RK Tek Big Bore, anyone got one?

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momoney2123

New member
Has anyone big bored any of their 800's from RK Tek on here, any brand? Anyone else considered this?

I have been researching this and I might give it a go. wanted to see if anyone has any input or luck with theirs?

RK Tek claims to have the BB kit dialed in for 800Etec bored to 860cc's with stock exhaust and intake, no fuel programer needed at low elevation with 25+Hp gains over stock and claims reliability to be equal to or better than stock. Dual ring pistons and their pattented head being the positives over stock. Lot of positive feedback from mountain riders on the 860 ptek and etecs. But hard to find feedback from low elevation. For $1850 it seems like a reasonable Mod.

They have kits for Doo, Cat, and Poo so any input from anyone is appreciated.

http://www.2strokeheads.com/bigbore800R.htm

Here is the site if anyone else is interested
 
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ezra

Well-known member
I have seek the clams.
do u really believe they can punch out your jugs change port timing and give u 25hp with no fuel map changing at all elevations ? and not on just a ski doo but they can also do it on a cat motor .
hey I got a real nice bridge for sale wanna buy it?
I have heard of a few highland guys running his big bore with stock pipe on the 08 09 cat 800 with no controller but none down low.
come on 25hp with just a 100cc punch out not going to happen Kelsey must be using bikemans dyno to get those numbers
 
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willey

New member
If you are in need of reel world data I would strongly suggest giving John a call at sled head racing. John has been doing bb's for on doo 800 motors. I have not owned one of his big bores but can speak to his quality work and knowledge when it came to my 800r. 860 or 880 is his bread and butter. Nice to have him close by also!
 
srt20

srt20

Active member
A buddy has RK Tec 860 in a ptek XP. He has had it for a lot of miles. Ridden up high and down here. He is happy with it.

He has the RK Tec piston in a 12 rmk with small domes and it runs perfect. He is probably going with the 858 for his 13 rmk this summer. He already does have a controller for the 13. The rmks are not ridden down here though.

Make sure you get that doo crank checked out before putting $$$ in the engine.
 
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momoney2123

New member
Ive read alot on dootalk where he replies on his product and he seems like a straight shooter. Says put his BB on any dyno. Not about the top HP number but delta in start to end. Obviously makes sense. Dynos can be manipulated. Its all about the porting to make it work for the big numbers and he may have it right.


Ive also read some good things from big johns 860s..him and kelsey seem to have it figured out. Not many in the midwest tho??

Srt20.my crank is warranteed for 3 years
 
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Deleted member 10829

Guest
I just wonder if it's worth almost $2,000 to gain 25 HP? The 800 Etec is pretty strong stock! You don't void the factory warranty do you?
 
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ezra

Well-known member
2k for 25hp is a steal in the HP game but I am highly suspect it is close to 25 with just punching out a jug and popping on a mod head.
I have spent countless $$$$ on speed especially when I was still living hard in the lake race scene.
I can see 25 out of a twin with a 100cc punch out high end porting of jugs and case pipe set .
I have heard good things about Kelsey but I would bet the farm u bring any of his kids down off the hill at 0 to 3k altitude with out a box and U will be buying pistons and making a call to millennium tech. then buying a AF/egt set and a boondocker and spending 10 hrs or so dialing in on a lake
 
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momoney2123

New member
ezra said:
2k for 25hp is a steal in the HP game but I am highly suspect it is close to 25 with just punching out a jug and popping on a mod head.
I have spent countless $$$$ on speed especially when I was still living hard in the lake race scene.
I can see 25 out of a twin with a 100cc punch out high end porting of jugs and case pipe set .
I have heard good things about Kelsey but I would bet the farm u bring any of his kids down off the hill at 0 to 3k altitude with out a box and U will be buying pistons and making a call to millennium tech. then buying a AF/egt set and a boondocker and spending 10 hrs or so dialing in on a lake
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25hp would be a good deal i agree. If I could consistantly run 180hp id be pretty happy. A lot of independant people have been getting a good 15hp from a port job alone on the 800e's, so i do believe the 25hp isnt impossible out of the BB. As i mentioned Kelsay clearly states most of the power isnt really from the bigger bore, its the porting. He also has a 12 hp 'drop in kit'. Kelsay has claimed to test it out in low elevation in cold temps and said the Etec ECM will still richen it enough that no fuel controller is needed. This year def woulda been the year to find out!!! Which would save $500. Having talked with kelsay on the matter I enfasized I DID NOT want to sacrifice reliabilty and that was his whole focus in the design of this kit. There is no doubt that his Dual ring tighter toleranced pistons are historically more reliable than the stock Single rings. I loved my stock 800e, but with so many in our group i was thinking of getting a little crazy while im still young and dumb.

As far as warranty, yes this would void the engine warranty...butttttt my plan was to buy a set of cylinders and a head(right now $400 on ebay) and prolly easy to find at haydays, send those to kelsay and keep my stock cylinders, head, and pistons in case **** got weird in the middle of the season. so most i would be down is a day at worst case. Good thing I have a whole summer to think about it. Having a good relationship with dealer and the countless doo's my family has purchased, warranty claims over the years have been smooth for us, even when stuff was modded or sleds were out of warranty.
 
