Drilling into crank shaft - bad idea?

[locky]

I've got a crank shaft but it's a bump start version and I want to convert it to pull start, but there is no hole in the end for the pin of the pull starter to locate. So I want to drill a small hole in the crank part. I will use a pillar drill to get it straight.

 

Any advice on metal drilling or should I leave it alone?

 

 

[Nitroholic]

Considering the revs these spin at, accuracy would be my first concern. Even with a pillar drill

 

My next concern would be the hardness of the metal...and what drillbit

 

Lastly would be the issue of crankshaft balance.

 

Personally...I'd leave it alone. Depends if you can afford to get it wrong

[TMaxxDave]

Id leave it alone. Drilling it out will upset the balance. But then again its only a single cylinder so it may not effect it that much but it does let go at 30000rpm its gonna be messy for a little engine

Sent from my Galaxy S5 Neo

[m1tch_87]

Might be easier to try and find the pull start version of the engine and buy a crank etc, or perhaps sell it and buy a pull start version.