3 replies to this topic

[tonyp]

Hi,

I've recently got a Bultaco 198A. I believe the ignition timing is between 2.8mm and 3.0mm BTDC.

I haven't yet got a TDC Tool, but I guess I'll need one.
- are the standard tools OK, or do I really need a micrometer version ?

But I was wondering...
- what's this measurement in terms of degrees BTDC ?
- I can't imagine being able to measure 2.8mm to 3mm with any great accuracy, so isn't it easier/better to measure in degrees ?

Tony P

[copemech]

tonyp, on 25 January 2012 - 11:07 PM, said:

Hi,

I've recently got a Bultaco 198A. I believe the ignition timing is between 2.8mm and 3.0mm BTDC.

I haven't yet got a TDC Tool, but I guess I'll need one.
- are the standard tools OK, or do I really need a micrometer version ?

But I was wondering...
- what's this measurement in terms of degrees BTDC ?
- I can't imagine being able to measure 2.8mm to 3mm with any great accuracy, so isn't it easier/better to measure in degrees ?

Tony P

No, if you do not have the good tool to begin with, you will never align a degree wheel. A vernier type works, dut a dial indicator is better!

[Monty_Jon]

copemech, on 26 January 2012 - 03:44 AM, said:

No, if you do not have the good tool to begin with, you will never align a degree wheel. A vernier type works, dut a dial indicator is better!

As above, its worth investing in a good quality dial gauge

[wayne_weedon]

2.8mm trigs out to 5.62 deg