Author Topic: Trinity 330 big bore (Read 2386 times)

LTZ-450 · « **on:** May 12, 2013, 05:58:26 pm »

I have a Trinity Racing 330 big bore motor with a Trinity turbo crank. Needs piston or at least rings and lower rod bearing. Message me with any questions

El Diablo · « **Reply #1 on:** May 12, 2013, 09:15:49 pm »

Post up a picture or two & the price.

Golden250r · « **Reply #2 on:** May 12, 2013, 09:21:51 pm »

for the lt250? what year will it fit?

Motoman991 · « **Reply #3 on:** May 12, 2013, 10:10:40 pm »

Trinity made a 330 kit for the LT?

Rainman56 · « **Reply #4 on:** May 13, 2013, 06:21:29 am »

I posted an 87 250 that was for sale on ebay.It had a trinity 330 so I,m assuming they do in fact build one.

Quadster · « **Reply #5 on:** May 13, 2013, 11:35:49 am »

Trinity cylinder/head work with an .80 over 69mm piston?? Cause you know 250+80=330.

WestTexasKing · « **Reply #6 on:** May 13, 2013, 12:30:16 pm »

I've got a big bore something or other 250.
Uses a different piston I think because the bore is so big.
Think I'm going to check and see what the bore measurement is today.

Motoman991 · « **Reply #7 on:** May 13, 2013, 12:40:20 pm »

I want to see the bore and stroke measurements. I am doubting the 330cc. I'm going with what Quadster said.

LTZ-450 · « **Reply #8 on:** May 13, 2013, 01:47:09 pm »

Quote from: Motoman991 on May 13, 2013, 12:40:20 pm

I want to see the bore and stroke measurements. I am doubting the 330cc. I'm going with what Quadster said.

Quote from: Quadster on May 13, 2013, 11:35:49 am

Trinity cylinder/head work with an .80 over 69mm piston?? Cause you know 250+80=330.

Piston is 73.95 mm bore is 74 mm not sure on stroke I was told it was a 330 if you call trinity they will tell you that they use to do a 330 for the lt250r. it may be only 295 cc i'll try to find out the stroke when I get time and put up some pictures.

WestTexasKing · « **Reply #9 on:** May 13, 2013, 02:25:50 pm »

Just measured mine and it's at 74.2mm (hard to get a good measurement from a cylinder that had a seized piston)...can't find piston anywhere.
No idea how to accurately measure stroke while crank is inside case, but there is a spacer under cylinder.
Cylinder is engraved with LRD, definitely ported, no measurements engraved anywhere, only serial numbers and re-sleeved noted under intake.
Bonus...just realized the head has been O-ringed LOL

Gillio · « **Reply #10 on:** May 13, 2013, 03:39:03 pm »

They offered 330 when I had my 290 built.

LTZ-450 · « **Reply #11 on:** May 13, 2013, 06:15:39 pm »

some pictures

LTZ-450 · « **Reply #12 on:** May 13, 2013, 06:23:33 pm »

LT500Kid · « **Reply #13 on:** May 13, 2013, 06:40:39 pm »

Trinity made a turbo crank?

J/k

LT250RWV · « **Reply #14 on:** May 13, 2013, 07:16:26 pm »

It must be made up for the cc in the rods.The piston in the picture is 67.50mm so it only bored .20 over.

Stpltn250r · « **Reply #15 on:** May 13, 2013, 07:22:42 pm »

you do see the huge gap between the piston and the sidewall dont you? looks like a screwdriver is even in there.

Mitch Keller · « **Reply #16 on:** May 13, 2013, 07:27:29 pm »

Whats the spacer plates thickness?

LT250RWV · « **Reply #17 on:** May 13, 2013, 07:27:47 pm »

No my bad i didnt see it.

LTZ-450 · « **Reply #18 on:** May 13, 2013, 07:43:30 pm »

Quote from: Mitch Keller on May 13, 2013, 07:27:29 pm

Whats the spacer plates thickness?

no spacer plate

Kyle T · « **Reply #19 on:** May 13, 2013, 08:33:41 pm »

Fooled me too.
Sleeve looks AWFUL thin...
Anyway. 74mm piston+76.7mm stroke=329.87cc. Or more likely, 74mm piston+76mm stroke=326.86cc, so +7mm bore, and +6mm stroke. Methinks the piston would freeport, unless it was a longer piston, then it would only hit the crank at BDC, so a longer rod is needed, which would need a spacer plate, unless the piston is designed for it. Know what I mean?
Also, ouch on the head stay mount.

Mitch Keller · « **Reply #20 on:** May 13, 2013, 10:11:25 pm »

Too bad ESR never made a big bore aftermarket cylinders for the LT250

Glamisrider · « **Reply #21 on:** May 14, 2013, 05:27:41 am »

Well I know ESR makes a 330 & a 370 kit for the Hondas.

On the 370 kit you have to have the cases ported.

GrkGuy · « **Reply #22 on:** May 14, 2013, 07:36:26 am »

i think esr even makes something bigger than those, well it had to be when i got beat by one on my bird.

Kyle T · « **Reply #23 on:** May 14, 2013, 07:55:28 am »

Duncan was the only one I know of to offer a cylinder for the LT250R.

WestTexasKing · « **Reply #24 on:** May 14, 2013, 12:02:40 pm »

Quote from: Mitch Keller on May 13, 2013, 10:11:25 pm

Too bad ESR never made a big bore aftermarket cylinders for the LT250

Too bad the bottom end wouldn't hold up to that kind of punishment.
From what I've read, they barely hold up to the 270HRD.

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Author Topic: Trinity 330 big bore (Read 2386 times)

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