Export thread

Hello everyone

Thanks for letting me join. USAF living overseas right now looking for some help. I've been searching all over trying to find a muffler for my LawnBoy.

Year = 1984
Model = 7271 with BBC

I'm pretty sure the part number = 684089 which has been discontinued.

Here are a few pics from another forum - HERE.

Any ideas on were to look?

TIA
Clayton

The best places are ebay and lawnmower salvage yards. Shouldn't be much of a problem.

Lawn Mower Parts, Small Engine Parts & Much More! | PartsTree.com - Briggs, MTD, Toro, Cub Cadet, Husqvarna, Troy-bilt...

Thank you for serving.

Thanks

Thanks for the replies.

I can't spend the big money to buy from Partstree so I'll start looking on ebay and salvage yards.

I love my Lawnboy but it seems like a bad design to put the muffler under the deck exposing it to grass and the damp. I've tried hard to keep it clean since I've owned it but however had it before me didn't love it as much.

Are there any other models that I could yank a muffler from????

Thanks again!

Hi Clayton, your original muffler was a stamped steel assm and was replaced by a multi piece aluminum casting on later model mowers. The steel muffler would rust out , while the thicker alum. casting will hold up. All of the BBC equipped LB mowers use the same muffler. They sometimes show up on Ebay.

If your mower is "rough" enough to have a rusted-out muffler, then you might be better off finding a good salvage mower and using yours as a parts source for it.

Phototone said:

If your mower is "rough" enough to have a rusted-out muffler, then you might be better off finding a good salvage mower and using yours as a parts source for it.

Click to expand...

A mower being in "rough" condition has nothing to do with a poorly designed muffler with blind passages for dampening the two cycle bark, these blind or dead end passages accumulate acid water vapor which is what causes the rusting through of the steel muffler shell. That and owners that don't keep the under side of the deck clear of grass build up, between the top of the muffler and the bottom side of the deck. The later cast aluminum thick walled mufflers on the later BBC models solved the problem whether it was a mint condition well maintained mower with a rusted out muffler or a beat up piece that no one made any attempt at servicing it, if you have the early steel muffler it will rust out regardless of the condition of the mower.

LB8210 said:

Hi Clayton, your original muffler was a stamped steel assm and was replaced by a multi piece aluminum casting on later model mowers. The steel muffler would rust out , while the thicker alum. casting will hold up. All of the BBC equipped LB mowers use the same muffler. They sometimes show up on Ebay.

Click to expand...

Thanks for the info. That makes sense that LB would recognize a bad design and address it with improvements on future models.

I don't really know what other models where equipped with BBC and when looking on ebay, I have no idea which muffler would fit my model. Any suggestions on what to look for?

TIA

Phototone said:

The best places are ebay and lawnmower salvage yards. Shouldn't be much of a problem.

Click to expand...

This is going to be hard to do while living in England. I'm not sure how popular lawnboys were in the UK and I'm not sure the Brits do a salvage yard for mowers.

I'd love to have an extra mower to use for parts but again they'll be hard to come by and expensive. The BBC doesn't work on my mower as well as having problems with the muffler, I could use a bunch of spare parts.


I 'll have to look into it and ask around. Thanks.

secaII4884 said:

This is going to be hard to do while living in England. I'm not sure how popular lawnboys were in the UK and I'm not sure the Brits do a salvage yard for mowers.

I'd love to have an extra mower to use for parts but again they'll be hard to come by and expensive. The BBC doesn't work on my mower as well as having problems with the muffler, I could use a bunch of spare parts.


I 'll have to look into it and ask around. Thanks.

Click to expand...

Well, there WERE Lawnboy mowers in the European market, I believe assembled in Belgium. The Brits have salvage yards for almost everything.

I will pull up a list of mowers with the BBC clutch and a list of BBC models that used the cast muffler, but I will not have time until poss. Monday. Stand by for this info. This may help you find one for parts or the parts either in England or the US or on Ebay. Search Ebay by Lawnboy BBC and something may turn up. All BBC models used the same clutch and the cast BBC muffler will fit all models equipped BBC. Hope this helps you locate the needed parts.

Is this the muffler?

LB8210 said:

I will pull up a list of mowers with the BBC clutch and a list of BBC models that used the cast muffler, but I will not have time until poss. Monday. Stand by for this info. This may help you find one for parts or the parts either in England or the US or on Ebay. Search Ebay by Lawnboy BBC and something may turn up. All BBC models used the same clutch and the cast BBC muffler will fit all models equipped BBC. Hope this helps you locate the needed parts.

Click to expand...

LB8210 - thank you so much. That would be super helpful.

d_sharier said:

Is this the muffler?

Click to expand...

No, the muffler I have is a complete 360 degree piece. It encompasses the entire deck. I'll try and take a pic of it sometime in the near future - not sure when.

thanks though

That is the bottom view of the cast muffler for a BBC LB. This muffler will interchange and fit in place of the doughnut shaped steel BBC muffler. The cast muffler is composed of two gaskets,a cover plate, a shield plate, and the body casting, all held together with many bolts.

LB8210 said:

That is the bottom view of the cast muffler for a BBC LB. This muffler will interchange and fit in place of the doughnut shaped steel BBC muffler. The cast muffler is composed of two gaskets,a cover plate, a shield plate, and the body casting, all held together with many bolts.

Click to expand...

So you're telling me this is the type of muffler I should be looking for??

Welcome and good luck with your search. Please let us know what you come up with.

secaII4884 said:

So you're telling me this is the type of muffler I should be looking for??

Click to expand...

Yes, This is the muffler you are looking for.

These are the model I could come up with that have a BBC with a STEEL muffler. 7231,7270,R7270,8240R,8240,8290,6261,8402,7232,R7271,6262,8403,8241,R8241,8155,8156,8157,M21BMRA,M21BMRB,M21BMRC,M21BMRD,680501. The following have BBC with a CAST muffler. The first use I could find was 1990 on model S21BSNA, 1991 on S21BSR, 1992 on680545. This is all of the info. I have as my book only covers up to 1992. There are most likely more newer models with BBC that would have used the CAST aluminum muffler. Hope this will help you locate a muffler. If you go to Lawn Boy's web site and use model #680545 you can get a better idea of what the muffler parts look like.

LB8210 said:

These are the model I could come up with that have a BBC with a STEEL muffler. 7231,7270,R7270,8240R,8240,8290,6261,8402,7232,R7271,6262,8403,8241,R8241,8155,8156,8157,M21BMRA,M21BMRB,M21BMRC,M21BMRD,680501. The following have BBC with a CAST muffler. The first use I could find was 1990 on model S21BSNA, 1991 on S21BSR, 1992 on680545. This is all of the info. I have as my book only covers up to 1992. There are most likely more newer models with BBC that would have used the CAST aluminum muffler. Hope this will help you locate a muffler. If you go to Lawn Boy's web site and use model #680545 you can get a better idea of what the muffler parts look like.

Click to expand...

Thank you so much for taking the time to list the differences.



Thanks again!

Here are some better pictures.


View attachment 24164View attachment 24165

Took the old muffler off today. Pretty sad. This thing had been extremely loud for some time.

I think this was the first hole



And this is the latest hole



Should have a cast aluminum muffler headed this way before too long.

Thanks to everyone who helped out on this thread.

Update

Update -

I received the cast aluminum muffler from d_sharier in the mail last week (as seen in the pics in the above post by him). The muffler bolted right up and wow, what an improvement. The exhaust note is once again the way it should be.

Big thanks to everyone who helped with my thread. A huge thanks to d_sharier for his patience selling me the muffler and extremely fast shipping, I would buy parts from him any day.