Measuring deck height

[atlantazombie]

Quick post about measuring the piston to deck height on my stock 196cc motor. The piston sits way lower than stock at around 0.04 inches. Any reasons why?

(.035 in. Feeler gauge for context)

 

[BrownStainRacing]

Quick post about measuring the piston to deck height on my stock 196cc motor. The piston sits way lower than stock at around 0.04 inches. Any reasons why?

(.035 in. Feeler gauge for context)

Heres a quick mock up. This 1 is actually .004" out.

Make sure the big end of the rod is at the bottom, with the oil slinger. and arrow on piston is pointing down. At least 4 bolts in side cover to hold crank straight.

Allen wrench across the top of deck, measure at 3 o'clock and 9 o'clock with piston at tdc.

 

[atlantazombie]

Heres a quick mock up. This 1 is actually .004" out.

Make sure the big end of the rod is at the bottom, with the oil slinger. and arrow on piston is pointing down. At least 4 bolts in side cover to hold crank straight.

Allen wrench across the top of deck, measure at 3 o'clock and 9 o'clock with piston at tdc.

Alright took the cover off and here’s the setup I measured with:

 

[BrownStainRacing]

Alright took the cover off and here’s the setup I measured with:


View attachment 139459View attachment 139460View attachment 139461

Looks like you have got it right.
That .040" really makes it low CR, probly 7-7.5:1.

You gonna need a +.020" rod, .009" head gasket, dished piston, and a 14cc head to get it near 10.5:1 CR.

Run some numbers thur that cr calculator and see what you come up with.

 

[BrownStainRacing]

OMB still has the cheapest 14cc head. All your old head parts will fit right in.

You have to unshround the valves jus a lil, about .5 -.75cc is plenty, take the left over casting flash out of the runners, and knock those sharp edges down in the bowl area. Lap the valves to make sure they seal.

Ez Pz. 10.5:1 CR.
212's is gonna play hell trying to keep up with it,

Cylinder Head for Clone - HI COMP 14cc

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

 

[atlantazombie]

Alright I got the parts set up, hopefully this lil motor can turn out to be a beast

Side Cover Gasket - Fits Honda GX200 / Clone / Hemi 212

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

(2) GX200 / Clone Piston Circlips

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

ARC 6271 Billet Rod 3.323 +.020 Fits Honda GX200 Tillotson WildCat

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

Cylinder Head for Clone - HI COMP 14cc

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

Honda,Clone,Predator Head Gaskets 160cc - 212cc

www.doverpoweronlinestore.com

I'll use the stock dished piston with the connecting rod, they should both agree on .709 inch wrist pin.

I dont know what the new deck height will be with the longer connecting rod but if it adds +.2 at tdc then im guessing the new height should be .02 in. with a compression ratio of 10.6

Thoughts on buying the head gasket from dover power? The smallest width gasket I could find on OMB was .01 same with GPS.

 

[BrownStainRacing]

Alright I got the parts set up, hopefully this lil motor can turn out to be a beast

Side Cover Gasket - Fits Honda GX200 / Clone / Hemi 212

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

(2) GX200 / Clone Piston Circlips

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

ARC 6271 Billet Rod 3.323 +.020 Fits Honda GX200 Tillotson WildCat

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

Cylinder Head for Clone - HI COMP 14cc

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

Honda,Clone,Predator Head Gaskets 160cc - 212cc

www.doverpoweronlinestore.com

I'll use the stock dished piston with the connecting rod, they should both agree on .709 inch wrist pin.

I dont know what the new deck height will be with the longer connecting rod but if it adds +.2 at tdc then im guessing the new height should be .02 in. with a compression ratio of 10.6

Thoughts on buying the head gasket from dover power? The smallest width gasket I could find on OMB was .01 same with GPS.

I suggest
3 side cover gaskets.

Get a shimmed .027" head gasket. You can pull em apart to get .018" and .009". Then you will have extras.

Always get a new piston, rings, wrist pin, clips kit. Jus incase piston to cylinder clearance, and ring ends gaps are off. I start a build with 3 of each, minimum. Mess it up here, and it'll be a......turd.

Crank and cam shims. Look closely at the side of that rod in my pics. It's tore up on the sides. That came outta my 224 with only 3-4 break in hrs on it, before I shimmed the crank and cam. Shims keep everything nice and lined up, less heat, less drag and resistant = a faster revving engine.

