Got my Bill Blue 331 kit
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Joined: Oct 2006
Posts: 3,106
From: Misawa Japan
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RE: Got my Bill Blue 331 kit
Ok, that makes sense becuase Thump racing usesa lower profile Wiseco pistion wheras Kustom craft uses a slightly higherprofile JE piston.
ORIGINAL: Finger Mullet
Edit: The Thumper Racing 340 setup is supposed to be 10.5:1 they said they tried several different compressions and 10.5 worked best. I got thumper and Kustom Kraft mixed up .... don't know about Kustom
ORIGINAL: tremor38
Pretty reasonable.
I would recommend using premium fuel unless Bill can tell you exactly what the compressioin ratio is now. I know the kits people are buying from Kustom-kraft are up around 12:1. I you are using the JE brand piston, the comp ratio is probably the same as the KK kit. The only way to get the it lowered back to stockvalue is to have some combustion chamber work done.
Pretty reasonable.
I would recommend using premium fuel unless Bill can tell you exactly what the compressioin ratio is now. I know the kits people are buying from Kustom-kraft are up around 12:1. I you are using the JE brand piston, the comp ratio is probably the same as the KK kit. The only way to get the it lowered back to stockvalue is to have some combustion chamber work done.
Edit: The Thumper Racing 340 setup is supposed to be 10.5:1 they said they tried several different compressions and 10.5 worked best. I got thumper and Kustom Kraft mixed up .... don't know about Kustom
Senior Member
Joined: Oct 2006
Posts: 3,106
From: Misawa Japan
1st Gear Member
RE: Got my Bill Blue 331 kit
Naw, it's the LA Sleeve wet sleeve.
ORIGINAL: Finger Mullet
Is that a Thumper Racing sleeve? Wouldn't it be 340cc then? I thought the 331 Kustom Kraft was a bored 300 cyclinder and then nikacel plated.
Is that a Thumper Racing sleeve? Wouldn't it be 340cc then? I thought the 331 Kustom Kraft was a bored 300 cyclinder and then nikacel plated.
Senior Member
Joined: Oct 2006
Posts: 3,106
From: Misawa Japan
1st Gear Member
RE: Got my Bill Blue 331 kit
Naw, the kit came from LA Sleeve, but they make only the sleeve. They don't make pistons at all.
I just did some research and found-outBill uses the same JE brand piston used in the Kustom Kraft kit, so your compression ration should be around 12:1. You can probably find a good engine shop to do the measurements and cc the head to see exactlywhat yourcompression ration is. You may be able to lower itby going with a thicker base gasket.I'm not savvy enough to knowwhether that will be enough though.
I just did some research and found-outBill uses the same JE brand piston used in the Kustom Kraft kit, so your compression ration should be around 12:1. You can probably find a good engine shop to do the measurements and cc the head to see exactlywhat yourcompression ration is. You may be able to lower itby going with a thicker base gasket.I'm not savvy enough to knowwhether that will be enough though.
ORIGINAL: MaverickAus
LA Sleeve piston according to the box it came in
LA Sleeve piston according to the box it came in
Senior Member
Joined: Oct 2006
Posts: 3,106
From: Misawa Japan
1st Gear Member
RE: Got my Bill Blue 331 kit
All of my posts were quoting either FM or Maverick. 'What scew went yoo' and what did you score for reading comprehension? 
I know you're always posting just to increase your post count, but jeeze! [8D]
I know you're always posting just to increase your post count, but jeeze! [8D]
ORIGINAL: EMS_0525
you talking to yourself again dean? lol
you talking to yourself again dean? lol
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Joined: May 2007
Posts: 50
RE: Got my Bill Blue 331 kit
Just fit the thing already. It isn't hard, took me two nights and I'm a gumby. Nobrakes and Marty did an excellent pictorial that's around somewhere. I'm curious to see how you go with jetting, you've got a TM33 don't you?
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RE: Got my Bill Blue 331 kit
Hey, Dean, hey guys. Sorry...I've been away awhile.
Dean, you have a great memory. Luke's Racing suggested that we modify the head to lower compression a bit. In addition to increasing the combustion chamber size, he removed the rough recesses around the valves, polished and ported everything except the intake which he left a little rough to help with mixing. Nice work overall and boy does it run! By the way, the FMF with Power Bomb is "The Bomb!" I got back some of the upper RPM power I was looking for. I'd like to dyno it again to see where it is now, but it's good. Ask VFR Pilot. We played together in Arkansas last March.
Bill Dragoo
Norman, Oklahoma
Dean, you have a great memory. Luke's Racing suggested that we modify the head to lower compression a bit. In addition to increasing the combustion chamber size, he removed the rough recesses around the valves, polished and ported everything except the intake which he left a little rough to help with mixing. Nice work overall and boy does it run! By the way, the FMF with Power Bomb is "The Bomb!" I got back some of the upper RPM power I was looking for. I'd like to dyno it again to see where it is now, but it's good. Ask VFR Pilot. We played together in Arkansas last March.
Bill Dragoo
Norman, Oklahoma
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Joined: Jan 2006
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RE: Got my Bill Blue 331 kit
ORIGINAL: kbekus
Just fit the thing already. It isn't hard, took me two nights and I'm a gumby. Nobrakes and Marty did an excellent pictorial that's around somewhere. I'm curious to see how you go with jetting, you've got a TM33 don't you?
Just fit the thing already. It isn't hard, took me two nights and I'm a gumby. Nobrakes and Marty did an excellent pictorial that's around somewhere. I'm curious to see how you go with jetting, you've got a TM33 don't you?
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