Gasbike.net Grubee GT5 w/high compression head issue

I noticed some of you are ill informed as far as what grube does with those warehouses full of years past models meant for US shores that could not get shipped here due to ever changing EPA regulations . they find loopholes , list them as " off road use only" and leave off the ID plate , they then wholesale these older grubees to companies here with an agreement that they NOT sell them under the official grube name , for example : Fastbikemotors.com sells the grubees with 38 mm stroke , long rod , type b piston , exaust ports are 40mm , but the intakes are 32 mm, also bicycle Motor Works sells them too , the guy that runs kings and gasbike got in trouble years ago with grubee for selling older , non tagged motors under the grubee name
Actually it seems you may be ill informed as to whats what,The Grubee engines are produced in lots with an extra percentage to cover defective parts and pre sold prior to production.In this day and age and especaily the Chiness no one goes into production to sit on the product.In 2010 when the epa changed it's rules for importers to be responsible for meeting the standerds set out by them along with the manufacture things changed and grubee commisioned Jin Ling to produce their star fire line and the supper rat and mouse engines to be able to ship to N.A. under China Gas's epa clearence.Then Jin Ling witch is the parrent company to what is now known as Zeda technoliges started making engines on their own first using the older style case halfs then implemented suttle changes to make it their own.Jin ling is parented by China Gas do you see where this is going? This is from Grubee's old website,
As of 2010 until present day Sept 2012, YuanDong SkyHawk is the only EPA certified 40CFR-1051 supplier in China. via Importer on Record, Nationwide Access in Van Nuys, Ca. EPA requirements starting in 2010 have both the US importer on record and the China engine manufacture both involved in EPA certification. Meaning the EPA certification process has changed and now involves the US importer who must be responsible to EPA as well as being responsible for what the engine manufacture does. Before 2010 EPA had no way to legally enforce their rulings at off shore bicycle engine factory locations so in this way EPA has control by making the USA Importer on Record totally responsible. This can be a good change but without clear communication from EPA officials and a trusted contracted fiduciary agent in China this new process is unthinkable and not very workable.
China GAS plays an important role as fiduciary agent and licensed exporter. EPA Certification for bicycle engines can no longer be obtained in China as was done in years past. This new process of having both the engine and importer approved is time consuming and very costly, approx. $25,000 to $30,000 for 190 hour lab test plus EPA filing fees and your involvement time. Conversely a 4 cycle lawn mower engine can still be EPA certified in the name of the China OEM manufacture who made it. WARNING: Do not order 4 cycle engines from China kit suppliers, only buy these engines direct from Huasheng the engine manufacture. HuaSheng 4 cycle engines should not be shipped with bicycle installation kits due to having the wrong class of EPA COC. Chinese gate keepers do not understand EPA laws and will tell you anything you want to hear to get your money then go silent.
BEWARE: It has been noticed that some unscrupulous importers in the USA are still bringing in the 2 cycle bicycle engines EPA certified as lawn mower replacement engines which only requires simple Class 90 certification. EPA officials have repeatedly told us this is totally illegal and they plan to stop it. Laws without enforcement can be worst than no laws at all. The fact is unscrupulous test labs as well as some unscrupulous Importers have falsified test records to enable this to happen. So beware if you run across this situation. Contact EPA enforcement division for latest details.
To this date Sept 2012 StarFire factory has not gained a WD partner in the USA willing and able to pay the cost of obtaining EPA 40CFR1051 certification and take total responsibility. This means the StarFire line is open to the first qualifying IMPORTER willing and able to perform. Let it be clearly understood that No SuperRat or SuperMouse shipments can go to the USA until a 2013 EPA COC for 40CFR1051 has been issued. Contact EPA enforcement and compliance at 734 214-4100 and 202 564 2063 for latest details. www.epa.gov
The engines Gas bike and others sell are Not older grubees The factorys that were commisioned to make the engines make suttle changes and did their own production run with no epa certification and offered them to the public for offroad use in N.A. with the vendors taking the chance that the shipment may be seized.
 
Acually , i do know that ,
In talking about motors built between 2008 and 2014, there are tons of unmarked grubees around being sold as "jett" "jeet" or black stallion , they are grube motors , minus the id plate , all of fasbikemotors.com motor kits are all grubee , the upgraded carbs are yaung dong cns carbs , the cylinders are easy to identify as well
 
They were shipped in parts bro , thats why half the time the heads blow , unless the vendor knows what hes doing
 
I bought from gasbike, 3 motors from fastbike , one from bmw
All five were grube motors , the rods on all 5 motors were ZAE 80
Not very common either , but a grube for sure
 
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Acually , i do know that ,
In talking about motors built between 2008 and 2014, there are tons of unmarked grubees around being sold as "jett" "jeet" or black stallion , they are grube motors , minus the id plate , all of fasbikemotors.com motor kits are all grubee , the upgraded carbs are yaung dong cns carbs , the cylinders are easy to identify as well
Fastbikemotors engines are low pin piston and short rod not a Grubee engine.Jet engines also not a Grubee they also use the low pined piston and short rod I've had many of them here at my shop, Zoom bicycle engines in B.C. Canada sell these they too self labled them currently.And they were shipped overseas as a complete bottom end and the top end in a seperate box in the same package as again I had received many that way.All Grubee engines since 2010 have long rod, high pinned piston,wider front mounts and the cylinder is almost 1mm taller.
 
