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Jetting following reed valve- expected increase, but really!
Posted: Tue Mar 10, 2015 10:59 pm
by alanscottj
My scoot was dynoed by Readspeed and was running a 108 main (muggy 198), power jet was always closed, recently fitted reed valve and was expecting to up jet as recommended. Tonight, I have managed to up jet to a 118 with power jet open 3/4 a turn. Scoot is running fantastic, nippy low down as before, sits nice at 65. I'm not looking for a problem but does this sound quite a large up jet? Or is it about right? (Plug chops to be done tomorrow)
Re: Jetting following reed valve- expected increase, but rea
Posted: Tue Mar 10, 2015 11:54 pm
by Speed Demon
Yes, expect a massive upjet on reed.
Re: Jetting following reed valve- expected increase, but rea
Posted: Tue Mar 10, 2015 11:57 pm
by alanscottj
Speed Demon wrote:Yes, expect a massive upjet on reed.
So that's my main up jetted, will my needle/atomiser etc need changing too?
Re: Jetting following reed valve- expected increase, but rea
Posted: Wed Mar 11, 2015 1:41 am
by coaster
The dyno is the best place to get it set up but found that it was the main and needle position that needed changing on my Indian 225 when I fitted an MB reed block to it with holes in the piston and a finger port added. I believe it is compensation for poor airflow as the revs rise or somesuch
Re: Jetting following reed valve- expected increase, but rea
Posted: Sat Mar 14, 2015 3:13 pm
by alanscottj
Main jet has been increased from a 108 up to a 122, PowerJet is 3/4 open and still no sign of getting boggy at wot. Plug is still a light shade of chocolate. Going to borrow some bigger main jets off a mate and see what is the biggest I can get it to then work back down.
Re: Jetting following reed valve- expected increase, but rea
Posted: Sat Mar 14, 2015 8:37 pm
by alanscottj
Up to 128 main now! Plug is looking nice though
Re: Jetting following reed valve- expected increase, but rea
Posted: Sat Mar 14, 2015 9:11 pm
by Norrie Bodge
alanscottj wrote:Up to 128 main now! Plug is looking nice though
Ordered my new 30mm PHBH with 125main for starters
Should be here Monday
What you got timing set at Alan?
Re: Jetting following reed valve- expected increase, but rea
Posted: Sat Mar 14, 2015 9:39 pm
by alanscottj
Norrie Bodge wrote:alanscottj wrote:Up to 128 main now! Plug is looking nice though
Ordered my new 30mm PHBH with 125main for starters
Should be here Monday
What you got timing set at Alan?
Honestly can't remember mate, pete at PSL set it last time I had scoot dynoed, 17 or 18 rings a bell ?
Re: Jetting following reed valve- expected increase, but rea
Posted: Sat Mar 14, 2015 10:30 pm
by Norrie Bodge
alanscottj wrote:Norrie Bodge wrote:alanscottj wrote:Up to 128 main now! Plug is looking nice though
Ordered my new 30mm PHBH with 125main for starters
Should be here Monday
What you got timing set at Alan?
Honestly can't remember mate, pete at PSL set it last time I had scoot dynoed, 17 or 18 rings a bell ?
Ok cheers m8
I've set mine at 18 ill see how it goes