What do you think about new 350x big bore kits?

[atc-eric]

Hey trikers,

Heres the deal, Corey Sprock and I have been talking for a bit about building kits for the 85-86 350x at a reasonable price. This WILL be happening, I am here to see what sort of interest is out there.

I pulled the motor on my X for a freshening up, and decided that it wouldn't be to hard to accomplish.

We are sending the equipment off to CP to have custom pistons made, talking to a few company's about custom sleeves, then all that's left to do is machine the cylinders.

I know powroll already offers kits, the kits that are offered are for all the parts: sleeve, piston, gasket kit, then you have to find someone to sleeve it. That kit cost $335 just for the supplies. The kit that we will be building will be somewhere around $350-400 for a bolt on and go kit.

We are also going to be getting into head mods. We just acquired a valve grinding bench tool, that we will be experimenting with over the next couple of weeks. So we will offer the big bore kit at a good cost, and a complete web cam and springs setup for those looking to go all out.

The kit that we will safely be making starts out at 403cc's, so it will be a solid 400 kit.

I'm asking here to see what sort of interest we will have.

I have been working with Corey for a number of months, to basically take over his job of fulfilling orders. I have a lot of time in his machine shop producing Z big bore kits, I am a hair away from being able to do ALL the work myself. I know that the Z bigbore kits have taken a LONG time in the past, I too have had to wait for my engine, and I'm behind the scenes! We are only a couple of kits away from being completely caught up. We are also finally getting the swing arms done, so the time of Coreys hectic schedule terrorizing our trike needs IS at an end!

To keep these kits cheap, we will require a core cylinder. The cylinders that I have seen for sale on ebay don't come close to being under $100 per. SOOOO to keep the kits cheap we will take a core in exchange. We WILL be buying some cylinders here over the next while, so that as soon as yours comes in, we can send a completed one right back out. What we are going to do to make good on Coreys past schedule foul ups, is offer a major discount to anyone that has to wait more then a week for turn around time! If you send me your cylinder, and its not back in the mail within a couple days of receiving it, I will personally extend you a discount (still to be decided)

So anyways, who's down for cheap bolt and go power on their X?

And who has an X cylinder their willing to sell? All it needs is to have good base and cylinder surfaces. Bore does not matter.

Please chime in, and give me your opinion......

[NOS_350X]

I dont want to soudnd like an a-hole but what about the pistons, in a year, Or 2, Or 5. Just repacing one could be pricy unless your stocking them, but what about when you have to bore, You guys going to have overbore sizes.

[Gdkarma]

I'm in, since this is part of what my winter project was going to involve.:D

[250sx]

I'm interested, but also curious about overbores and piston availability. Looks like a good project. Any ideas on longevity given the additional pressures place on the stock bottom end? What compression ratio will this setup be running?

[atc-eric]

I don't want to sound like an a-hole but what about the pistons, in a year, Or 2, Or 5. Just replacing one could be pricy unless your stocking them, but what about when you have to bore, You guys going to have overbore sizes.


You don't sound like a a-hole at all, its the only thing I really didn't touch on. As of now, we are going with 12:1 compression ratio. The pistons will be 87mm 88mm and 89mm. We will be stocking the pistons and if you were really worried about them down the road, we can get you the over sized pistons with your initial purchase.

We will offer discounted boring, and pistons for the orginal purchasers if you for some freak reason need one within the next 10 years :) .


Any ideas on longevity given the additional pressures place on the stock bottom end?

As with any power adder, you will be adding extra wear and tear. We feel that the stock bottom end is beefy enough to accommodate this kit. My X will be the first, and will get a LOT of hours on it before we really get into selling these. So any unexpected problems will happen to mine before we have a number of them out there.


I'm in, since this is part of what my winter project was going to involve.

Very nice! All I can say is Im really freakin excited to have more power out of my X. Its one of my FAVORITE bikes to ride, cant wait to climb the dunes at Gordons Well the first try this time around! :headbang:

[Mr. Richard]

what about 10 to 1 so the pleasure riders don't have to run race gas ? i would be in for a 10 to 1 kit,,, we dump to much gas through the 350x to have to buy higher octane fuel all the time.

[ridetrikes250R]

I have dealt with CP for a long time on alot of 450 stuff, if they make the piston for these guys, you will be able to get it if the project dries up, the problem will be buyin in their wanted batch number.

id be interested in one and i dont even have a 350x...it would make me buy one

[atc-eric]

Richard I'm glad you brought that up. Our aim is to have it as close to not needing it as possible. Nothing is set in stone just yet. We have a few more measurements to figure out, but the setup will be good on pump gas.

