Dellorto SHA 15:15 Jet Question

I have rebuilt an engine and installed it but can't get it to start up.

Here's what's new:

70cc TCCD kit

High comp head

new spark plug

super stuffy crank

case matched

new bearings and seals

stuff i already had:

dellorto SHA 15:15 carb

techno bullet pipe

I have a good spark. reset the point gap, and plug gap. cleaned points. I re-cleaned by tank, carb and replaced fuel filter. So i'm pretty sure i have good fuel and air delivery.

So i'm thinking my issue is the main jet size. The motor wants to fire. I'll get a pop or sputter every now and then. I bought a range of jets but they aren't the right ones. i need the bigger thread ones. the current jet does not have any markings so i can't identify the size. Any advice on a good range to start at?

Re: Dellorto SHA 15:15 Jet Question

70's

Re: Dellorto SHA 15:15 Jet Question

Do you think jet size is my issue with the no start?

Re: Dellorto SHA 15:15 Jet Question

Yeah,start with jet in the 70s and work down if rich.

Re: Dellorto SHA 15:15 Jet Question

Dirty30 Dillon /

If you don't know the jet size, how can you even start to think that it is tuned??

Re: Dellorto SHA 15:15 Jet Question

> Dirty30 Dillon Wrote:

> -------------------------------------------------------

> If you don't know the jet size, how can you even start to think that it

> is tuned??

If I cant get it started can I even start to get it tuned?

Re: Dellorto SHA 15:15 Jet Question

Brandon Weiss (Detective brandon to you) /

> Triflin Milton Wrote:

> -------------------------------------------------------

> > Dirty30 Dillon Wrote:

>

> > -------------------------------------------------------

>

> > If you don't know the jet size, how can you even start to think that

> it

>

> > is tuned??

>

> If I cant get it started can I even start to get it tuned?

The SHA is a single jet carb one of the easiest to tune. Aside from slides, you just have 1 jet to change. Too lean (won't start)? Upjet. Too rich? Downjet.

If it won't start, you need to establish a baseline to start with. Based on your setup, i would start with a low 80's jet, and work your way down into the high-mid 70's until it runs good. You said your jet does not have a marking on it, which leads me to believe you have a clone SHA, which work fine for the most part. You need to order 5mm Dellorto jets. Get them at treatland, or doscycles, mopeddivision... Get a temp gauge, it will help. And a few extra spark plugs.

Also, have you verified that your timing is correct with a timing light?(edited)

Re: Dellorto SHA 15:15 Jet Question

> Brandon Weiss (Detective brandon to you) Wrote:

> -------------------------------------------------------

> The SHA is a single jet carb one of the easiest to tune. Aside from

> slides, you just have 1 jet to change. Too lean (won't start)? Upjet.

> Too rich? Downjet.

>

> If it won't start, you need to establish a baseline to start with. Based

> on your setup, i would start with a low 80's jet, and work your way down

> into the high-mid 70's until it runs good. You said your jet does not

> have a marking on it, which leads me to believe you have a clone SHA,

> which work fine for the most part. You need to order 5mm Dellorto jets.

> Get them at treatland, or doscycles, mopeddivision... Get a temp gauge,

> it will help. And a few extra spark plugs

This is the kind of info I was looking for. Thanks so much! And I already have a temp gauge. I've spend too much time and money to seaze on my first ride.

Re: Dellorto SHA 15:15 Jet Question

Brandon Weiss (Detective brandon to you) /

> Triflin Milton Wrote:

> -------------------------------------------------------

> > Brandon Weiss (Detective brandon to you) Wrote:

>

> > -------------------------------------------------------

>

> > The SHA is a single jet carb one of the easiest to tune. Aside from

>

> > slides, you just have 1 jet to change. Too lean (won't start)? Upjet.

>

> > Too rich? Downjet.

>

> >

>

> > If it won't start, you need to establish a baseline to start with.

> Based

>

> > on your setup, i would start with a low 80's jet, and work your way

> down

>

> > into the high-mid 70's until it runs good. You said your jet does not

>

> > have a marking on it, which leads me to believe you have a clone SHA,

>

> > which work fine for the most part. You need to order 5mm Dellorto

> jets.

>

> > Get them at treatland, or doscycles, mopeddivision... Get a temp

> gauge,

>

> > it will help. And a few extra spark plugs

>

> This is the kind of info I was looking for. Thanks so much! And I

> already have a temp gauge. I've spend too much time and money to seaze

> on my first ride.

You'll want to verify your timing is correct too with a timing light, and ensure you have no vacuum/air leaks. SHA are prone to leaking at the mounting point, an O ring typically solves it.

With the clone SHA, just be a little more careful tightening the screws, as the metal/plastic may be of lesser quality. Post a picture of it if you can.

Re: Dellorto SHA 15:15 Jet Question

After ordering a range at treatland I found some jets that will work at my local scooter shop. Go figure. Also, I assume I have a cloned dellorto. Betcha can't identify this!

20190319_131724.jpg

Re: Dellorto SHA 15:15 Jet Question

Brandon Weiss (Detective brandon to you) /

looks like some threads got pulled out?

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