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Old 04-11-2010, 10:49 PM   #1 (permalink)
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big bore kit

What is a big bore kit?I was thinking of doing some things to the motor since it went out and i'm going to rebuild it..And another member here recomended a big bore kit.
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Old 04-12-2010, 12:05 AM   #2 (permalink)
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A big bore kit replaces your stock cylinders and pistons with larger cylinders and pistons to increase cc's. Usually, a different pipe/can is also required, and sometimes a reflash of your ECU will be necessary.

If you are considering a kit on your 800, SLP makes a nice one.

Polaris - Peformance Edition Package for 2002-05 Polaris 800 VES - Starting Line Products

You can also get a lot of bang for your bucks by going to an SLP singe pipe/can, SLP intake, and V-ForceIII reeds. Clutch to SLP specs and hold on! Just adding the pipe/can and intake stuff will bump you close to 150 hp up from 136, which is VERY noticable in the Edge. My 02 was set up like that and was a very fun sled to ride.
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Old 04-12-2010, 12:22 AM   #3 (permalink)
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Quote:
Originally Posted by BC_Dan View Post
A big bore kit replaces your stock cylinders and pistons with larger cylinders and pistons to increase cc's. Usually, a different pipe/can is also required, and sometimes a reflash of your ECU will be necessary.

If you are considering a kit on your 800, SLP makes a nice one.

Polaris - Peformance Edition Package for 2002-05 Polaris 800 VES - Starting Line Products

You can also get a lot of bang for your bucks by going to an SLP singe pipe/can, SLP intake, and V-ForceIII reeds. Clutch to SLP specs and hold on! Just adding the pipe/can and intake stuff will bump you close to 150 hp up from 136, which is VERY noticable in the Edge. My 02 was set up like that and was a very fun sled to ride.
Yep it's for the 800,i forgot to put that in here.The last owner allready put an slp pipe and can on it,and v-force 3 reeds.The primary clutch was gone through when the tune up was done before the season started.And i had the secondary clutch rebuilt before the motor went out.Mine is an 02 edge rmk also.On the big bore kit,is the piston connecting rod changed to or is it the same?And thanks for the info about the ecu reflash,i wasn't aware of that.
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Old 04-12-2010, 09:08 AM   #4 (permalink)
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If you're going to keep your Edge for a while, I would consider buying a bottom end from Indy Specialty. Indy Dan does GREAT work and stands behind it. He really knows those 800 engines. Kind of spendy, but it will be the last time you have to worry about the bottom end on that engine!

The reflash would only be necessary if you are doing a big bore on an EFI engine. If you do the BB on your engine, you will have to rejet the carbs to add more fuel. It's REALLY critical to reflash the newer Polaris sleds, they are dangerously lean in the midrange as it is to comply with EPA standards.

The stroke is the same on the Edge BB, you use the same bottom end with bigger cylinders and pistons. Some places will want your bottom end so they can do some modifications for better air flow as well.

Good luck in your choice! It gets confusing and can be spendy enough that you may consider getting a newer sled instead of fixing the old one!
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Old 04-12-2010, 03:29 PM   #5 (permalink)
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Quote:
Originally Posted by BC_Dan View Post
If you're going to keep your Edge for a while, I would consider buying a bottom end from Indy Specialty. Indy Dan does GREAT work and stands behind it. He really knows those 800 engines. Kind of spendy, but it will be the last time you have to worry about the bottom end on that engine!

The reflash would only be necessary if you are doing a big bore on an EFI engine. If you do the BB on your engine, you will have to rejet the carbs to add more fuel. It's REALLY critical to reflash the newer Polaris sleds, they are dangerously lean in the midrange as it is to comply with EPA standards.

The stroke is the same on the Edge BB, you use the same bottom end with bigger cylinders and pistons. Some places will want your bottom end so they can do some modifications for better air flow as well.

Good luck in your choice! It gets confusing and can be spendy enough that you may consider getting a newer sled instead of fixing the old one!
Thanks for the info on the reflash,i don't have to worry about that cause mines not an efi.I allready tried getting a new sled but that fell through.And i talked to an older guy that works on sleds and he recomended getting the upgraded pto end bearing for the crank.I'm almost got the case apart so i can get a look at the crank,ect.When you say bottom end,do you mean crank?Thanks for all the info BCDAN.I'm sure i'll have more questions.
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Old 04-12-2010, 10:23 PM   #6 (permalink)
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Bottom end = crank and case

Many of the crank issues that have occured in the 800 big block can be attributed to weak crankcases that can't hold up to the power of the engine. The casting of the case is very porous, which is why the larger PTO bearing helps; it spreads out the force across a bigger surface in the case. More bearing surface is a good thing!

Good luck!
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Old 04-13-2010, 03:30 AM   #7 (permalink)
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Thanks much for the info bcdan.When i get the case pulled apart the rest of the way i'll post up some pics.
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Old 04-20-2010, 03:55 AM   #8 (permalink)
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Does the bb kit come with the gaskets,rigs,ect.along with the pistons,and cylinders?Or do i need to get the gasket kit seperate?
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Old 04-20-2010, 09:12 AM   #9 (permalink)
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depending on brand and package. Some kits are very basic, some come with every nut and bolt you may need. Just look at your options and see witch one works best for you
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Old 04-21-2010, 03:14 AM   #10 (permalink)
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depending on brand and package. Some kits are very basic, some come with every nut and bolt you may need. Just look at your options and see witch one works best for you
thanks
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