Engine won't rev all the way while riding

[Soflowrider]

65 works for me. I don't think that is the problem. Shorten that gear already. 39, 40, 41 if you need speed.

Ok il give that a try.

 

[HeadSmess]

36t is good for a 26" wheel, no real need to get smaller. bigger is better for hilly areas.

jetting is up to altitude, fuel, engine tune... do some research, plug chops, and good old "this revs up without fourstroking and makes more power than..." tests.

start small, get bigger until it starts fourstroking and then go back one.
use ngk b(r)5hs or similar, get a decent reading on the plug.

dont run more oil than 25:1. ie, between 30:1, 50:1, ok,

20:1, 16:1...waste of oil, dirty, and less power.

and some engines are just junk and never want to get up and boogie.

 

[butre]

65 works for me. I don't think that is the problem. Shorten that gear already. 39, 40, 41 if you need speed.

what jet works for you isn't what will work for other people. different modifications and different density altitude will require different jets

 

[Timbone]

Stock jet on a HT 2 stroke is a 70. Never had one that wouldn't 4 stroke at WOT with that jet. 65 is a good place to start. All this is just suggestion. YMMV, of course.

 

[Steve Best]

Your engine is not reving up enough to make max power.
All the advice given here looks good.

I'm running a 70 jet, 44t stock gear and doing 35-38mph dependent on conditions.
My speed is pretty much rpm limited at this point and is turning much higher rpm than OP.
I did lower the float level slightly, as Timbone notes, NT carb is rich from the factory.
Cooler weather and higher altitude it may still be the jet for you.

You tach sounds wonky. Only 2700 rpm at 33mph does not make sense even with a 30T sprocket.
Wow. 30T sprocket. Acceleration and low speed must be terrible! 33mph is very respectable.
I agree with other posters to try a taller sprocket. You will probably like it better and see more speed.

Steve

 

[butre]

Stock jet on a HT 2 stroke is a 70. Never had one that wouldn't 4 stroke at WOT with that jet. 65 is a good place to start. All this is just suggestion. YMMV, of course.

at my altitude they tend to run lean at 65. somewhere between a 66 and a 68 is required.

 

[Soflowrider]

Just swapped back

at my altitude they tend to run lean at 65. somewhere between a 66 and a 68 is required.

I'm at sea level still working on jetting, currently running 65 main jet my friend has luck with the 60 so I'm going to try that next and see. changed my sprocket back the 44t and it gets up and goes now 35mph @ WOT still trying to squeeze a little more out of it.

 

[butre]

Just swapped back


I'm at sea level still working on jetting, currently running 65 main jet my friend has luck with the 60 so I'm going to try that next and see. changed my sprocket back the 44t and it gets up and goes now 35mph @ WOT still trying to squeeze a little more out of it.

a 60 isn't likely to do good for you at sea level. do a plug chop, don't just rely on what your friends tell you works.

find out what the typical density altitude in your area is and I can give you a good baseline.

 

[Soflowrider]

a 60 isn't likely to do good for you at sea level. do a plug chop, don't just rely on what your friends tell you works.

find out what the typical density altitude in your area is and I can give you a good baseline.

What is found the density altitude is somewhere between 2250'-2110'

 

[butre]

What is found the density altitude is somewhere between 2250'-2110'

yeah, start at a 63 and go richer from there.

do actual plug chops.

around here our da can be as low as -1500 or even -2000 ft during the winter and as high as 2500 during the summer.

that can easily be a 10% difference in power