YS 140 sport problem

Sat Mar 26 18:09:09 AKST 2005

We use cast iron guides with chrome plated valve stems in our big diesels, 
and they go 20,000 hours between rebuilds.
----- Original Message ----- 
From: "Ed Miller" <edbon85 at charter.net>
To: <discussion at nsrca.org>
Sent: Saturday, March 26, 2005 8:38 PM
Subject: Re: YS 140 sport problem

> They work but weren't as durable in the Panhead and Shovelhead's. Too much 
> heat variation and bad geometry, over time they would loosen in the head. 
> Mostly drag racer's used them. The early Harleys didn't shed heat well and 
> the lifter, pushrod, rocker to valve tip geometry made one think the 
> engineers were doing a destruction test rather than building a "durable" 
> air cooled V Twin. 30 to 50K was all you could reasonably expect out of a 
> pre Evo top end. The Evo took that number to 60 or 80K. Now the current 
> Twinkies, except for a few small initial issues, are nicely done. To bad 
> the EPA will effectively legislate them into extinction in 5 years.
> Ed M.
> ----- Original Message ----- 
> From: "Bill Glaze" <billglaze at triad.rr.com>
> To: <discussion at nsrca.org>
> Sent: Saturday, March 26, 2005 10:27 AM
> Subject: Re: YS 140 sport problem
>
>
>> 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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