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Best Premix Ratio

#1 User is offline   rs40paul 

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Posted 07 May 2017 - 01:50 PM

What is best oil for a ported 140 italkit and best ratio and I heard the pump is no got for big bore cylinder. Thanks for all my daffed questions and putting up with me.

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#2 User is offline   thedots 

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Posted 09 May 2017 - 08:37 PM

Well im using my maxima 959, staying in the band for like 30~90 mins and 40:1 so far no issues. Seized on 50~55ish

#3 User is offline   Kayla1 

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Posted 11 May 2017 - 02:45 PM

I use A747 at 20:1 in my Mitaka 140 track bike.

#4 User is offline   Mick183 

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Posted 12 May 2017 - 08:36 AM

I'd say 33:1 is a good happy medium for reliability and power.


40:1 is okay though, but I've still known people to have bottom end seizure at this ratio.


20:1 for out and out maximum power! but you'll need some richer jets and then it gets expensive with all that extra fuel and oil you start going through.


Just to state I am using Silkolene ProKr2 Castor oil in mine, premixed at 33:1

This post has been edited by Mick183: 12 May 2017 - 08:38 AM


#5 User is offline   Kayla1 

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Posted 12 May 2017 - 10:02 AM

View PostMick183, on 12 May 2017 - 08:36 AM, said:

gets expensive


It's cheaper than the alternative! :thumbsup:

20:1 is rubbish on a road bike though, so 33:1 would be a good balance.

This post has been edited by Kayla1: 12 May 2017 - 10:03 AM


#6 User is offline   Mick183 

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Posted 13 May 2017 - 08:58 PM

Too true!! :thumbsup: :thumbsup:

How is the bike on 20:1 then? I'm guessing you have to thrash the engine pretty hard to stop it fouling/bogging then?

Good on you fellow castor oil burner!!! :) I've never used A747 though, never been able to really get hold of it


I've never run anything lower than 33:1 personally, but I've heard of various racers and engine tuners saying 20:1 is great for getting good power out the engines

This post has been edited by Mick183: 13 May 2017 - 09:00 PM


#7 User is offline   Kayla1 

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Posted 20 May 2017 - 03:35 AM

It's my track bike and only gets used on track so it does get a bit of stick. Waiting in the queue to go out with no kick or electric start can be a little fraught sometimes...

#8 User is offline   Mick183 

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Posted 20 May 2017 - 02:13 PM

why no electric start? Did you remove the starter motor?

#9 User is offline   sobriety 

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Posted 20 May 2017 - 06:02 PM

Quote

why no electric start?


Weight I'd guess, no battery, no starter motor. That's a good chunk of weight on an RS.

This post has been edited by sobriety: 20 May 2017 - 06:03 PM


#10 User is offline   Mick183 

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Posted 21 May 2017 - 11:02 PM

can it be converted to kick start?

#11 User is offline   sobriety 

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Posted 22 May 2017 - 09:07 AM

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can it be converted to kick start?


Yes, the crankcase has the points to fit it, you'd need to machine out the blank cast in hole for the shaft too.

The real issue is that the kickstart parts are pretty much impossible to find, very few of the bikes had them (it was the SP only). The off road bikes all have kickstarts, but the shafts are different lengths, so not interchangable.

#12 User is offline   rs40paul 

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Posted 22 May 2017 - 10:30 AM

 Kayla1, on 20 May 2017 - 03:35 AM, said:

It's my track bike and only gets used on track so it does get a bit of stick. Waiting in the queue to go out with no kick or electric start can be a little fraught sometimes...


#13 User is offline   rs40paul 

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Posted 22 May 2017 - 10:35 AM

Alright everyone am i wright in thinking if i went more oil bigger jets for a ported 140 with new jolly sp and new 34 flat side i have motul800 and pump blanking plate, bike is for road not track. Thanks in advance Paul uk

#14 User is offline   Kayla1 

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Posted 24 May 2017 - 07:38 AM

View PostMick183, on 21 May 2017 - 11:02 PM, said:

can it be converted to kick start?


It's actually got a kick start bottom end from an RX but the splined shaft is too short to clear the RS frame so the kick start lever is no use. I think the ETX shaft is the same as the SP one, but the idler gear part numbers are different from the RX so it might end up turning into an expensive PITA. The bike was originally a race bike and came with no e-starter stuff fitted anyway so I've sort of got used to it. Still a pain though :roflmao:

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