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ezra

Well-known member
what u are doing is the best way .I have always gotten trashed out jugs to use when going big bore.
because the other thing to think about is only a small hand full of guys will want to buy the sled with the big bore and none of them will pay for it. u will take a huge hit on a mod sled.
slap it back to stock then sell your mod parts usually don't loose much at all on mod top end kit.
there has to be some flat landers running his stuff on doo talk or hcs
 
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momoney2123

New member
ezra said:
what u are doing is the best way .I have always gotten trashed out jugs to use when going big bore.
because the other thing to think about is only a small hand full of guys will want to buy the sled with the big bore and none of them will pay for it. u will take a huge hit on a mod sled.
slap it back to stock then sell your mod parts usually don't loose much at all on mod top end kit.
there has to be some flat landers running his stuff on doo talk or hcs
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Yea that was my plan when re-selling. Put it all back to stock. I have seen some comments from guys at low elev running the 860 on carbed 800's pteks, which is very similiar to etec. I would actually use pTek jugs, with etec head, as kelsay said it will work no problem. Then the 1 reply on here with ptek, they all r happy with the power. But They can obviously jet to their own likening on those motors where as I would be at the mercy of the Etecs brains unless I get a fuel controller. That is really the only worry i have. When its -25 on a morning ride, will she be too lean even when the ECM is giving it max fuel/oil in stock parameters.......he claims its rich enough..which i dont see a reason for him to lie about it. If he wasnt confident I would think he would just say if you want a BB on low Elevation, ur gona need a fuel controller...
 
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ezra

Well-known member
I downloaded BMP map in my power commander program for his 860 kit just to see what kind of numbers he was calling for for flat land not huge but I dont think any magic head or porting can make up 11%

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the high elevation map is calling for 9% at its highest did not shoot a pick of that.
not trying to rune your buzz just playing delves advocate from some one who has believed lots of clams in the past and spent countless hours trying to dial in false clams and spent thousands fixing issues from tuning to the edge.
I would do the kit but I would deff not run with out at min a quick response twin EGT.
and heck a boondocker is not that much cash and ez to put in and ez to tune if needed .
I like the boondocker way better for field tuning but the PC5 is real nice for a dialed in program to just plug and play and deff needed in the tight cat mid range
 

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indy_500

indy_500

Well-known member
Lots of guys running 858s in their pros from rk tek everyone seems to love them. I think the 858 is 1800$.
 
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momoney2123

New member
QUOTE=ezra;371083]I downloaded BMP map in my power commander program for his 860 kit just to see what kind of numbers he was calling for for flat land not huge but I dont think any magic head or porting can make up 11

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the high elevation map is calling for 9% at its highest did not shoot a pick of that.
not trying to rune your buzz just playing delves advocate from some one who has believed lots of clams in the past and spent countless hours trying to dial in false clams and spent thousands fixing issues from tuning to the edge.
I would do the kit but I would deff not run with out at min a quick response twin EGT.
and heck a boondocker is not that much cash and ez to put in and ez to tune if needed .
I like the boondocker way better for field tuning but the PC5 is real nice for a dialed in program to just plug and play and deff needed in the tight cat mid range[/QUOTE]


I hear ya. But he swears that no fuel controller needed. This is kelsays response on dootalk to someone questioning the fuel.....


I think I have stated this *a few times , quite recently,... but the ETEC has the ability to KNOW that it requires more fuel and SUPPLY this needed fuel..

So, stating that the RK Tek 860 requires no extra fuel is not correct.. It does require added fuel and the additional fuel*IS SUPPLIED by the OEM system management..

*

It really is that simple!!

*

Also stated many times... The RK Tek 860 has been and is running in the flat-lands without issues.. Again... been stated before.. just because you don't think you have seen one.. does not mean they are not there.
 
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ezra

Well-known member
have U called trygstad motorsports for a chat yet ? I know some doo guys love there stuff including dealers.
look up mac daddy racing pretty sure he is on here if not check over at hcs he spends a lot of time at the track on doo stuff and prob has the answers U are looking for and a flat lander
 
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momoney2123

New member
ezra said:
have U called trygstad motorsports for a chat yet ? I know some doo guys love there stuff including dealers.
look up mac daddy racing pretty sure he is on here if not check over at hcs he spends a lot of time at the track on doo stuff and prob has the answers U are looking for and a flat lander
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I have not talked to trygstad personally. I have read way too much on Trygstad, SHR, and RK tek. alot of positives from all 3 of these builders. Cant really find too much bad stuff on RK tek or SHR. The reason I am leaning towards Rk tek is i talked to him, seems like a straight shooter and he promises no fuel controller. I like his german forged dual ring pistons, and his Head design is unique, i even think SHR runs RKteks head and pistons, so i feel those kits r similiar. I actually just got done watching a video of a RK Tek Etec 860, with all other stock components dust a stock 800E and a Trygstad BB with pipes fuel controller aftermarket clutching and a plethera of other mods up a mountain. Trygstads kit is a 872 and fuel controller is required, id be into the kit for 3k+ by the time im done. i already have clutch parts and gearing so If goes as planned I will be into this for about 2g going with RK tek.
 
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