I will have mine for you to test ride this January :burnout:

[Mr. Richard]

great!! my 350x still has the ORIGINAL piston so i wouldn't be to worried about spares!!! if a new one lasts 20 years i will probably be ok with that!!!

[NOS_350X]

Richard, With the 12:1 piston you can eather take off some of the material on the top of the piston, to lower the comrpession, you can also doubble up a base gasket and head gasket. This should get you in the 10:1 range.

[atc-eric]

Richard, With the 12:1 piston you can eather take off some of the material on the top of the piston, to lower the comrpession, you can also doubble up a base gasket and head gasket. This should get you in the 10:1 range.


That is EXACTLY what we are looking into. If the base gaskets are whats needed, we will be having thicker gaskets made to accommodate.



:)

[ridetrikes250R]

i like the base gaske tidea, i dont wanna grind on my 150 dollar piston

[co 250r man]

i like this idea the 350x is going to be one of my next trike purchaces

[jadleybray]

i like the base gaske tidea, i dont wanna grind on my 150 dollar piston
Why not, every piston I have is ground up.

[Duner]

i like this idea the 350x is going to be one of my next trike purchaces


I am kinda thinking the samething. Put in an electric starter to it, and a 400+cc 4 poke trike kinda makes me intrested as well...If your going to bring the compression down for some, hope you include those of us that dont mind race fuel for the extra power in return, maybe a 14.5:1 piston? I will be following this as you build your X and get some test n tune. I would like to see a before/after run up a hill vs a compareable bike...just my .02

[Duner]

Why not, every piston I have is ground up.


Thats why I now call you "Chopped sue ieeee":werd:

[atc-eric]

I would like to see a before/after run up a hill vs a compareable bike...just my .02


Excellent idea here! I have video of my attempts to make it up Paten (spelling) Valley hill at Gordons on the X last year. I made it EVERYWHERE every other bike on the ride went, it just took me a few more trys. I had to hit that hill at the TOP of 6th gear to try and make it, I eventually did. I have video of this.

When I go to Glamis in January, I know there will be at least one stock really healthy bike we can do a comparative with.

I will get back on compression. Im sure we can accommodate.



It looks like I already have around 10 core cylinders to work with, so the exchange will take no time. When you order, your cylinder will be headed your way in no time flat!

Im really excited here.........

[NOS_350X]

Cory there is alot of ways to work with comrpession. You can get a thinner head gasket and shave the head. Only thing is you must watch for a piston and Valve playing Freze tag... Once they touch the bike frezes/

[ridetrikes250R]

Quote:
Originally Posted by ridetrikes250R
i like the base gaske tidea, i dont wanna grind on my 150 dollar piston


Why not, every piston I have is ground up.


iam thinking of it from a customer perspective, many people arent like the "purests" they arent going to want to grind a top of a piston off, plus you would have a very hard time making sure people did it right, and then its just a hassle

[atc-eric]

Quote:
Originally Posted by ridetrikes250R
i like the base gaske tidea, i dont wanna grind on my 150 dollar piston


Why not, every piston I have is ground up.


iam thinking of it from a customer perspective, many people arent like the "purests" they arent going to want to grind a top of a piston off, plus you would have a very hard time making sure people did it right, and then its just a hassle


I have machined pistons for different kits before. If someone wants lower compression, and the piston is the way to go, I can make it look like I never touched it. If the compression is to high, and we need to do that, the machining will be included in the cost of the kit. :burnout:

[superchomper2003]

Im in on the deal! I would love a bolt together setup to get some good power outa the X.

[atc-eric]

Thanks for your votes everybody! Ill update with pictures, and progress as it comes.

[Mr. Richard]

yep,, i would rather have a piston that bolts in with an oem gasket set without "rigging" to get proper compression,, then there is no guess work,,, i am not building a racer just a dependable rider with a little more compression,, without "stacking or shaving" :thumbsup:

[atc-eric]

Hey Richard, Ill be bringing a couple kits with me in January. If you like you buy eh?




:yup:

[azjay]

Hey Richard, Ill be bringing a couple kits with me in January. If you like you buy eh?




:yup:
my 350x runs pretty good, but perhaps i should save my nickles and have a big bore kit just in case :cool:. i shoulda bought a 300 kit for my '83 when they were cheap and available too. hindsight :loser:

[bad350]

will the center cases have to be cut to accomodate the bigger sleeve?

