What Jet size? (installing 70cc big bore with pod filter)

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What Jet size? (installing 70cc big bore with pod filter)

Postby Dizzer » Thu Mar 31, 2011 9:15 pm

Hi

I'm In need of some advice
Not sure what size jets i should be choosing to start of with when installing a 70cc big bore kit, and pod filter with stock carb? Im most likely going to buy a few to get it right by trial and error.

Scooter is Yamaha Jog CV50 2006
Leo Vince TT exhaust, Daytona CDI, Prodigy variator.

Any help would be good, thanks.
Yamaha Jog CV50 2006, 70cc Kit, 21mm OKO Carb, large intake C/F Reeds, LV TT exhaust.
Honda Dio AF34E 2000 70cc kit, C/F reeds, Large intake, 19mm OKO carb, Doppler Filter
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Postby Hybrid » Fri Apr 01, 2011 7:44 am

105 something down to 95ish my jog is running a 95 but is standard apart from 68cc kit, when I installed the 95 it ran a bit rich, but I removed the little air filter snorkel and it came right. Are you based in Auckland? If so you can buy a few jet, to test and then return the unused one. But start rich, and see how it goes.

Ant
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Postby Dizzer » Fri Apr 01, 2011 3:16 pm

Thanks, Hybrid

I live in Wellington, so will have to ship a few down.
Im guessing these are the jets i should be getting from scootling?

http://shop.scootling.co.nz/index.php?a ... ductId=207
Yamaha Jog CV50 2006, 70cc Kit, 21mm OKO Carb, large intake C/F Reeds, LV TT exhaust.
Honda Dio AF34E 2000 70cc kit, C/F reeds, Large intake, 19mm OKO carb, Doppler Filter
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Postby Hybrid » Fri Apr 01, 2011 3:19 pm

they look right :)

Are you running the standard airbox?
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Postby Dizzer » Fri Apr 01, 2011 3:56 pm

Yeah im running the standard airbox, but may change to a pod filter, will see how it goes. I didn't need to re jet with the leo vince tt.

Hybrid, if you don't mind me asking what did you torque the cylinder head nuts at when you installed the Big bore kit?

Ive been trying to get my hands on a yamaha jog service manual but can't seem to find one anywhere online.
Last edited by Dizzer on Tue Apr 26, 2011 8:24 pm, edited 1 time in total.
Yamaha Jog CV50 2006, 70cc Kit, 21mm OKO Carb, large intake C/F Reeds, LV TT exhaust.
Honda Dio AF34E 2000 70cc kit, C/F reeds, Large intake, 19mm OKO carb, Doppler Filter
Dizzer
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Posts: 148
Joined: Tue Oct 26, 2010 1:22 pm
Location: Wellington

Postby Spearfysh » Sun Apr 03, 2011 10:45 pm

take the snorkel out of the air box, its part of the restriction jogs have. The pipe from the box to the carb is smallish to.

Some numbers you could find useful.

cylinder head 14Nm or 1.4kg-m
spark plug 20Nm or 2kg-m
air shroud 7Nm or 0.7kg-m
muffler to head 12nm or 1.2kg-m
muffler bracket 29Nm or 2.9 kg-m
big bolt holding top of engine to frame 84nm 0r 8.4kg-m
variator pulley 30Nm or 3kg-m
clutch bell 40Nm or 4 kg-m
rear wheel 104Nm or 10.4kg-m *** seems a bit high***
front axle 48Nm or 4.8kg-m
brake calliper 23Nm or 2.3kg-m
brake disk bolts 20Nm or 2kg-m (use locktite)
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Postby Hybrid » Mon Apr 04, 2011 10:05 am

Totalling...def remove the little snorkel.

I didn't torque the cylinder, I just did it up "tight" and then ran it for a while and then retighten it.

Not very hi-tech, but it worked.

Ant
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Postby Dizzer » Tue Apr 19, 2011 7:12 pm

Thanks, will have to remove the snorkel,

Did you adjust the oil pump at all when upgrading to the big bore on your Yamaha Jog? Wondering wether i need to turn any cables or tinker with anything to get more oil flowing.

cheers.
Yamaha Jog CV50 2006, 70cc Kit, 21mm OKO Carb, large intake C/F Reeds, LV TT exhaust.
Honda Dio AF34E 2000 70cc kit, C/F reeds, Large intake, 19mm OKO carb, Doppler Filter
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Postby Hybrid » Wed Apr 20, 2011 8:38 am

I tried to adjust the oil pump, but only managed a tiny bit.
I just put a bit of oil the petrol. Both my scooters get all their gas from two 20 litre containers in garage so it was pretty easy to add it.

I've been told that you can run Jogs fitted with some of the big bore kits on the standard oil pump. But I like the idea of a bit of oil in the fuel too, just peace of mind, I guess. :)
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Postby Spearfysh » Fri Apr 22, 2011 10:17 pm

7000kms on a big bore with just the std oil pump.
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