Rotax 503 ignition timing

Rotax 503 ignition timing

Post by Teijo Salline » Thu, 09 Nov 2000 04:00:00


Rotax 503 with CDI ... can I use a strobe to time it (I can't see how) or do
I have to get a dial gauge to find TDC?

TS

 
 
 

Rotax 503 ignition timing

Post by Stevem.. » Thu, 09 Nov 2000 04:00:00

You'll need a dial gage to find TDC and mark the flywheel.  And then use the
timing light to set the timing.  Remember this though.  The timing is
affected by the temp and mine had to be set within the first 30 seconds of
starting it cold.  I used a Inductive light from a car to do mine and it was
fine.  (i had it checked at the dealer after i set it).

--
L8tr...
Steve m...
web page:  http://www.telerama.com/~stevem52
L.H. Club page:  http://www.geocities.com/yosemite/7925


Quote:
> Rotax 503 with CDI ... can I use a strobe to time it (I can't see how) or
do
> I have to get a dial gauge to find TDC?

> TS


 
 
 

Rotax 503 ignition timing

Post by Ghostwhee » Fri, 10 Nov 2000 04:00:00

HUH???

Maybe I missed something here but there is no TDC and BDC on a 2-stroke
engine--it fires every time the piston is up


Quote:
> You'll need a dial gage to find TDC and mark the flywheel.  And then use
the
> timing light to set the timing.  Remember this though.  The timing is
> affected by the temp and mine had to be set within the first 30 seconds of
> starting it cold.  I used a Inductive light from a car to do mine and it
was
> fine.  (i had it checked at the dealer after i set it).

> --
> L8tr...
> Steve m...
> web page:  http://www.telerama.com/~stevem52
> L.H. Club page:  http://www.geocities.com/yosemite/7925



> > Rotax 503 with CDI ... can I use a strobe to time it (I can't see how)
or
> do
> > I have to get a dial gauge to find TDC?

> > TS


 
 
 

Rotax 503 ignition timing

Post by KR » Fri, 10 Nov 2000 04:00:00

TDC and BDC has nothing to do with 2-stroke or 4-stroke. 4-strokes hit TDC
once on the exhaust stroke and once on the compression stroke. It simply
means what it says, the piston is all the way up or all the way down.

KR


Quote:
> HUH???

> Maybe I missed something here but there is no TDC and BDC on a 2-stroke
> engine--it fires every time the piston is up



> > You'll need a dial gage to find TDC and mark the flywheel.  And then use
> the
> > timing light to set the timing.  Remember this though.  The timing is
> > affected by the temp and mine had to be set within the first 30 seconds
of
> > starting it cold.  I used a Inductive light from a car to do mine and it
> was
> > fine.  (i had it checked at the dealer after i set it).

> > --
> > L8tr...
> > Steve m...
> > web page:  http://www.telerama.com/~stevem52
> > L.H. Club page:  http://www.geocities.com/yosemite/7925



> > > Rotax 503 with CDI ... can I use a strobe to time it (I can't see how)
> or
> > do
> > > I have to get a dial gauge to find TDC?

> > > TS

 
 
 

Rotax 503 ignition timing

Post by Ghostwhee » Fri, 10 Nov 2000 04:00:00

ummm no,  TDC is the top of the compression stroke--BDC is the top of the
exhaust stroke


Quote:
> TDC and BDC has nothing to do with 2-stroke or 4-stroke. 4-strokes hit TDC
> once on the exhaust stroke and once on the compression stroke. It simply
> means what it says, the piston is all the way up or all the way down.

> KR

 
 
 

Rotax 503 ignition timing

Post by Ghostwhee » Fri, 10 Nov 2000 04:00:00

For Clarification:


Quote:
> ummm no,  TDC is the top of the compression stroke--BDC is the top of the
> exhaust stroke

In a four stroke engine

Quote:



> > TDC and BDC has nothing to do with 2-stroke or 4-stroke. 4-strokes hit
TDC
> > once on the exhaust stroke and once on the compression stroke. It simply
> > means what it says, the piston is all the way up or all the way down.

