Posted by J. Clarke on October 9, 2009, 6:23 am
Rob Kleinschmidt wrote:
>> Rob Kleinschmidt wrote:
>>> On Oct 8, 5:26 pm, "Stephen Cowell"
>>>> I've got a buddy
>>>> that *had* to have Mobil1 installed before he took delivery...
>>>> his bike puffs white smoke when he gets on it, still, after
>>>> three years.
>>
>>> Good point. I suppose "new Dnepr" isn't really an
>>> oxymoron after all. I don't particularly believe synthetic
>>> damages seals though.
>>
>> Not so much damages as they don't respond the same way.
>> one of the objectives in formulating
>> different motor oils is to produce the same degree of swelling in
>> common seal materials. If an oddball material is used then going to
>> a synthetic lubricant might swell it more or less than it is
>> supposed to resulting in either a too tight or too loose seal.
> Common explanation seems to be early synthetics may have
> had problems but current generation don't.
> http://www.popularmechanics.com/automotive/how_to/4213451.html
Look, my point was not that synthetics cause seal problems, my point was
that this is a Dnepr, a Russian bike that uses Russian seals which may be
made of materials that the people who make oil never thought to test. I'm
not saying that they ARE made of such materials, just that one should be
aware of the VERY REMOTE possibility that they are.
>> As for rings not seating right, depends on the oil and the design of
>> the engine--some exotic cars come with synthetic these days.
> I recall going through at least one grade of lighter oil
> followed by one oil change of dino before going to synthetic.
> On an air cooled engine though, I wouldn't run anything else
> and yeah right from the factory on some not so exotic newer
> engines too I think.
>> If the guy's bike puffs _white_ smoke when he starts it, that's
>> coolant, not oil, and he should find out why it's happening rather
>> than assuming that
>> it's because synthetic oil prevented the rings from seating.
> Common advice I've heard for new rings is "ride it like you
> stole it".
> I'd probably try synthetic on a Dnepr myself. Works fine on my
> fairly similar '80s era BMW airhead.
Personally I would and if started to leak then I'd go back to dinosaur blood
and see if it stopped leaking.
Posted by Bruce Richmond on October 9, 2009, 11:51 pm
> Rob Kleinschmidt wrote:
> >> Rob Kleinschmidt wrote:
> >>> On Oct 8, 5:26 pm, "Stephen Cowell"
> >>>> I've got a buddy
> >>>> that *had* to have Mobil1 installed before he took delivery...
> >>>> his bike puffs white smoke when he gets on it, still, after
> >>>> three years.
> >>> Good point. I suppose "new Dnepr" isn't really an
> >>> oxymoron after all. I don't particularly believe synthetic
> >>> damages seals though.
> >> Not so much damages as they don't respond the same way.
> >> one of the objectives in formulating
> >> different motor oils is to produce the same degree of swelling in
> >> common seal materials. If an oddball material is used then going to
> >> a synthetic lubricant might swell it more or less than it is
> >> supposed to resulting in either a too tight or too loose seal.
> > Common explanation seems to be early synthetics may have
> > had problems but current generation don't.
> >http://www.popularmechanics.com/automotive/how_to/4213451.html
> Look, my point was not that synthetics cause seal problems, my point was
> that this is a Dnepr, a Russian bike that uses Russian seals which may be
> made of materials that the people who make oil never thought to test. I'm
> not saying that they ARE made of such materials, just that one should be
> aware of the VERY REMOTE possibility that they are.
> >> As for rings not seating right, depends on the oil and the design of
> >> the engine--some exotic cars come with synthetic these days.
> > I recall going through at least one grade of lighter oil
> > followed by one oil change of dino before going to synthetic.
> > On an air cooled engine though, I wouldn't run anything else
> > and yeah right from the factory on some not so exotic newer
> > engines too I think.
> >> If the guy's bike puffs _white_ smoke when he starts it, that's
> >> coolant, not oil, and he should find out why it's happening rather
> >> than assuming that
> >> it's because synthetic oil prevented the rings from seating.
> > Common advice I've heard for new rings is "ride it like you
> > stole it".
> > I'd probably try synthetic on a Dnepr myself. Works fine on my
> > fairly similar '80s era BMW airhead.
> Personally I would and if started to leak then I'd go back to dinosaur blood
> and see if it stopped leaking.- Hide quoted text -
> - Show quoted text -- Hide quoted text -
> - Show quoted text -
My 1972 R75/5 BMW weeped around gaskets when I switched to full
synthetic. Silicone gaskets cured the problem.
http://www.rockypointcycle.com/Merchant2/merchant.mv?Screen=CTGY&Store_Co=
de=RPC&Category_Code=B10
Where the Dnepr isn't really an old bike it might not have the same
problem.
Posted by Stephen Cowell on October 9, 2009, 10:49 am
> If the guy's bike puffs _white_ smoke when he starts it, that's coolant,
> not
> oil, and he should find out why it's happening rather than assuming that
> it's because synthetic oil prevented the rings from seating.
OK, I'll have him check the antifreeze in his Wide Glide...
it happens when he *gets on it*, not on starting, btw.
__
Steve
.
Posted by Vito on October 9, 2009, 2:23 pm
> I don't particularly believe synthetic damages seals though.
I agree. Some will sneak past them better than dino blood.
Posted by 1949 Whizzer on October 8, 2009, 12:12 pm
> Here's the problem, I tried to starting the bike at 9 in the morning.
> Temperature was around 5 degrees C (41F) and kick as I might, it just
> wouldn't fire up. I finally got it going by bump starting it downhill
> (we live near the summit of a small (100 meter) urban mountain).
> Any help appreciated,
It's pretty obvious that your Diaper doesn't suck air hard enough to
draw fuel out of the float bowl.
Owners of Brit bikes figured out the solution long ago.
Turn the idle SPEED screw down until the throttle slide closes
completely to
make the engine suck up the gasoline needed to start it.
This even helps on carbs that have ticklers on the float bowl.
On another note, I stopped at Big Bubba's Bad BBQ last night to see
what all the commercial fuss on local radio was about.
I talked to a loud mouthed Harley type who was installing a home
brewed side car on the *left side* of a Hinkley Triumph.
He insisted that it was a British bike, so the side car should go on
the left side.
He couldn't understand why that was likely to get him killed while
making a left turn in California.
He wasn't interested in meeting the local guru of sidehacks either...
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>>> On Oct 8, 5:26 pm, "Stephen Cowell"
>>>> I've got a buddy
>>>> that *had* to have Mobil1 installed before he took delivery...
>>>> his bike puffs white smoke when he gets on it, still, after
>>>> three years.
>>
>>> Good point. I suppose "new Dnepr" isn't really an
>>> oxymoron after all. I don't particularly believe synthetic
>>> damages seals though.
>>
>> Not so much damages as they don't respond the same way.
>> one of the objectives in formulating
>> different motor oils is to produce the same degree of swelling in
>> common seal materials. If an oddball material is used then going to
>> a synthetic lubricant might swell it more or less than it is
>> supposed to resulting in either a too tight or too loose seal.
> Common explanation seems to be early synthetics may have
> had problems but current generation don't.
> http://www.popularmechanics.com/automotive/how_to/4213451.html