Yamaha jog help

[pothole]

Evening all, new person to the forum. My daughter has purchased a 2011 Yamaha jog rr that we planned to work on together ready for her 16th birthday. The bike had been stood for 3-4 years. It started when we looked but when we got it home and I tried to ride it there was no drive. We haven’t been able to start it since so this is a list of what we have done

Cleaned out the carb and replaced all fuel with fresh fuel.
Replaced the drive belt and rollers
Replaced gear oil
Replaced the electric starter and rely
Replaced the battery
New air filter

Bike still wouldn’t start and it had a kind of clattering sound when trying so I pulled the head and piston and soon discovered it needed a top end rebuild. Decided to opt for upgrading for a 70cc kit which included a new carb. Installed it all yesterday but it still won’t fire! It turns over but nothing. With the new carb on it doesn’t seem to draw any fuel down. I put the old carb on and I can see the fuel moving in the filter.
However with the old carb on it’s still not firing. I appreciate the carb will need setting up but surely it should still fire.
Any help would be appreciated

[aeroxbud]

I would try and get it running with the old carb first. Give it a good clean.
The more things you change, the harder it is to understand what's going on.
Try sucking on the vacuum line to get fuel to the carb. It should start then.
You will have to increase the jet size for the bigger bore. Usually between 5-10% Otherwise it can seize. Another good reason for sticking with a know base.
What big bore did you get? Some of the very cheap ones are very poor.

I had a jog RR. Great bike and quite nippy once upgraded.

[pothole]

With the old carb it’s definitely getting fuel to the carb as I can see it moving through the fuel filter.

[pothole]

When you say it can seize how do you mean.
It’s a kit I got from eBay

[bigmatthew86]

If it runs too lean it’ll be too hot & seize. A cheap Chinese kit aren’t usually worth spending the money on. Personally I’d have gotten a name brand kit & been done with it. Are you sure you’re getting spark?

[pothole]

Yes I definitely have spark but when cranking if I pull the plug after it’s dry

[aeroxbud]

Could be the reeds valve not sealing. It's between the carb and engine.
If it's leaking badly it will never seal enough to start.

[pothole]

There’s no obvious leaking I can see but unsure of the state of them inside

[geoffh]

And just to cross it off the list the arrow on the piston points to the exhaust port as i now know

Geoff

[pothole]

Yes it’s pointing towards the exhaust

[aeroxbud]

You need to remove the reeds to inspect them. There should be no light coming through the reeds when closed.

[repherence2]

Sounds like the float valve on the new carb is not working properly. That is just my deduction from what you have described. Old carb flows fuel. New carb does not flow fuel. Seems like float valve is not opening to allow fuel into the bowl. Is there a plug in the carb fuel inlet port?