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sorry for late reply, was really busy. You were right, the leak doesn't mean much. Replaced the gasket at the intake manifold (both), still nothing (BTW. both gaskets are "DIY", hard to get legit ones). Surges but less. The springs are worrying, but I imagine it doesn't mean much until the...

Hello again. Removed the intake manifold to check for any cracks (as I can't remove the cover while the engine runs as the dipstick is stuck to the cover). Gasket seems fine so I filled the manifold with water and it shown multiple leaks at the engine side. Putting the water under pressure...

Hello again. It definetly has too much air (or not enough fuel to be exact). When I manually use the choke lever on the carb, and manually close it about 20% the engine smooths out how it should run. When I let off of the lever, it returns back to surging. Same for when I manually block the...

Thanks for your quick reply. Tried spraying WD40 between the carb and intake manifold and nothing changed. Will try spraying it on the intake manifold next time. Figured the springs were setup wrong, but changing it did absolutely nothing but lower the RPMs. Also, didn't note before: I put a...

Hello folks, back with a good old surging issue. It's a Briggs 675EX Quantum engine with surging issues. At first it was horrible when it arrived. Replaced the air filter, removed and cleaned the carb, replaced bowl seal and assembled it all. Ran much much better afterwards but not perfect at...

Hi and thanks for the answer! Never gave it any thought... a screw for me means it's adjustable, my bad. See the images, hope they help. The ignition is a simple magneto directly tied to sparkplug, nothing else. Sure I'll post the ID tommorow, couldn't make it yet. Also, it doesn't mean too...

Hello folks, I can not get my BVS153/Vantage engine to run smoothly. It not that it revs up and down and such governor issues, it's more like constant smaller misfires and non consistent running. No matter low or high throttle, it always has that issue. It doesn't bog down when under load, or...

Hey and thanks anyone for the given help At the end, it was the air filter I put in. It isn't the original one, so issues were expected. As it was too thin, the air/fuel mixture was wrong and governor went nuts all the time. I added more filter material, dipped it into oil and adjusted the...

Thanks for the answer, but sadly not possible. Literally no Yamaha dealers in my area, or even remotely close. Also, if there was one, I hardly believe they would repair a generator from the 90's. Buying the manual is more than what the repair is worth. Thanks anyways!

Hello folks, so I have gotten a Yamaha EF600. At first, it didn't run at all as fuel leaked from the fuel pump/cock located under the gas tank that pushes gas up to the carb, and cycles back to the tank. I cleaned the pump, as it was totally blocked, afterwards no leaks were to be seen and it...

Thanks for the tip! For now it's "fine". I don't really expect much from it anymore.

Hi everyone, sorry for later answer. Thanks everyone for their answers! Thankfully, I think it was (once-again) the dirty carb, atleast for now - it works (as much as the bad carb design allows it to). I opened it up again, cleaned it throughout, completely took apart the white "cartridge"...

Hi once again. So I tried a different tank, w/o the fuel filter and the same issue. It starts running nice up until fully warm or put slightly uphill. Currently I'm cleaning the carb, once again. I'll see if that helps anyhow. Can you also please explain how you managed to get the choke...

Hi and thanks for your reply. So, pulled off the breather tube and it ran actually good for a minute or so. Next start, and it ran bad (still, better a bit) yet again. It definetly did help, but not for too long, I imagine until it warmed up fully. Nothing can be noticed to be coming out of...

Hello folks, so one of those engines with the plastic carbs without a primer bulb, with the white "cartridge" in it, a 625EXI engine has issues with the RPM/throttle surging up and down. Before this happend, the engine refused to run properly at all, so I took the carb apart, cleaned it, the...

I wouldn't really take any acid to my tongue haha, I avoid even touching it. But I have acid all over the battery even though that I don't charge it, it took me like 3 years to find out that they are equipped with battery charging alternators. But I've placed it relatively safely... right...

Thanks for the information! I should then really go and buy a sealed battery then. But the flooded one that I used so far usually gets wet at the top after mowing, and I'll get the charging system aswell... just to be sure!

Thanks, the document really come in handy. Seems like I do need a regulator after all. Thought that I diode would be enough, as no regulator wasn't strappd on my mower when I got it. I knew that the hole on the dipstick wasn't just a placeholders. Thanks for the advice! P.S sorry for late answer!

Thanks, seems like I do need a regulator. No idea why it isn't already fitted on my owner. Thanks again, very helpful!

Hi, and sorry for the late answer. Why shouldn't I use a flooded lead acid cell on the mower? These sealed cells are damn expensive, I know they're safer and longer lasting, but damn 20Ah costs more than a 75Ah car battery. But I'll try to get the voltage regulator, even though some schematics...

Hi and sorry for very-late answer, was really busy lately. I checked both with and without battery connected, without the battery it's 25+V, with the battery it's 13-14 and slowly rising (as it charges), but I don't think it's very safe to do so. These regulators do work on single diode setups?

Hello folks, my used MTD (13dh452e676) had his cables fiddled around with (very badly that is). Also the charging wires have been disconnected. So I went trying to fix it. Found out that the engine has a two output wire from the alternator, one with a diode and one with pure AC for lights...

