Cylinder works 270cc kit....

Socket946
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Socket946
Edited Date/Time 12/3/2013 2:06pm
Any opinions? CRF is coming up on a piston change as per the manual, so thinking of ordering this....of course, while I am in there, seems like all of Jay Clarke's bikes with this kit get the stage 2 hotcam to go with it...

Right now, I figure the kit is about 425, and the cam is about 175...and then I'll send the ECU to Eddie S....has anyone had any personal use of this kit on their honda? Any opinions?
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ML512
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ML512 11/14/2013 7:14pm
11/14/2013 7:14pm Edited Date/Time 11/14/2013 7:15pm
I just spun some laps on jay's bike your talking about, it is one of the most fun bikes I've tried, super long usable powerband. Big bore 250fs are fun, especially fuel injected ones.
Griff.747
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Griff.747 11/14/2013 7:21pm
11/14/2013 7:21pm
The big bore 250f is awesome. The one complaint I have about it is they get HOT. I've run both cylinder works and Athena and they both do it. To the point where every time I'm spewing steam out of the overflow hose. I started running engine ice coolant and it totally fixed the problem. Other than that I absolutely love the big bore kits. And the stage 2 cam really opens them up too
Socket946
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Socket946 11/14/2013 7:45pm
11/14/2013 7:45pm
Griff.747 wrote:
The big bore 250f is awesome. The one complaint I have about it is they get HOT. I've run both cylinder works and Athena and they...
The big bore 250f is awesome. The one complaint I have about it is they get HOT. I've run both cylinder works and Athena and they both do it. To the point where every time I'm spewing steam out of the overflow hose. I started running engine ice coolant and it totally fixed the problem. Other than that I absolutely love the big bore kits. And the stage 2 cam really opens them up too
Good info...it gets super hot here.

I'll pick up some engine ice for the build when it's done.

Anyone have a time frame from start to finish? I've done a million 2 stroke top ends before...built car motors, and sport bike motors..

Never once built a 4 stroke single setup. I have all the tools...
Griff.747
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Griff.747 11/14/2013 7:49pm
11/14/2013 7:49pm
Depending on how smooth it all goes and valve adjustments. It's a very easy day job. Probably 4to 5 hours or so if all goes well

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Socket946
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Socket946 11/14/2013 7:59pm
11/14/2013 7:59pm
Nice. Speculate 15 hours on this brand new bike...

Will I need to plan on shimming the valves? I will check clearances, but should I order the shim kit also?
Griff.747
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Griff.747 11/14/2013 8:06pm
11/14/2013 8:06pm
If there's only fifteen hours on the bike you would probably be ok but I would check clearances before you order just to be safe so you can get it all in one order if you need to
Paw Paw 271
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Paw Paw 271 11/15/2013 5:54am
11/15/2013 5:54am
The RPM Ice Cube cylinder big bore kit does not run hot. It cost more, but will last longer and not run hot.

Paw Paw
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Riesenberg448 11/15/2013 7:54am
11/15/2013 7:54am
We've worked with them doing suspension for quite a few of these, so I've had a chance to speak with the riders after riding them "off the record". Each time I hear how fun they are to ride and how it's nice having the extra power with the handling of a 250f.
Socket946
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Socket946 11/15/2013 8:11am
11/15/2013 8:11am
Thanks for the information guys. Ordered the kit, 425 shipped feels like a smokin deal. Ordered the stage 2 hot cam as well..

Pretty pumped to get it setup and going.
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Paw Paw 271 11/15/2013 10:34am
11/15/2013 10:34am
Socket946 wrote:
Nice. Speculate 15 hours on this brand new bike... Will I need to plan on shimming the valves? I will check clearances, but should I order...
Nice. Speculate 15 hours on this brand new bike...

Will I need to plan on shimming the valves? I will check clearances, but should I order the shim kit also?
If you change the cam, your clearances will change. You will need the shim kit.

