Hello,
While I'm posting stuff here are a few pictures of broken parts from two blown 115cc high compression engines, before I figured out the balance between extreme performance and reliability.
As we say down South;
Bless your heart, I do hope you learned something from this _________________ DRIVE IT LIKE YOU STOLE IT!!!!!!!!!
DAZON 150 SINGLE SEAT
2.5inch rear wheel spacers
1.5inch front wheel spacers
UNI, 130jet, BIGE built intake tube, custom built exhaust, HO coil, adjustable CDI, iridium plug
Hello,
While I'm posting stuff here are a few pictures of broken parts from two blown 115cc high compression engines, before I figured out the balance between extreme performance and reliability.
Pete
OUCH!!!
I guess that extreme performance was AWESOME for the three seconds it lasted... just wow. _________________ Spyder 250 (KTR-250W, or GK-29)
Blue (Polini) main Spring
17g Sliders
White clutch springs
UNI filter / 130 Jet
Could be pre ignition aka detination too... Too high a compression not high enough octane fuel. Fuel ignites before tdc blows a hole in piston shrapnel from piston breaks valve before engine completely stops. You can also detinate a stock engine by running too lean. _________________ Darren,
Buggy Junkies
Too much power is almost enough!
The pictures are from what I like to call the "experiment phase".
13:1 compression. The larger cam, valves, tight clearance and high revs caused a valve to float even with a stiffer spring thus exploding engines, way cool!
I have around 50 hours on each 115cc big bore kits now and they are incredible strong.
I shaved .0040 off the pistons to lower the compression a bit.
114cc Bore Kit, Race Head, Mikuni VM26 Carb/Kit and Race Cam for 86cc through 107cc Engines:
- NEW Race Head – Larger valves (now 25/22mm) and better flow for increased performance. Also has bigger cooling fins. Includes all necessary parts and comes assembled!
- High performance race camshaft
- Lightweight aluminum cylinder with steel sleeve (huge weight savings over your stock cast iron cylinder)
- Cast in mounts on cylinder for aftermarket skid plates
- Oversized cooling fins on cylinder for efficient heat dissipation
- High compression 54mm piston with rings, pin, & clips (replaces your low compression dished or flat top piston)
- Head gasket kit
- Genuine Mikuni VM26mm Performance Carb
- Intake Kit for the Race head
- Jet kit with 3 different sizes (Stock size is a #195 - Extra jets sizes of 155, 165 & 175)
- Throttle Cable
- NEW Dual Layered Foam Air Filter (not shown in pic)
This kit is the complete kit to convert your stock motor into a powerful open class 114cc engine (much more powerful than the stock Chinese 107 and 125cc engines) with tons of torque! Our Race Head has bigger valves and better porting over the stock Chinese type E22 head. The head also allows you to use all cams made for the Honda engines so there is a greater variety of cams available based on your preference or type of racing.
This kit will work on all 86cc through 107 Chinese engines except models with a 3 valve head (3 valve Chinese heads typically have different stud spacing).
We recommend purchasing a high volume oil pump kit (available in this section).
Installation Note: It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal).
See the Performance Info section for additional information on our performance parts
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