Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Toro is using a Lincon 163cc engine in both their 421 and 621.  Both have the same engine but differ slightly in part number.

Toro lists these for the part numbers:

for the 421, 119-1942 1 Engine-Lc168Fds-1

for the 621, 119-1943 1 Engine-Lc168Fds-1

   They are probably the same engine with some minor change.

    The 421 has some sort of carb or EPA type listing as ACGPS 1631SA

    The 621 has BCGPS 1631SA.

     Anyone know what the difference in these two engines are?  I suspect a jet or governor spring change.  So far I have not been able to locate a parts breakdown for these two. 

for the 421, 119-1942 1 Engine-Lc168Fds-1

for the 621, 119-1943 1 Engine-Lc168Fds-1

   They are probably the same engine with some minor change.

    The 421 has some sort of carb or EPA type listing as ACGPS 1631SA

    The 621 has BCGPS 1631SA.

     Anyone know what the difference in these two engines are?  I suspect a jet or governor spring change.  So far I have not been able to locate a parts breakdown for these two. 

UPDATE:

    Went through the drawings and the only difference between the 421E and 621 is the carb listing.  The carb on the 421 is a Huayi which I think is similar to the carb on the Honda GX200 clones.  Looks like it might be easy to turn a 421 into a 621.  The Huayi carb are pretty cheap.

trouts2 wrote:
I'm fairly sure that the 163cc Loncin engine on the 2009-2012 is not rated at 4 HP, they may be 5.5 to 6.0 hp.  I don't have an urge to bump the RPM on this engine, plenty of power for a SS as is.  I had my Honda GX160 rpm bumped up and it just didn't sound and feel right.  So I'm not going to attempt it on this Loncin engine.

>>>I'm fairly sure that the 163cc Loncin engine on the 2009-2012 is not rated at 4 HP, they may be 5.5 to 6.0 hp. 

 

   What I’ve seen so far is the ratings are all 5.5hp but nothing "official" from Toro. 

 

>>>I don't have an urge to bump the RPM on this engine, plenty of power for a SS as is.

 

    It certainly seems like an engine with plenty of power but that’s without using it so not worth much.  I really like the sound of the Loncin.  I’m excited about this engine but frustrated by no snow.

 

    As is from the factory mine runs at 3900 rpm.  I’ll muck with it to see what seems comfortable for it. 

 

   Stopped at a Toro dealer.  The mechanic was to familiar with the Loncin so not sure about it’s proper rpm setting.  He thought it was made by Toro.  Going by what they said it looks like the 421 has been dropped and only 418 and 621’s available. They had no idea what the 4 or 6 stood for.  My guess is the old 421 and new 621 are the same thing with slight case mods and the Q option.