 10 vehicles with great success. I pour in 1/4 of a can about every season (so, four times a year) and if I winterize my bike, I use it as a gas stablilizer.
I have run gas that sat in a tank with seafoam for THREE YEARS and the gas was good, bike fired right up and didn't even smoke.
Here is a video showing what it can do. 1:33 you can hear the before. 9:16 is the sound after.
https://www.youtube.com/watch?v=agAWXnT4-EQ
I have seen numerous vehicles "restored" like the one in the video above.
Seafoam? This stuff ? I just wanna make sure.
Try some sea foam first. http://www.amazon.com/Sea-Foam-SF-16-Motor-Treatment/dp/B0002JN2EU
All of this is easily done in a few hours with no experience, patience and you tube.
For the variator a strap wrench
Make sure you really tighten up the variator when putting it back together. You don't want that nut to loosen.
You really don't want to go too low on the weights. It will end up with you going really fast from 0-15 mph then not going any faster. Think about a granny gear on a mountain bike. I would go a half gram lighter but no more then 1 gram. You can get kits with lots of different weights if you wanna play around . After the first time you will be able to change rollers and belt in 10 mins.
The law is stupid and I agree completely. Getting it to top out around 45 makes for a safer situation all around.
Cleaning a carb is not hard but access is kinda annoying. If you decide to skip it (no harm done) try adding some http://www.amazon.com/Sea-Foam-SF-16-Motor-Treatment/dp/B0002JN2EU .
Once you get the old gas out, run some SeaFoam fuel treatment through it.
I've saved many small engine carbs with this stuff...
There's this stuff called Sea Foam
The bottle gives off strong snake oil vibes because it claims to be good at so many different things but I'll be damned if it didn't help out my mower tons.
I apparently didn't do a good enough job draining the gas out of my mower at the end of the season and it was real rough when I pulled it out in the spring. Hard to start, have to let it idle for 5ish minutes before it doesn't sound like it's about to die, does die when going through thick grass. I thought I would have to disassemble the thing to clean the throttle plate (my research indicated the throttle plate was clogged, particularly the idle hole).
Did some research, found sea foam, and treated my gas with it. Within about half a gallon the mower was running like new and still starts on the first pull (well, after the first start of the season) 5 years later.
Even if it doesn't solve this particular problem, it's still something that really helps keep my mower going and might help keep yours alive longer than a season.
Get some SeaFoam, dump that shit in your tank, and go somewhere deserted and let your engine run in neutral for a while. Pump the gas a little bit every now and then too.
Ideally you should put some kind of air filter to catch all the gunk over your exhaust, but....
You'll pass.