Pocketbike jetting.

**Nutter34** · 26th May 2010, 22:36

How sensitive are these to jetting?

I have the a115/cag/daytona/trademe special.

What's the best way to determine jetting? Run at max and kill it? Check plug? Biscuit brown colour? I know to start with the main, then sort the needle etc afterwards.

Do you guys change jetting from summer to winter?

I ask since we are curious about the effects of temperature. We currently 'play' at night when it's between zero and 10 degrees C...

**CookMySock** · 27th May 2010, 09:47

For general running they are relatively insensitive - they will always "go". If you to boogie, jet them as lean as you dare for maximum performance, or else they run rich and shitty and won't rev right out. Most people won't though. They will get scared and run them rich for "maximum power" and so they don't "blow an engine".

Steve

**White trash** · 27th May 2010, 09:57

Engine rebuild's what, 30 bucks?

Lean it out, lean it out, then lean it out some more till it goes bang then pop a new pistone in it and back it off a little. Job done.

**Nutter34** · 27th May 2010, 12:38

Lol, WT, fair enough too.

Thanks for the replies lads.

We did a chop on one of the bikes the other night and it was light grey, so getting up there already.

PS: How long do you guys run at full throttle to do a plug chop. I think I've heard someone say 25 seconds.

Thanks.

**White trash** · 27th May 2010, 16:02

Mt Wellington isn't long enough to run for 25 seconds full noise so I wouln't know. Maybe 15 max.

**imdying** · 27th May 2010, 16:05

Stopwatch and a pile of jets. Find the one that whips down 100 metres from a standing start the fastest, and then balance that against the one you feel gives you the best low down poke. 5 needle clip settings to make it a bit more fun

Winter = colder air = denser air = leans you out, so you might want a little richer compared to Summer.

**888mike** · 27th May 2010, 16:09

Shit you guys are gettin serious

**Nutter34** · 27th May 2010, 18:24

Originally Posted by 888mike

Shit you guys are gettin serious

Not really...

It's a few minutes to swap a jet. Considering we ride at night and it's pretty close to zero degrees C, I'm willing to play a bit to get the jetting right...

Mmm, gonna have to source a pile of jets, lol.

**Junkers** · 28th May 2010, 01:10

Be careful with that float arrangement, these things love to leak. I've heard you can drill the throat of the carb out as well.. food for thought.

**CookMySock** · 28th May 2010, 08:23

Originally Posted by Nutter34

we ride at night and it's pretty close to zero degrees C

Fark that.. and we shiver through our 11 degree days.. I guess theres no cold wind inside though.

Steve

**Nutter34** · 28th May 2010, 12:33

Lol, we ride outside. It was 6 last night.

Did one plug chop, bike burning grey on the plug. May just leave it.

Man, it gets up to speed real quick though, lol.

**{.bLanK}G_o_D** · 28th May 2010, 13:34

We have an ass load of carbs to jet, so what I did was I brought a high quality "true" pin chuck for $80 from Gorge Henry (chuck to hold tiny drill bits) and a few different sized drill bits. 0.6 and 0.7 for a start.
Solder the hole in the jet and then drill it out using a tight drill press.

**imdying** · 28th May 2010, 13:41

Yep, once we're sure of the direction to head, we'll get some genuine ones... well except for the cag ones, drilling will probably have to suffice unless someone knows where to buy them?

**CookMySock** · 28th May 2010, 13:45

Originally Posted by Nutter34

Lol, we ride outside. It was 6 last night.

Is there no politics with noise etc? A few club members here (glares at Mike) are afrraaaaaid to ride at night coz we might kick up a storm.

Anyway, we might get cold hands at night, and the girls hate that.

Steve

**Nutter34** · 28th May 2010, 13:45

Originally Posted by {.bLanK}G_o_D

We have an ass load of carbs to jet, so what I did was I brought a high quality "true" pin chuck for $80 from Gorge Henry (chuck to hold tiny drill bits) and a few different sized drill bits. 0.6 and 0.7 for a start.
Solder the hole in the jet and then drill it out using a tight drill press.

Yeah, we were wondering what size they'd be. One guy was thinking just that...

Originally Posted by imdying

Yep, once we're sure of the direction to head, we'll get some genuine ones... well except for the cag ones, drilling will probably have to suffice unless someone knows where to buy them?

I thought Newmanz had a jet set...

Originally Posted by DangerousBastard

Is there no politics with noise etc? A few club members here (glares at Mike) are afrraaaaaid to ride at night coz we might kick up a storm.

Anyway, we might get cold hands at night, and the girls hate that.

Steve

We aren't riding in the suburbs. Lets just say we're far enough from everything for it not to be an issue (we think) and it is 'private property'...