tuning 28oko and pg long

[TikiMan]

Hey, so im out riding my 81cc kit from taz with a 28oko and a pg long. I'm running a 55 pilot and a 165 main. I can't keep the scoot from running between 275and350 degrees. Is this normal? I've checked the plug and it looks correct. I also checked for an air leak and couldn't find one. So I'm wondering if my jetting is off?

[paulpauly7]

those temps are good

[Red Eft Performance]

those temps are good. For my area those jets are big.

[TikiMan]

I did some riding tonight about an hr and a half cruise temps reached 390-400 with the choke in some spots due to the cold air. Im in Chicago suburbs so weather changes daily. Ive been switching main jets between 162-168 and the a 58 pilot some days. Runs like a beast cruising 60mph plus on longer straights. But the 400 temp is what scares me. Im running the stock plug should I be switching to the extended high speed plug?

[Red Eft Performance]

I did some riding tonight about an hr and a half cruise temps reached 390-400 with the choke in some spots due to the cold air. Im in Chicago suburbs so weather changes daily. Ive been switching main jets between 162-168 and the a 58 pilot some days. Runs like a beast cruising 60mph plus on longer straights. But the 400 temp is what scares me. Im running the stock plug should I be switching to the extended high speed plug?

Running one step colder plug is suggested. Im a little concerned you might have an air leak ive built a very similar motor and the jets your running are big. And im at sea level. Maybe someone else will chime in and confirm that.

[Trafficjamz]

check the compression it could be too high and cause high temp spikes.

The main jet numbers sound way too big.

[maddog]

I have never heard of an 81cc bore kit= to large for a mini stroker and to small for a full stroker? if its a cheap taiwan kit i would go with a ngk-9 plug.

[TikiMan]

Its a 50mm kit from taz. I did a compression check and I'm at 140psi. Did a leak down and nothing seemed wrong. Reeds seem to have a tiny leak. It has been addressed same temps. I switched to a 162 main. It has way more pull and extra top end. But same temps. Got it up to 390 after a mile flat out.

[LMH]

Be careful continually running that temp, you also have to add in at least 5% for loss in constant cooling from the fan. Eventually its going to melt something.
How does the temp send unit look also? Is it oily at all? I found a trailtech send unit to allow an airleak after some time, I only realized it was leaking after the fact, but it was covered in oil. It burnt a hole in a very expensive piston. It seems that usually if everyone else is running the same jetting and you have a huge jump, theres an issue.
Just my 2 cents and I hope you get it figured out!

[TikiMan]

Im running the 10mm ring around one of the studs. Im at a loss of what to look for. So I will be swapping plugs soon and seeing what that does.

[deuce217]

I have a 50mm BBK on my elite and run about a 140-145 Main. I am at around 1200 feet of elevation where I live.

[LMH]

With those temps at a head stud my friend your well above 400. Theres gotta be an air leak.

[TikiMan]

Ill be checking again tomorrow in the morning. If it was an aluminum kit I would expect to see higher temps and the ability to withstand the heat. So back on the lift to see whats happening.

[TikiMan]

How much pressure should I be sending into the motor for the leakdown test? I have a regulator valve on my tool and I can push up to 200 psi. I know thats way more than needed. Should I be matching my compression or running a little less into the motor? Thanks guys. Ill try and get some pics uploaded.

[paulpauly7]

no more that 6 or 7psi anymore and you will blow out the oilseals