> > KR

 
 
 

Rotax 503 ignition timing

Post by Teijo Salline » Fri, 10 Nov 2000 04:00:00

Steve:

Question: In order to see the flywheel (magneto) you have to remove the
rewind coil housing. If you do this, you get no oil ... Where and how did
you mark the flywheel to overcome this?

TS


Quote:
> You'll need a dial gage to find TDC and mark the flywheel.  And then use
the
> timing light to set the timing.  Remember this though.  The timing is
> affected by the temp and mine had to be set within the first 30 seconds of
> starting it cold.  I used a Inductive light from a car to do mine and it
was
> fine.  (i had it checked at the dealer after i set it).

> --
> L8tr...
> Steve m...
> web page:  http://www.telerama.com/~stevem52
> L.H. Club page:  http://www.geocities.com/yosemite/7925



> > Rotax 503 with CDI ... can I use a strobe to time it (I can't see how)
or
> do
> > I have to get a dial gauge to find TDC?

> > TS

 
 
 

Rotax 503 ignition timing

Post by Stevem.. » Fri, 10 Nov 2000 04:00:00

On my 87 Plus(521 engine) (which has the oil pump in between the cylinders),
I took off the recoil.  Put the Dial indicator in the sparkplug hole.  Found
TDC and marked the flywheel (checked it and marked it, cause it already has
a line on it.. It's just not 100% accurate) and then figured where BDC it
was looking for and marked it.  Then I ran the engine with the (***) plug
out of the top of the flywheel side (to check the timing) and then did the
timing adj.  I had to pull the flywheel a couple of times and set it right.
Each time doing it only when cold.  It took a couple of days but I got it.
It's not an easy job.

--
L8tr...
Steve m...
web page:  http://SportToday.org/~stevem52
L.H. Club page:  http://SportToday.org/


Quote:
> Steve:

> Question: In order to see the flywheel (magneto) you have to remove the
> rewind coil housing. If you do this, you get no oil ... Where and how did
> you mark the flywheel to overcome this?

> TS



> > You'll need a dial gage to find TDC and mark the flywheel.  And then use
> the
> > timing light to set the timing.  Remember this though.  The timing is
> > affected by the temp and mine had to be set within the first 30 seconds
of
> > starting it cold.  I used a Inductive light from a car to do mine and it
> was
> > fine.  (i had it checked at the dealer after i set it).

> > --
> > L8tr...
> > Steve m...
> > web page:  http://SportToday.org/~stevem52
> > L.H. Club page:  http://SportToday.org/



> > > Rotax 503 with CDI ... can I use a strobe to time it (I can't see how)
> or
> > do
> > > I have to get a dial gauge to find TDC?

> > > TS

 
 
 

Rotax 503 ignition timing

Post by KR » Fri, 10 Nov 2000 04:00:00

I don't agree but no sense in arguing about it.

KR


Quote:
> ummm no,  TDC is the top of the compression stroke--BDC is the top of the
> exhaust stroke



> > TDC and BDC has nothing to do with 2-stroke or 4-stroke. 4-strokes hit
TDC
> > once on the exhaust stroke and once on the compression stroke. It simply
> > means what it says, the piston is all the way up or all the way down.

> > KR

 
 
 

Rotax 503 ignition timing

Post by Rob » Fri, 10 Nov 2000 04:00:00

Instead of marking the flywheel, I think you could mark the clutch.  And
Ghostwheel, sorry but TDC stands for top dead center and BDC stands for
bottom dead center.  TDC occurs when the piston is at the top of bore and
connecting rod is moving at the crankshaft end only.  BDC is the same but at
the bottom of the stroke.  2 or 4 stroke has nothing to do with it.