No worries, I figured it out :)

Alright, thanks for the advice! New carb it is then

So, no repair kit they sell online wouldn't help? Seems to me that it contains all the wearable parts. But anyways, there's an obvious issue with the carb. Even though, at some trimmers I've seen online, the bulb acts the same as mine. Maybe the problem lies somewhere else, since it doesn't run...

Bump. Anyone got any insights?

Yes, that one. Fits both on FS38 and FS45

Hi and thanks for your answer. But this isn't it, sadly. I placed a 100% working carb from a different Stihl, and the trimmer works just fine, so that concludes that's a faulty carb, not the fuel lines, filters, and what not. Also note: the carb I placed it on still has the limiter caps on it...

Thanks for your answer! The carb is a ZAMA S97 (sorry for not noting before, thought the Stihl model was enough..). The engine is fine overall, just like the spark plug, fuel lines, filter, spark arrestor etc. since I placed a carb from a different Stihl (FS 45), but it's the same carb. And the...

Hello and thanks for your answer. I did the tests. This is how it went: This went good, no bubbles anywhere but the return line when pressing, and no bubbles when letting it off (BUT, there sometimes is a small bubble on the black plastic where the fuel bulb sits in. There's a small (factory)...

Hello everyone, so a FS38 trimmer (looks fairly new) has some issues. First off, the primer bulb sucks air in every time you let off the bulb, lots of air bubbles to be seen. Also, the bulb doesn't fill more than like 50% or less no matter how often you press it. Secondly, the trimmer runs...

We'll see. Oversized pistons and tings are the last thing on my mind due to it is to find ANY piston for this engine, and a oversized/special one would be a real headache to get and/or pay for. I really do hope honing will do the trick. If not, hey, buying oil every 2 weeks it is then.

Here where I live, the cheapest ones (which are total crap) would take me 2-3 monthly wages to pay it off, so. the cheapest ones are expensive for me. But I do feel like it's time to get a upgrade anyways.

Well, the mower is serving me well. And it's a nice vintage mower with still perfectly working gearbox for the wheels, a key and a starter, a battery charger coil, and large bag, and everything pretty much is stock on it, nothing is broken and it cunts the highest grass without any issues. I...

Thanks a lot. That is indeed very helpful. I'll be tearing it apart as soon as the season ends. And I will probably write a new thread sooner or later. Thanks a lot again!

Eh pics of what? Engine still wasn't open, and for now I can provide audio only. Maybe you want to see the engine on the outside? Anyways, engine could be loose, could be checked. Blade surely isn't - that guy ain't going anywhere, it's literally impossible to take it off without a 80% change...

Good to know! Thanks

Thanks for the reply. As for the oil, the dripping started a few weeks ago, I suspect a bad crankcase gasket (the engine is 25+ years old). And it is burning oil ever since I own it. I'll stay with honing and replacing piston rings for now, since no machinists are near me in the area, and I...

Hello folks, I want to know if my engine has a rod knock, since I'll be a doing replacing all the gaskets as soon as winter hits since oil has started leaking all around the block. So, if I'm already opening, I'd like to replacing the rod (if it's the part that's bad) too. Also going to replace...

So, lately my Tecumseh Vantage 35 (not sure if it's this one - I swapped the engine a few years ago, used to be a BVS143, and the new one was a direct fit, it is 100% the same as my old one, just a bit newer) started losing power after 10-20 minutes of mowing. It simply doesn't take gas, it...

Hello folks, so I got a mower engine to repair, the one stated in the title. It won't start, air filter is clean, carb works (sparkplug is wet)... I replaced the sparkplug with one from a mower that I confirm that works, and the engine still has no spark, yes I did test the sparkplug. I...

Hello folks, I mowed with my MTD tractor the other day, and I realized that it became kind of... lazy in the last time. So I thought that I should replace the spark plug, never actually looked at it ever since I own it. And I realized that the spark plug isn't the one that should be in it. It's...

Hello everyone, I have 2 BVS 153 engines (I guess they're both 153) and both burn oil. Most of time they just burned oil and that's it, and the spark plug is just left very dirty and burned, but cleanable. But in the last few times of mowing the spark plug is always wet, full of oil (and also...

Hello everyone, I sarted using a (probally) older lawn mower, which has an OHV engine, not sure who made it, because there are no stickers on it. Anyways, by looking at my Gutbrod lawnmower, it says, to clean it, it has to be placed on it's right side, where you spill the oil in. I tried it on...

Thank you for your info, my problem is probally the belt, which is an aftermarket, not from mtd 100%, I'll post some images showing the deck and belt number (if you need it more detailed just ask). I can't find any springs, but, when we turn off the blades with a handle, keeps rotating, but the...

This is all of the info I can find on it:

Hello everyone. We bought a MTD spider 92rd 42" 11.5hp lawnmower tractor. We bought it for about $200. It is in solid state, but the main problem is the mowing deck (blade deck). 1. the belt was not original, it was too large so it couldn't mow 2. we bought an aftermarket belt which works...

Hello everyone here, I'm new here I own 2 Tecumseh BVS153 engines (Gutbrod lawnmowers), one which is totally normal, one with ignition key and "pulling help". They are probally very very very old, and, still they're running great. The are no problems, unless the problem with blue smoke. Both of...