[atc-eric]

No sir. We are building a sleeve that will squeeze right on in ;)

[leevarnado]

will the kit fit a 87 trx 350

[atc-eric]

Not sure if the TRX motor is the same........... I will do some research.

Can anyone verify?

[NOS_350X]

Yes, it will,

Now there is a big bore kit, What about getting some big valves?? I dont want a big bore but i would love some +2 valves.

[bad350]

i'm assuming the cam isn't included

[NOS_350X]

the head, cam and rockercover would not be included, all you would get is a CYL and piston.

[Goat]

Interested in 20 years newer tech, lightened stronger piston with superior oiling...sure.

I couldn't get the idea to pan out because of price. I sincerely hope you have better luck.

[leevarnado]

if it fits count me in on a 10 to 1 kit

[atc-eric]

Like stated before, we will be doing some head mods.

I cant give you specifics just yet on anything with the head, because I haven't gotten to it yet. My head is off to CP to have custom pistons made. But Yes Nos, oversize Valves are coming.


And that is correct, this kit only comes with the cylinder, and piston.

All the head mods we will be exploring will come at an extra cost.

Thanks.

[Tri-Z 250]

That is EXACTLY what we are looking into. If the base gaskets are whats needed, we will be having thicker gaskets made to accommodate.
:)
I've been trying to get those thicker base gaskets for the Z- 310kit from Corey...I haven't seen where BigBore has them listed anywhere. Send me a PM to order please.

[atc-eric]

Got your pm on planettrike.

[Tri-Z 250]

I've been trying to get those thicker base gaskets for the Z- 310kit from Corey...I haven't seen where BigBore has them listed anywhere. Send me a PM to order please.
Thanks for the Quick responce Eric $ sent

[atc-eric]

Hit the mail today. Enjoy!

[Goat]

Any idea when pistons will be ready. Standard size 11:1 or so.

[scrambler250R]

I think this is great, no I don't have a 350x now but it will be really nice to have this option when I get one. I have a couple of questions hopefully somebody can answer, what kind of power does a stock 350x make(at the wheels), any ballpark ideal what this kit might make, whats the most a fully modified 350x can make?

[Goat]

22-23 hp at the wheels...27 hp at the crank. TC of TC racing states that 45hp is the most you can get out of the stock bore, but that's dumping 3k or more into the motor for him to get weight out of it, apparently the last 5 hp or so is tough to get.

Others can comment on modified setups.

[scrambler250R]

Thanks man, how can I can I get in touch with TC racing, they have a website?

[ride_red]

I would definetly be interested around summer time (once school's out and I'm back to my summer job! :D)

[Gdkarma]

Once I get some information on previous builds, I'm MORE than happy to send money and core parts. Until then, I'm a bit leary of where my money is going.....don't want to sound like an *ss, but I'm still out around a hundred bucks without any information..................:duck: come clean, and I'm you're biggest customer!

[azjay]

let me add this, everybody that rode the big bore (i didn't) during the "imperial invasion" noticed a big difference over stock. the next weak link is the clutch, the big bore roasted a clutch. fortuately, the local honda shop had plenty of discs in stock. so plan on a fresh clutch too.

[Goat]

It's time we convince swigin to disclose what valve spring you have to run in the 350 clutch when pushing decent power to it. lol

Eric, tell sprock to shoot me an email if he still has it...or even a text for that matter. I'm curious about the kits, hoping to get back to work soon.

Need to know what compression ratios are offered...what kind of PSI you're seeing from that kit in yours... What all is needed and so on.

[ATC.250R]

I don't have my 350x anymore but seeing that you say clutches are the weak link on this big bore kit. have you considered a lockout from www.directdrivecnc.net they make a lockout for 250r's so i don't even know if it will fit a 350x but it might be worth a shot.

[390x]

It's time we convince swigin to disclose what valve spring you have to run in the 350 clutch when pushing decent power to it. lol

^^^ what he said!

[SWIGIN]

I'll sell anyone a set of big bore worthy clutch springs, just ask.

But I'll never tell exactly what they are.

[NOS_350X]

Its been a long time ago since i did my clutch in my X but i think i used springs out of a LC XR650. I could be wrong but i think thats what they where. Its shure the hell not easy to pull anymore.

[Goat]

Lol I'll buy a set when the time comes swigin. And chances are my bike will never leave my land.