Rob


Quote:
> On my 87 Plus(521 engine) (which has the oil pump in between the
cylinders),
> I took off the recoil.  Put the Dial indicator in the sparkplug hole.
Found
> TDC and marked the flywheel (checked it and marked it, cause it already
has
> a line on it.. It's just not 100% accurate) and then figured where BDC it
> was looking for and marked it.  Then I ran the engine with the (***)
plug
> out of the top of the flywheel side (to check the timing) and then did the
> timing adj.  I had to pull the flywheel a couple of times and set it
right.
> Each time doing it only when cold.  It took a couple of days but I got it.
> It's not an easy job.

> --
> L8tr...
> Steve m...
> web page:  http://SportToday.org/~stevem52
> L.H. Club page:  http://SportToday.org/



> > Steve:

> > Question: In order to see the flywheel (magneto) you have to remove the
> > rewind coil housing. If you do this, you get no oil ... Where and how
did
> > you mark the flywheel to overcome this?

> > TS



> > > You'll need a dial gage to find TDC and mark the flywheel.  And then
use
> > the
> > > timing light to set the timing.  Remember this though.  The timing is
> > > affected by the temp and mine had to be set within the first 30
seconds
> of
> > > starting it cold.  I used a Inductive light from a car to do mine and
it
> > was
> > > fine.  (i had it checked at the dealer after i set it).

> > > --
> > > L8tr...
> > > Steve m...
> > > web page:  http://SportToday.org/~stevem52
> > > L.H. Club page:  http://SportToday.org/



> > > > Rotax 503 with CDI ... can I use a strobe to time it (I can't see
how)
> > or
> > > do
> > > > I have to get a dial gauge to find TDC?

> > > > TS

 
 
 

Rotax 503 ignition timing

Post by palmro.. » Sat, 11 Nov 2000 11:45:05

Perhaps ghostwriter can tell us EXACTLY what the letters TDC and BDC
stand for in his version of the definition of the two terms.

Sent via Deja.com http://www.deja.com/
Before you buy.

 
 
 

Rotax 503 ignition timing

Post by RDJ » Sat, 11 Nov 2000 13:11:39

TDC & BDC refer to the position of the piston in the cylinder, nothing else.
Top dead center and bottom dead center, what do you think it stands for? It
doesn't matter if it is a 4 cycle or a 2 cycle motor.

--
RDJ

www.geocities.com/Baja/Canyon/9150/


For Clarification:


Quote:
> ummm no,  TDC is the top of the compression stroke--BDC is the top of the
> exhaust stroke

In a four stroke engine

Quote:



> > TDC and BDC has nothing to do with 2-stroke or 4-stroke. 4-strokes hit
TDC
> > once on the exhaust stroke and once on the compression stroke. It simply
> > means what it says, the piston is all the way up or all the way down.

> > KR

 
 
 

Rotax 503 ignition timing

Post by KR » Sat, 11 Nov 2000 04:00:00

Thank you for backing me up Rob. :)

KR


Quote:
> Instead of marking the flywheel, I think you could mark the clutch.  And
> Ghostwheel, sorry but TDC stands for top dead center and BDC stands for
> bottom dead center.  TDC occurs when the piston is at the top of bore and
> connecting rod is moving at the crankshaft end only.  BDC is the same but
at
> the bottom of the stroke.  2 or 4 stroke has nothing to do with it.

> Rob



> > On my 87 Plus(521 engine) (which has the oil pump in between the
> cylinders),
> > I took off the recoil.  Put the Dial indicator in the sparkplug hole.
> Found
> > TDC and marked the flywheel (checked it and marked it, cause it already
> has
> > a line on it.. It's just not 100% accurate) and then figured where BDC
it
> > was looking for and marked it.  Then I ran the engine with the (***)
> plug
> > out of the top of the flywheel side (to check the timing) and then did
the
> > timing adj.  I had to pull the flywheel a couple of times and set it
> right.
> > Each time doing it only when cold.  It took a couple of days but I got
it.
> > It's not an easy job.

