Briggs & Stratton 14.5hp Hunting

[Neil-R]

Hi just wondered if anyone has any ideas sold a new Alko T15-92HD tractor , its fitted with a briggs 4145 single cylinder intek engine , ran like poo when we originally built it 12 months ago , been stood in showroom , now sold it discounted to clear , only problem is that it runs like a pig , spoke to briggs they said change main jet for a larger one which i did , still runs like pants , set up governed idle speed according to briggs procedure , still pants , idles perfectly @1900 rpm , when the throttle is opened up to full speed approx 3000rpm it hunts and surges , i have also tried removing the limiter cap from the idle speed mixture screw & adjusting , this only improves the idle as you would expect .

Tonight i tried a jet from a dead 17.5hp just as an experiment , still no change .

Also changed the white briggs filter to the proper red gravity feed type just in case.

If anyone has any ideas i would be grateful as due to deliver friday morning.

The model data is 31A507-4117 B1-120515ZD

Thinking there may be some swarf in the carb perhaps from manufacture ??.

Still had enough for one night i am packing up now been mental so far this season.

[Neil-R]

Forgot to say runs perfect with choke partly on @ full throttle with or without load

[WeFixIt]

Have you check the fuel tank !

Have had one or two with plastic swarf stuck in the fuel pipe fitting were it can't be seen and just restricts the fuel flow enough at max rpm to cause running problems **** and insects can cause the same blockage

 

 

 

Is it a chipper, is it a mower or another broken stump grinder who cares we'll fix it!

[GardenKit]

Hi Neil. Its frustrating isnt it? Its all down to emission regulations with manufacturers bringing existing engines down by leaning them out. Bring back the polluters!

 

I find they usually perform smoothly when warm, but have had the odd one that does not. I have had some success in fitting jet P/N 699733 in that engine as per Briggs bulletin CSB-1006.

[Neil-R]

Thanks for the replies i did find a little plastic swarf in the fuel filter Wefixit.

The problem was cured by fitting the whole carb from a dead 17.5hp , ran a treat even @ 3000rpm so there was something up with that one , no time to strip & clean .

Delivered to customer today and all good.

Barrie i know what your saying about these Euro regs ,thats the jet we fitted , speaking to Nick @ Briggs he said some dealers have been drilling the jets even larger to get them to run right!!.

Had a new Lazer ride on the other day only ran @ 2500rpm when you engaged the deck the thing nearly shook itself to pieces , removed limiter screw in throttle linkage = 2800rpm happy days all good , there was no way the machine could have been delivered as it was , it was just a joke .

[GardenKit]

Thanks for the replies i did find a little plastic swarf in the fuel filter Wefixit.

The problem was cured by fitting the whole carb from a dead 17.5hp , ran a treat even @ 3000rpm so there was something up with that one , no time to strip & clean .

Delivered to customer today and all good.

Barrie i know what your saying about these Euro regs ,thats the jet we fitted , speaking to Nick @ Briggs he said some dealers have been drilling the jets even larger to get them to run right!!.

Had a new Lazer ride on the other day only ran @ 2500rpm when you engaged the deck the thing nearly shook itself to pieces , removed limiter screw in throttle linkage = 2800rpm happy days all good , there was no way the machine could have been delivered as it was , it was just a joke .

Glad you have it sorted Neil, its always a pain when you get last minute problems.

[Neil-R]

Tell me about it Barrie especially when i discounted the thing down to shift it on as had it on display for over a year .

[GardenKit]

Know what you mean.

 

And those carbs can be a pain to get back together properly sometimes I find. I serviced an MTD 603 yesterday, including cleaning the carb bowl. Must admit I did it with the bonnet side panel in place which is not the best practice.

 

Came in this morning to find a wet patch under the exhaust, and yes, sure enough the fuel has gone from the tank into the pot (and sump).

 

happy days