YS 140 sport problem

[Bill Glaze]

Ed:
Just out of curiosity, did anyone ever try bronze valve guides?  The 
worked well in the drag boat engines I built; can't begin to say how 
many I built, and they lasted a long time, too.  Bill Glaze

Ed Miller wrote:

> The seat/guide assembly falling out of the head has plagued all YS 
> 120/140 engines. Had a new SF do it myself. YS will replace the head. 
> Now Harley's problem in '79 wasn't AMF in so much they got caught off 
> guard with the advent of unleaded gas. I had a '79 80 inch Shovel FXS 
> I bought new. The valve guides were tool steel and short. The #2 
> cylinder would get hot and stick the exhaust valve open. I fixed my 
> bike myself the winter of '79/80 with sodium filled exhaust valves, 
> hardened valve seats, longer cast iron valve guides I modified from 
> another engine and I modified the lower spring retainers for valve 
> seals. Harley came out with an exact kit fall of '80. AMF was the best 
> thing that ever happened to Harley, without AMF Harley would have gone 
> out of business in the early 70's. I bet there are a few AMF exec's 
> wondering what if now though.......
> Ed M.
> ----- Original Message ----- From: "John Pavlick" <jpavlick at idseng.com>
> To: <discussion at nsrca.org>
> Sent: Saturday, March 26, 2005 1:04 AM
> Subject: RE: YS 140 sport problem
>
>
>> Holy sh*#... This YS stuff sounds like the old AMF days at Harley (valve
>> seats falling out, valves bending and sticking because the guides 
>> were too
>> short ['79], etc.). Lately, a few people have asked me why I don't fly a
>> 4-stroke in my pattern plane. My answer is: "Because O.S. doesn't 
>> make one
>> big enough". Uh-oh, I hope I didn't start something here. So much for 
>> things
>> being quiet on the list...
>>
>> John Pavlick
>> http://www.idseng.com
>>
>>
>>> -----Original Message-----
>>> From: discussion-request at nsrca.org
>>> [mailto:discussion-request at nsrca.org]On Behalf Of Joe Dunnaway
>>> Sent: Friday, March 25, 2005 11:35 PM
>>> To: discussion at nsrca.org
>>> Subject: Re: YS 140 sport problem
>>>
>>>
>>> I saw this happen on a 140 L at one of the contests last year...
>>> Talked to
>>> the guy at the next contest and he had put the seat back in and peened
>>> around it.  He said it worked fine.
>>>
>>> Joe
>>>
>>> ----- Original Message -----
>>> From: "Bob Kane" <getterflash at yahoo.com>
>>> To: <discussion at nsrca.org>
>>> Sent: Friday, March 25, 2005 10:28 PM
>>> Subject: Re: YS 140 sport problem
>>>
>>>
>>> > Wow, that is a new one on me. I would send it back to
>>> > YS Performance for a new head. My guess is the seats
>>> > are cast in place, there is little you could do to
>>> > repair it.
>>> >
>>> > --- iflyrc24 <iflyrc24 at columbus.rr.com> wrote:
>>> >> I was trying to start my YS 140 Sport and could not
>>> >> get it to fire. While cranking with the starter the
>>> >> compression went totally away. I took the valve
>>> >> cover off and noticed the intake valve clearance was
>>> >> about 1/8" or so. I pushed in the valve to see if it
>>> >> was stuck and it fell into the cylinder. I removed
>>> >> the head and the intake valve and seat assembly came
>>> >> out of the head fully assembled with spring and
>>> >> keepers in tact.
>>> >>
>>> >> Can the intake assembly be reinstalled in the head
>>> >> and what holds it in place? Other than aligning the
>>> >> intake ports is there any other alignments to watch
>>> >> for?
>>> >>
>>> >
>>> > Bob Kane
>>> > getterflash at yahoo.com
>>> >
>>> >
>>> >
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