> > --
> > L8tr...
> > Steve m...
> > web page:  http://SportToday.org/~stevem52
> > L.H. Club page:  http://SportToday.org/



> > > Steve:

> > > Question: In order to see the flywheel (magneto) you have to remove
the
> > > rewind coil housing. If you do this, you get no oil ... Where and how
> did
> > > you mark the flywheel to overcome this?

> > > TS



> > > > You'll need a dial gage to find TDC and mark the flywheel.  And then
> use
> > > the
> > > > timing light to set the timing.  Remember this though.  The timing
is
> > > > affected by the temp and mine had to be set within the first 30
> seconds
> > of
> > > > starting it cold.  I used a Inductive light from a car to do mine
and
> it
> > > was
> > > > fine.  (i had it checked at the dealer after i set it).

> > > > --
> > > > L8tr...
> > > > Steve m...
> > > > web page:  http://SportToday.org/~stevem52
> > > > L.H. Club page:  http://SportToday.org/



> > > > > Rotax 503 with CDI ... can I use a strobe to time it (I can't see
> how)
> > > or
> > > > do
> > > > > I have to get a dial gauge to find TDC?

> > > > > TS

 
 
 

Rotax 503 ignition timing

Post by KR » Sat, 11 Nov 2000 04:00:00

TDC = Top Dead Centre

BDC = Bottom Dead Centre

KR

Quote:

> Perhaps ghostwriter can tell us EXACTLY what the letters TDC and BDC
> stand for in his version of the definition of the two terms.

> Sent via Deja.com http://www.deja.com/
> Before you buy.

 
 
 

Rotax 503 ignition timing

Post by Ghostwhee » Sat, 11 Nov 2000 04:00:00

I'ma havta disagree here...


Quote:
> Instead of marking the flywheel, I think you could mark the clutch.  And
> Ghostwheel, sorry but TDC stands for top dead center and BDC stands for
> bottom dead center.  TDC occurs when the piston is at the top of bore and
> connecting rod is moving at the crankshaft end only.  BDC is the same but
at
> the bottom of the stroke.  2 or 4 stroke has nothing to do with it.

> Rob



> > On my 87 Plus(521 engine) (which has the oil pump in between the
> cylinders),
> > I took off the recoil.  Put the Dial indicator in the sparkplug hole.
> Found
> > TDC and marked the flywheel (checked it and marked it, cause it already
> has
> > a line on it.. It's just not 100% accurate) and then figured where BDC
it
> > was looking for and marked it.  Then I ran the engine with the (***)
> plug
> > out of the top of the flywheel side (to check the timing) and then did
the
> > timing adj.  I had to pull the flywheel a couple of times and set it
> right.
> > Each time doing it only when cold.  It took a couple of days but I got
it.
> > It's not an easy job.

> > --
> > L8tr...
> > Steve m...
> > web page:  http://SportToday.org/~stevem52
> > L.H. Club page:  http://SportToday.org/



> > > Steve:

> > > Question: In order to see the flywheel (magneto) you have to remove
the
> > > rewind coil housing. If you do this, you get no oil ... Where and how
> did
> > > you mark the flywheel to overcome this?

> > > TS



> > > > You'll need a dial gage to find TDC and mark the flywheel.  And then
> use
> > > the
> > > > timing light to set the timing.  Remember this though.  The timing
is
> > > > affected by the temp and mine had to be set within the first 30
> seconds
> > of
> > > > starting it cold.  I used a Inductive light from a car to do mine
and
> it
> > > was
> > > > fine.  (i had it checked at the dealer after i set it).

> > > > --
> > > > L8tr...
> > > > Steve m...
> > > > web page:  http://SportToday.org/~stevem52
> > > > L.H. Club page:  http://SportToday.org/



> > > > > Rotax 503 with CDI ... can I use a strobe to time it (I can't see
> how)
> > > or
> > > > do
> > > > > I have to get a dial gauge to find TDC?

> > > > > TS