The all new Big Red 250es / 250sx 350cc big bore kits are in stock.

[nilesj]

where do the oil coolers mount?

[Mickey Dunlap]

where do the oil coolers mount?

I'm mounting mine on the back of the air box out of site. It does not work by air going though it , it radiates the heat out of it. With in a min. after shutting it of it cooled off. So you can mount it where ever you want.

[Gator72007]

Anyone running this kit on here yet?
How do i go about re-sleeving my cylinder? Could any machine shop do it? Does it come with the machining specs for the bore?

[Mickey Dunlap]

Anyone running this kit on here yet?
How do i go about re-sleeving my cylinder? Could any machine shop do it? Does it come with the machining specs for the bore?

You can send your cyl. in or have them bored any where.

[oile]

Mickey what was the HP increase?

[Mickey Dunlap]

Mickey what was the HP increase?

I think it was 9 stock and 16 when I got done if I remember right.

[dsprad26]

Definitely a must have for my 250sx project I will be starting soon. The video of the big red you did blew my mind. Do you have a ballpark figure for the whole thing, sleeve and piston kit, stage 2 cam any headwork needed, oil cooler etc.? Is the 400x carb a direct swap or will any modification be needed to bolt that on? I will be looking forward to getting started on this one for sure.

[Gator72007]

You can send your cyl. in or have them bored any where.

Whats the cost for you to put the new sleeve in if i ship it? Thanks

[Mickey Dunlap]

Definitely a must have for my 250sx project I will be starting soon. The video of the big red you did blew my mind. Do you have a ballpark figure for the whole thing, sleeve and piston kit, stage 2 cam any headwork needed, oil cooler etc.? Is the 400x carb a direct swap or will any modification be needed to bolt that on? I will be looking forward to getting started on this one for sure.

The kit with piston, sleeve ,head gasket, cam, valve and clutch springs is $610 exchange on the cam, plus shipping. Oil cooler kit is $85. We charge $200 to re-sleeve the cylinder. We ended up using the 300ex carb you can get for about $65 new off e-bay. The 400ex carb was too big.

[djm0242]

Safe to say might as well replace clutch plates or at least inspect I'm sure when considering the power upgrade.

[Mickey Dunlap]

Safe to say might as well replace clutch plates or at least inspect I'm sure when considering the power upgrade.

Mine had the stock ones and I re-used them. Just added my springs.

[oscarmayer]

do these require case boring?

[Mickey Dunlap]

do these require case boring?

No this is only top end work and pulling the clutch cover to put my spring in.

[oscarmayer]

No this is only top end work and pulling the clutch cover to put my spring in.

Awesome!! Thank you sir!!


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[Mickey Dunlap]

The 250sx guys are complaining they can't use all the power because the front end won't stay down. That's what I knew with our old 315cc kits, so they work better in the Big Red 250.