Cam choice, stock or performance???

Valve springs gotta match the cam.

Valve spring shims. They set the pressure of the springs. The spring pockets in these heads are all wacked. Not enough pressure will cause valve float, too much pressure will wipe out a cam lobe.

What's the stamp letters on your rockers??? They are different.

And jus think......you jus getting started

 

[BrownStainRacing]

@atlantazombie
Here's the right way to take that gov gear out and plug the holes. Around 24:00

 

[BrownStainRacing]

@atlantazombie
Here's your old post.
Put up pics of your test plugs here.

Post pics of your ride and tune so others can see.

 

[atlantazombie]

Here’s the most current plug on my modified 196cc (NGK BP9ES) .

Currently running a .625in slide in stock style carb with .036 main jet, .020 pilot jet

The fuel/air idle mixture was 2 1/4 turns out from tightened

Let me know what needs to be changed to get it running healthier

 

[bob58o]

BP9ES is a really cold plug isn’t it?

I’m about to try a BP7ES plug with 15psi of boost.

I thought BP6ES was stock and thought it got colder as numbers go higher with NGK

 

[BrownStainRacing]

Here’s the most current plug on my modified 196cc (NGK BP9ES) .

Currently running a .625in slide in stock style carb with .036 main jet, .020 pilot jet

The fuel/air idle mixture was 2 1/4 turns out from tightened

Let me know what needs to be changed to get it running healthier

Doesn't look bad.
Maybe drop main down to a .035"

Where's your timing set at???
That color change on the ground strap should be in the curve.

 

[atlantazombie]

New and improved PCV system!

 

[BrownStainRacing]

New and improved PCV system!

Much, much better.

You can take that charcoal box off. Jus let the tank vent hose hang down the way it is. Dirt can't get that high up thur the hose.

The tank has a valve in it, so it shouldn't leak

Where is that other hose going to???, I can't see it.

 

[atlantazombie]

The gas passes thru the box and is sent out again thru to the airbox to get reburnt

 

[BrownStainRacing]

The gas passes thru the box and is sent out again thru to the airbox to get reburnt

You don't need it, but I don't see it hurting anything.

I thought it was jus hanging somewhere.

 

[BrownStainRacing]

@atlantazombie
Here's best pic I can come up with for that tach wire to plug wire.

My builds with SA bored carbs always has to have a 2000+ rpm idle, to get that snappy throttle response. If not they puff black smoke and sluggish off the line.

They're not rotor tiller motors anymore.

 

[bob58o]

@atlantazombie
Here's best pic I can come up with for that tach wire to plug wire.

My builds with SA bored carbs always has to have a 2000+ rpm idle, to get that snappy throttle response. If not they puff black smoke and sluggish off the line.

They're not rotor tiller motors anymore.

I just sent a message to Runleader to verify the CHT sensor works on a plug with 14mm threads. How do you like the temperature sensor / tachometer combo?

 

[BrownStainRacing]

I just sent a message to Runleader to verify the CHT sensor works on a plug with 14mm threads. How do you like the temperature sensor / tachometer combo?

Works great.

Tach don't have that delay in it like those cheap square ones do.

It turns on as soon as you start the engine.

Every time you turn the engine off, it will flash (5 times) the MAX rpm the engine turned in that session.

It fits 14mm plugs, that pic there is a 14mm plug.

You gotta turn it off, but I've left it on for days and it's still got the original batteries in it. I have had it for probably a year now.

 

[atlantazombie]

@BrownStainRacing I did some testing with the same jetting size and I don’t have numbers for amount of time to get from idle to WOT but I do have some qualitative information.

Based by adjusting the idle/air for highest idle, I get the highest idle rpm at 1.8 - 2 turns out, going from 2k at a little bit past 2 turns out to 2.5k at 1.8 turns before going back down in idle rpm.

Loosening the screw gets the engine sounding almost like it’s chocking out(this is at around 2.5 turns). I checked the plug after running it for not even a minute and it was completely fouled up, carbon buildup.

So unless I’m doing something wrong, it likes being leaner

RPM engagement of ~ 3000


*** One thing I realize is that there is a high possibility that the stock t/c on the go kart is a Chinese off brand***

I attached a video of WOT, turning max rpm of 5800, hopefully works

IMG_4798.MOV

drive.google.com