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Author Topic: PJ38 jetting  (Read 648 times)

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PJ38 jetting
« on: August 15, 2013, 06:22:44 pm »
Where to start? I'm a complete idiot when it comes to jetting,,, i know how to run a plug chop to check main and thats about it,,, but i have no idea where to start on things.

The fats:

265
PSI pipe, DG silencer
Airbox w/o lid
some crazy porting; used to be an ice bike and was raced with this cylinder so i would assume its ported for ice track
stock intake
stock reeds (i believe)

102ft above sea level

the skinny,

quad vent PJ38.

Like I said, i have NO IDEA WHAT IM DOING WITH JETTING. And dont want to trash my last bore cylinder,,,, so please help a brotha out?? lol Thank you!!

 D?
- Cj
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Re: PJ38 jetting
« Reply #1 on: August 15, 2013, 06:24:57 pm »
55-58 pilot and 152-160 main
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Re: PJ38 jetting
« Reply #2 on: August 15, 2013, 07:00:58 pm »
Quote from: 2smoker on August 15, 2013, 06:24:57 pm
55-58 pilot and 152-160 main

what about air screw?

and should i have the idel/choke closed all the way and then turn it up until it idles on its own?
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1976 Yamaha TT500
1979 Yamaha TT500
1980 Yamaha TT500
1985 Yamaha YTZ250
1985 Yamaha YTZ250
1985 Honda ATC350X
1985.5 Yamaha YTZ250
1987 Suzuki LT265R
1988 Suzuki LT250R
2002 Honda CR85RB
2005 Honda TRX450R
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Re: PJ38 jetting
« Reply #3 on: August 16, 2013, 02:27:01 am »
I would try 178  main 58 to 60 pilot. Air screw 2 turns out. What size needle do you have. Is it  a dgh dgl dgk .
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: PJ38 jetting
« Reply #4 on: August 16, 2013, 04:12:09 am »
No clue about the needle. How do I tell what it is? I tried looking on it this morning to see if it was marked what it was but I couldn't see anything
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1976 Yamaha TT500
1979 Yamaha TT500
1980 Yamaha TT500
1985 Yamaha YTZ250
1985 Yamaha YTZ250
1985 Honda ATC350X
1985.5 Yamaha YTZ250
1987 Suzuki LT265R
1988 Suzuki LT250R
2002 Honda CR85RB
2005 Honda TRX450R
2007 Honda TRX450ER

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Re: PJ38 jetting
« Reply #5 on: August 16, 2013, 10:28:27 am »
Yea it is at the top of the needle. Needle size has alot to do with wat pilot you run. With pj carb
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: PJ38 jetting
« Reply #6 on: August 16, 2013, 10:55:38 am »
Oh ok. I'll look again when I get home. Hopefully I can find it.
Pretty sure this carb has never been ran on anything. The jets that were in it were so retarded. The pilot was SUPER fat and the main SUPER lean. I'll find them and post what they were
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1976 Yamaha TT500
1979 Yamaha TT500
1980 Yamaha TT500
1985 Yamaha YTZ250
1985 Yamaha YTZ250
1985 Honda ATC350X
1985.5 Yamaha YTZ250
1987 Suzuki LT265R
1988 Suzuki LT250R
2002 Honda CR85RB
2005 Honda TRX450R
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Re: PJ38 jetting
« Reply #7 on: August 16, 2013, 11:54:07 am »
=well I was going to tell you what pm PJ39.5 were jetted at but i see you have 250/265 and I have 500 at 5000 foot elivation, so it would be meaningless.
  For what its worth I run a 168 to 175 ish mains.
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Re: PJ38 jetting
« Reply #8 on: August 16, 2013, 02:49:48 pm »
Ok there are no letters on the needle,,,,,

What needle SHOULD I get?

And where's the best place to buy a jet kit from?
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1976 Yamaha TT500
1979 Yamaha TT500
1980 Yamaha TT500
1985 Yamaha YTZ250
1985 Yamaha YTZ250
1985 Honda ATC350X
1985.5 Yamaha YTZ250
1987 Suzuki LT265R
1988 Suzuki LT250R
2002 Honda CR85RB
2005 Honda TRX450R
2007 Honda TRX450ER

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Re: PJ38 jetting
« Reply #9 on: August 18, 2013, 09:25:16 pm »
Bump,,,

I do greatly appreciate the help.
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1976 Yamaha TT500
1979 Yamaha TT500
1980 Yamaha TT500
1985 Yamaha YTZ250
1985 Yamaha YTZ250
1985 Honda ATC350X
1985.5 Yamaha YTZ250
1987 Suzuki LT265R
1988 Suzuki LT250R
2002 Honda CR85RB
2005 Honda TRX450R
2007 Honda TRX450ER

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Re: PJ38 jetting
« Reply #10 on: August 18, 2013, 09:46:13 pm »
I have the dgh needle in my carb. your local dealer should be able to get the jets or maybe have them in stock. or try rockymountainatv.com.
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Re: PJ38 jetting
« Reply #11 on: August 19, 2013, 04:47:14 am »
Let me look later at mine and I will tell you sometime today.
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: PJ38 jetting
« Reply #12 on: August 19, 2013, 06:23:03 am »
Thanks a ton Smoke an LT250RWV!!

WV, you're running the same carb?
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1976 Yamaha TT500
1979 Yamaha TT500
1980 Yamaha TT500
1985 Yamaha YTZ250
1985 Yamaha YTZ250
1985 Honda ATC350X
1985.5 Yamaha YTZ250
1987 Suzuki LT265R
1988 Suzuki LT250R
2002 Honda CR85RB
2005 Honda TRX450R
2007 Honda TRX450ER
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