Paw Paw
Griff.747
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Griff.747 11/15/2013 11:50am
11/15/2013 11:50am
^ your right I totally forgot and wasn't thinking about the cam in also. Oops haha sorry
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FGR01 11/15/2013 11:58am
11/15/2013 11:58am
Paw Paw 271 wrote:
If you change the cam, your clearances will change. You will need the shim kit.

Paw Paw
Not necessarily. When I put a stage-2 Hotcam in my CRF450 the clearances were exactly the same as the stock cam. I've had others tell me they had similar experience with Hotcams.
njracer46
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njracer46 11/15/2013 12:15pm
11/15/2013 12:15pm
i had a stage 1 in my 07 crf250r, never had to shim the valves after i put it in
Socket946
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Socket946 11/15/2013 2:49pm
11/15/2013 2:49pm Edited Date/Time 11/15/2013 2:50pm
thankfully, a good local shop sells them (The shims) ala carte, or the whole kit.
Socket946
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Socket946 11/15/2013 4:07pm
11/15/2013 4:07pm
Paw Paw 271 wrote:
If you change the cam, your clearances will change. You will need the shim kit.

Paw Paw
FGR01 wrote:
Not necessarily. When I put a stage-2 Hotcam in my CRF450 the clearances were exactly the same as the stock cam. I've had others tell me...
Not necessarily. When I put a stage-2 Hotcam in my CRF450 the clearances were exactly the same as the stock cam. I've had others tell me they had similar experience with Hotcams.
What were you feelings on the stage 2 cam? Wake the bike up, or?
Griff.747
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Griff.747 11/15/2013 4:14pm
11/15/2013 4:14pm
I put stage 2s in one of my Kawis (I know a lot different than a honda but...) and it made a huge difference. I did that before I put the big bore kit in. If your a rider that rides high in the rpm's like I do it will really surprise you. I mean I noticed a considerable difference everywhere but I really noticed a huge difference in the top. Them I added the big bore and it made the power smoother everywhere and pull soooo much harder off the bottom
Socket946
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Socket946 11/15/2013 4:20pm
11/15/2013 4:20pm
Nice. I just mailed off the ECU to Eddie Sisneros...so hyped to get that, the kit, and the cam all in next week to try it out.
Griff.747
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Griff.747 11/15/2013 4:49pm
11/15/2013 4:49pm
In that Kawi I had the 270 Athena kit stage 2 hot cams port an polish vortex CDI and DR.D pipe. Honestly it was one the funnest bikes I have ever owned

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FGR01
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FGR01 11/15/2013 6:51pm
11/15/2013 6:51pm
Socket946 wrote:
What were you feelings on the stage 2 cam? Wake the bike up, or?
The stage-2 is very good in the 2009 and newer CRF450's. Stock they are pretty flat on top and the stage-2 gets you some over rev and top end. I've heard they are very good in the newer EFI CRF250's also.
Socket946
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Socket946 11/15/2013 9:28pm
11/15/2013 9:28pm
Socket946 wrote:
What were you feelings on the stage 2 cam? Wake the bike up, or?
FGR01 wrote:
The stage-2 is very good in the 2009 and newer CRF450's. Stock they are pretty flat on top and the stage-2 gets you some over rev...
The stage-2 is very good in the 2009 and newer CRF450's. Stock they are pretty flat on top and the stage-2 gets you some over rev and top end. I've heard they are very good in the newer EFI CRF250's also.
I'll let ya ride it when it's done! I hope it does..the lack of power the crf is kind of sad when you look at maintenance needed...
Socket946
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Socket946 11/16/2013 4:06pm
11/16/2013 4:06pm
Hey guys, any worries about piston to valve clearance? The stage 2 cam I figure will have some more lift and duration, but the 270 is still stock compression....again, any worries?
Griff.747
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Griff.747 11/16/2013 4:12pm
11/16/2013 4:12pm
Unless something is severely out of whack you shouldn't have a single issue. I know that I didn't have any anyway
charley586 11/18/2013 6:32pm
11/18/2013 6:32pm
Easy job to do but since it's your firet 4 stroke job take your tirme. I have the works kit and hotcsm stage 2, yosh pipe and Eddy map and my bike is a blast to ride. You should order a new rear sproket right away. Last thing you should change the rear rim for a 2.15 and run 110 tire because of the added power you will need more grip.
Socket946
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Socket946 11/19/2013 5:31pm
11/19/2013 5:31pm Edited Date/Time 11/19/2013 5:32pm
Charley, what's the recommended gearing change?