No they are not
Fastbike sells short stroke long rod motors. , i got one in front of me from gasbike , same rod same everything , ill take the head off and take a pic
 
These are the black motors i got from fastbike , i bought 3 , all black all same rod , gas bikes was a silver jett i ordered, but recieved a silver motor identical down to the rod as the motors i got from fastbike.hardware, transfer ports in the cylinder were angled , long clutch arm , they all had a 32 mm intake and a 40 mm exhaust
Con rod on all of them was the same
ZAE 80
 
Fastbike black , rod ZAE 80 , short stroke , long rod , 32 intake 40 mm exhaust port
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FB_IMG_1507842139482.jpg
 
I bought from gasbike, 3 motors from fastbike , one from bmw
All five were grube motors , the rods on all 5 motors were ZAE 80
Not very common either , but a grube for sure
Z-L & ZL Rod = 40mm / Type A Piston – PK Type (Caged and Non-Caged) *

ZL E80 Rod = 40mm / Type A Piston – PK Type *

ZL40MM Rod = 40mm / Type A or B depends on cylinder – Overcut journal = junk.

Zeda 80 Rod = 40mm / Type A or B depends on cylinder – Overcut journal = junk.

FM80 Rod = 38mm / Type B Piston – GT5 Type *

F80 Rod = 40mm / Type A Piston * Use #2 B w/ 41mm tall cylinder – GT5 Type

ZAE 50 Rod = 38mm / Type A Specialized crank setup.= 38mm / Type A Piston – PK Type *

ZAF80 Rod = 38mm / Type B Piston – GT5 Type *

No Mark Rod = 40mm / Type A Piston – PK Type (Caged) *

SX-OP = 111.47 mm (Overall) ?????

ZAF 60 Rod =

ZAE 80 = 40mm / Type B Piston – GT5 Type * Double check piston!

ZMN = 38mm / Type A Piston – Halfbreed type * Always double check

JSF50 =

CY Rod = 38mm / Type A Piston – Halfbreed Type

ZAF 50, ZAF 60, and ZAF 80. The higher the number, the longer, and therefore heavier. You can run a pk piston in a gt5 as long as the con rod has z-l on it or zaf 50 not the zaf 60 though and yes the jugs are different the biggest visual difference is the gt5 usually has a tapered transfer port window.

The A80 engine uses a long ZL rod that is counter sunk at the bearings and is not heat treated. This engine uses a type B piston

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Grubee Skyhawk GT5SR Super Rat Angle Fire 66cc/80cc
Front mount diameter (40mml/1.57in)
Rear mount diameter (32mm/1.26in)
Integrated CDI Ignition Coil
Timing key way cut at approx. 3:00 TDC
17mm Crank – Larger key way @ magnet
6203 Crank Bearings
Z-L 115mm / 40mm Stroke
Type A Piston – Top end con rod needle bearing – 10 x 14 x 13

GT5A and Super Rat 66cc use the same piston.

66/80cc Piston #2
Only compatible with the Flying Horse Bike Engine Kit*

Piston Measurements:
Height: 49mm
Width: 47mm
Skirt Width: 19mm
Skirt Height: 5mm
Piston Pin Port: 5mm
Height from Skirt to Piston Pin: 5mm

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66/80cc Piston #4
Compatible with most Grubee Skyhawk Bicycle Engine Kits*

Piston Measurements:
Height: 50mm
Width: 47mm
Skirt Width: 23mm
Skirt Height: 10mm
Piston Pin Port: 10mm
Height from Skirt to Piston Pin: 5mm

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66/80cc #5
This piston fits most 66/80cc Flying Horse, Mega Motors, and RAW* engine kits.

Piston Measurements:
Height: 50mm
Width: 47mm
Skirt Width: 19mm
Skirt Height: 11mm
Piston Pin Port: 5mm
Height from Skirt to Piston Pin: 7mm

Bearing Reference:

NTN 6202LLUC3/5C

Malossi racing top end con rod needle bearing – 10 x 14 x 13
 
The silver " jett " i got from gasbike was exactly the same motor , same rod , except the exterior was beat to s**t , inner parts and cylinder was fine, fastbike even sent me a yd carb
 
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