How to Diagnose a Briggs V-Twin that BOGS DOWN at Full Throttle 

Good video. Nice walk-through of the troubleshooting process. That problem wasn't where I initially thought you'd end up.

Good video i working a john deer tractor with same problem , boogs down when blades are enguage , so now i know where to look thanks

GREAT VIDEO

The shroud tin is missing on cylinder of the first plug you pulled out. If it ran like that, it would have overheated and caused some damage.

Bucks small engineer DY. Una explicacion muy detallada gracias por TU video

I’m very surprised it running at all and he was still mowing with it Strange things happen in the mechanic shop Yes take it apart asap Let’s see it

Good vedio!!!!!!!!!yes open it up

Great video. Go Flyers!

Buck, I too am a DYI backyard wrench with a few more years under my belt. My suggestion to you would be ; before you go through rebuilding the carb and all the messing with spark plugs, Why not after you first take them out, take a compression test on each cylinder and compare. Also to test for one bad plug, just switch them to see if it gets hot on the other side. I have a John Deere with the same engine. My loss of power problem is the choke is incorrect and I can't seem to find anyone who has the same set up. It only has ONE cable operating both the throttle and choke but the choke linkage does not line up with the carb like to properly operate the choke. I don't know if someone has replaced the carb with a similar model having the choke link in a different format.

Nice work, I'd put a rod in it, way cheaper than a new mower and they're close to junk already, love to see the repairs if that's what you decide to do

Spark, compression, fuel. This is the diagnosis path i would always take on any ICE. Since it would seem that it is a broken rod, i would really want to rip it open to see how it can run without clanking and eating itself from broken metal parts. I had an issue where the motor had no compression. Found out it was a failed plastic cam gear that Kohler uses. Yes plastic. $50 replacement cam gear (metal) and it was back in action.

Wow just got mine back from the shop it does the same thing . And I just had the shaft seal replaced to . Man I hope its not that . Wow but the its doing the same things yours is and it was was just in the shop at a tune of 977.00 to

This is very interesting. I have a 2004 from new Honda v twin OHC ride on mower . Was going to one cynlinder regularly. After weeks of futering. (That's a Ulster Scots term) . It is now going to 1 cylinder under load ONLY now. I have spent a considerable length of time getting it to run on two cynlinders up to this point, working on the carb. But I am now at a loss. It starts fine but if put under load with drive train occasionally and every time going into grass it goes onto one cynlinder. Stop it and it starts fine again?. Any thoughts?

Great video!!! If it was mine,,,, I would try to fix it if the rest of the mower is in OK condition. The OLD MOWERS ARE BUILT MUCH BETTER..... the new mowers are about $2000 and up.. today's mowers are built so CHEAPLY and are junk. That old one was built to last for a very long time. You will be lucky to get 5 to 6 years on a NEW MOWER before it starts giving you PROBLEMS. Like I said if it was me I would replace motor easiest way or rebuild it

The number one cylinder is the one furthest from the seat

Go ahead and fix it. Those older Briggs and Stratton engines are worth fixing. 🤔🤔🤔🤔🤔👍🏿

For the knowledge of this situation, l would like to see the in side of the engine.

I’m thinking jet stopped up but make sure piston is moving

I would open it up and if it’s only a connecting rod, I would attempt to replace it. If not, be on the look out for at least a 18-20HP Intek for $50-$80 and stick it on there.

I would rebuild it. Hope the owner gives you the ok to do it

The plugs had me thinking bad intake valve on 2. Definitely not a carb. Fuel issue would affect both cylinders. I would look for a used engine. Well worth a couple hundred bucks to save a few thousand.

The first thing I would have done after checking for spark is take a compression test, that would of showed you your problem.

Its worth fixing I think I would repair it but if it was mine or given to me it would be worth it

Take it apart and fix it

I would have to get a used motor for it

Almost similar problem here on a brand new machine (Ride-on/Lawn Tractor) However it is intermittent, sometimes goes single - lots of banging and farting, & sometimes sweet on 2. Swapping plugs over swaps the misiring cylinder.! I plead guilty of pinching one plug fpr another B&S single cyl 360cc, and puttying a 360cc single type plug in the twin. Not happy! And that "Crook" plug works fine in another B&S single (Push mower) Musical plugs later I prove they are all OK, but the twin likes its correct plug. Better get a correct type new pair and stop stuffing about! I suspect B&S singles now have suppressor resistors built in to the plugs, and the V twins do not. AaaarrrrrgggH!

I would price a modern engine if cheap enough. Otherwise get a new mower. Other parts on the mower are ancient also so I would get a newer mower. They aren’t that expensive. Not like cars now.

get a used engine