BIG * scorpion pipe Tuning help!!!!!>>>pro help pleas!!!!

[Pancake808]

i have a 125cc dio with
ct mani
28mm oko carb
7:1 gears
keli variator
sef ramp
yellow clutch springs
cf clutch
1500k pully spring


i had a v8 yms stroker pipe which i had good tune on, ran great!!! and i put on a BIG scorpion pipe and now it doesnt have any pick up or top speed???? feels like a stock bike again???

i had 8g rollers ran the new pipe and it felt stock then i put 5g rollers and it felt worse???? what weights should i use????? guy i bought it from said to use lighter weights??? is that too light??? or should i go heavyier???

[Bear45-70]

Change the exhaust and you HAVE to rejet.

[Pancake808]

richer or leaner??? I had a 142 main and 52 pilot.~ then put a 148 main and hardly no improve ment??? *???

[Wheelman-111]

Greetings:

Which size Scorpion? Which size V8?

Assuming the new exhaust is Much Bigger, then the RPM where the engine "comes on the pipe" will go up.
At higher RPM, the air through the carb will increase. Those "great-running" jets sounded small to start with. I suspect the Pilot especially needs like 3- 4 sizes bigger to meet the new demand.
I ran 60/160 in a 28/30mm OKO with PG long at only 85cc, for example.

Also jumping from 48 to 30 grams is huge. Maybe you "overshot", perhaps by a lot.
Consider splitting the difference with 6.5s and see?

Finally, consider the possibility that the Scorpion is smaller, not bigger than that V8. If it was used, maybe a simple case of carbonization? That'd make it Act smaller too.

[Pancake808]

The v8 was the biggest v8 33mm inlet~ running 142main 52pilot max temp 288 wot was running perfect. I put on the scorpion pipe same 33mm inlet but huge all the to can looks like the pg big stroker pipe or maybe a little fatter.

[Wheelman-111]

Greetings:

So what are the CHTs with the Scorpion? Maybe it's just Too Big?

[Pancake808]

I bought pipes both new........

[Wheelman-111]

Greetings:

OK so which one you wannan sell me?

Seriously, post up rpm with 5 gram weights and temps you see. Maybe you get lucky and Baka-san decides to favor us with advice.

[Pancake808]

haha maybe the scorpion....... but i picked more rollers will try them later... chts??? whats that??? am i the only one with a big * pipe????

[Trafficjamz]

Does your scorpion look like this?

[Wheelman-111]

Greetings:

CHT = Cylinder Head Temps, sorry to get all. Technical on you.
You said you saw 288 with the V8. What were the temps with the Scorpion? How does the spark plug look? If it's pale, lighter than "cardboard", then jet up some more. Do try 6.5 = 39 grams.

[Pancake808]

YES THAT IS THE PIPE!!!!!!! I'M BEGINING TO THINK I NEED TO GET A BIGGER CARB FOR THAT PIPE

[Pancake808]

Bike dosent go past 30 mph .... wot ???

[bakaracer]

pull the plug and look at it. 288 temps is really low. you want to be around 325-360 at wot.put a new plug in since you have a new setup.make sure to check you plug gap too. I set mine at .024. up that pilot to a 55 also

[Pancake808]

i will up the pilot, the plug is new ngk ill double check it again.
any other tips????
what weights should i be running???
my> weight 220lbs
my cyl psi is@ 125

the shop owners set up is
big manifold/33 keihn carb/33g weights and his engine is 125cc ported. AND THE SCORP PIPE????

thanks again!!