I already have a chain and sprockets waiting to go on. I think factory on the '12 is a 49/50....I ordered a 51.

Edit: Big bore kit and cam are here. Eddie Sisneros is one bad ass guy; I mailed the ECU friday, he got it tuesday (They're open Tuesday-Saturday)...and it'll be here tomorrow. Going to build the motor on Thursday.
charley586 11/20/2013 5:07am
11/20/2013 5:07am
Socket946 wrote:
Charley, what's the recommended gearing change? I already have a chain and sprockets waiting to go on. I think factory on the '12 is a 49/50....I...
Charley, what's the recommended gearing change?

I already have a chain and sprockets waiting to go on. I think factory on the '12 is a 49/50....I ordered a 51.

Edit: Big bore kit and cam are here. Eddie Sisneros is one bad ass guy; I mailed the ECU friday, he got it tuesday (They're open Tuesday-Saturday)...and it'll be here tomorrow. Going to build the motor on Thursday.
I think stock is a 49 and I went for a 48. If you go with a 51 the gear will be too short because of the increase power. The 49 was a little bit short for my taste but in technically trails it was perfect.

I will definitely return the 51 and get a 48.
Socket946
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Socket946 11/20/2013 7:21am
11/20/2013 7:21am Edited Date/Time 11/20/2013 7:22am
charley586 wrote:
I think stock is a 49 and I went for a 48. If you go with a 51 the gear will be too short because of...
I think stock is a 49 and I went for a 48. If you go with a 51 the gear will be too short because of the increase power. The 49 was a little bit short for my taste but in technically trails it was perfect.

I will definitely return the 51 and get a 48.
So I'm not doing much in the way of tight, technical trails. This will be only for motocross.

I am going to try the 51, and see how it is. If it puts me in 4th gear where I was in 3rd, I am OK with that. If it's tooo short, then I'll look to change.

Edit: I am looking to go to a 110 rear tire, as well.
charley586 11/20/2013 7:29am
11/20/2013 7:29am
charley586 wrote:
I think stock is a 49 and I went for a 48. If you go with a 51 the gear will be too short because of...
I think stock is a 49 and I went for a 48. If you go with a 51 the gear will be too short because of the increase power. The 49 was a little bit short for my taste but in technically trails it was perfect.

I will definitely return the 51 and get a 48.
Socket946 wrote:
So I'm not doing much in the way of tight, technical trails. This will be only for motocross. I am going to try the 51, and...
So I'm not doing much in the way of tight, technical trails. This will be only for motocross.

I am going to try the 51, and see how it is. If it puts me in 4th gear where I was in 3rd, I am OK with that. If it's tooo short, then I'll look to change.

Edit: I am looking to go to a 110 rear tire, as well.
You will be wasting your time with the 51. For 50$ a new sproket don't loose time and order a 48 right away. Even a stock engine with a 51 is a gearing for real SX track.

To give you an idea, I raced the MTA world vet race in Glen Helen 3 weeks ago and I was going on top on Mt Helen and ''the finger'' in 4th gear without issue.
Socket946
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Socket946 11/21/2013 5:21pm
11/21/2013 5:21pm
Bike is together, motor sounds mean. It's running smooth, and feels good around my house. When idling down from snapping the throttle, the idle will hang at 3-4k. Once a load is put on, it drops back to 2k.

Any ideas?
Socket946
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Socket946 11/21/2013 6:39pm
11/21/2013 6:39pm
Sigh, and now i realise; I was turning the idle knob counter clock wise, and that's backwords.

I'll start the bike tomorrow and mess with the idle

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