Curious as to those who have drilled out the enrichment hole .018”. I purchase some #77-- .018” drill bits from eBay 10 of them for 3.99. I know cheap! I measured all the bits and they varied from .0165” to .0175”. The bit went right through the hole. SOOOOOOOOO what does this mean?
The hole was already at .018 or the bits are off a .001 or so?????
Does anybody know what size the hole is BEFORE the drilling? I mean if it’s .017” I’d understand but if it’s say .012, I think it was already drilled properly from the factory at .017”.
What to do???????
Leave it alone or ???
My bike was hard to start when it was 45 degrees or so, took several attempts but it did start. This is why I wanted to drill the enrichment hole.—Yes I’m sure it the right hole :-) and I zeroed out the mic.

Thanks!!

 

Yeah, the stock opening of the starter jet only has to be opened up a very small amount. I'm the one who came up with this method for addressing cold start, but it's been so long ago that I can't remember what drill bit size the OEM opening was. It was not much smaller than the recommended .018" bit. You might think this doesn't make much difference, but it makes tons of difference. In fact if you go bigger than .018" you won't be able to leave the choke on for more than a couple of seconds after it fires up in most cases.

 

A 5/32 drill bit fit just right in my stock carb. Drill bit measured [sp] .156. I got my bike used with jet kit and FMF so don't know if it is stock or not? Big help, eh.

 

I think you have the wrong hole... they are speaking about the fuel enriching jet/choke.

 

Thanks to all for your input.

I am going to order more .018" bits, they are cheap enough. I'm going to try different companies, measure them and use the one closest to .018". If it works fine it not I'll leave it alone. Since I'm jetting also using a Dynojet 2206 kit maybe it will help with the starting.

Thanks

Stashu

 

.018 is .018... you may just want to order one good bit from a machine supplies company if the bits you have are varying that much. When I used to run lathe a lot you had to drill typical holes to be reamed at 1/64-1/32 under, because the bit tends to over cut due to wobble; however this hole is tiny and being done by hand so its not going to happen lol. I wonder if they make reamers this small... that would be perfect!

 

I've heard of jet reamers on another forum.

Besides a machining shop, maybe check a hobby shop for bits.

 

I have a set of jet reamers. That's what I used on mine...

Ron

 

lol I am not good with the .00 stuff. And I was on the wrong end of carb. Near as I can tell mine is .018+- . The other hole .054. Carb is in a box any way so I don't care too much just trying to add my .0002.