Grpro 100cc twin. or?
 

Hi!

Ordered a Grpro twin, and got it home today. If this is one of the "good" chinese engines, i realy wonder how the bad ones are. But im a bit confused....

The one positive thing i could tell, is the carb. Walbro made in japan. looks nice.


The engine had a bit gasoline in it, and have aparently been used. (Tested?). Well, the carb is totaly unused.

No name on the engine, i have seen in other threads that the engine comes with Grpro on it. That makes me wonder why mine dont...

The engine looks like somting that came out of a dogs xxxxxx.

looks like they had a bit of a problem getting some of the bolts in. They have grinded of the bolthead to make a fit in the hole that it goes in, so mutch that it now has paperthin wals. som pics of the bad bolthead, and a good one.

RE: Grpro 100cc twin. or?
 

While the subject of "good" chinese engines has many varying views... GRPro has not to date been grouped in with the better quality chinese engines.

You would probably be better to send it back... I think you will be happier in the long run.

RE: Grpro 100cc twin. or?
 

If you have the ability, you might be a lot better off to return the engine for a refund. I'm not going to go into engine details about the GRPro, but there's still some room to improve with this one.

This may be of help. A couple of months ago I tried out a RCGF 100 twin. It had a few issues but they listened and have incorporated quite a few improvements. They added bearings to the wrist pins and made some other modifications to make the engine more user friendly. It started out with some very nice basics. It has an excellent crank, very nicely machined case that's well matched to the cylinders, uses a Huskvarna clone carb made by a company named "Emas" in China that exactly clones all the chainsaws, and generally is pretty well made.

The one I have was sent out for minor modifications to improve the performance. Information regarding those improvements was provided to RCGF for them to incorporate into their production process. Engines having those improvements should be just about on the market now, or very soon to be. Overall it should be a very nice bargain priced 100cc twin, weighing 5 lbs, 3 ozs, making it the lightest 100 available that I'm aware of. Pricing may be comparable to the GRPro that you now have, but I'm not certain of that.

My engine is currently turning a 3W, 26-10 prop at 6,400 rpm and it has a ways to go before break in will be complete. Some other modifications will be tried to see if even more can be done with the engine, but those are limited to simple carbueration mods that anyone could do.

Contact Andreas at: [email protected], ++-261-81-129-4050, for particulars and availability. You'll have to copy and paste that info to a folder since it was not "linked".

This should turn out to be quite an engine and well worth researching further.

RE: Grpro 100cc twin. or?
 

I want the new Grpro 100l.

looks nice

I havent started the one i got. I dont need to. There is no way i can get the bolts on the prop to enter. Sparkplugs wont flush with cyl head. Bolts for the carb was missing also.

what a mess:(

RE: Grpro 100cc twin. or?
 

Your picture is a duplicate of the RCGF 100.

RE: Grpro 100cc twin. or?
 

For professional and ethical reasons, I won't chime in on the quality of the GRPro engines but I will state the following.

Unfortunately a "not so ethical" person used some RCGF pictures to advertise his products. If you look at the cast carb mounting spigot on the photos of perche's actual engine you will see that they are in fact a different engine.

I have inside knowledge that this issue has been the subject of discussion between the two manufacturers who are located in the same Province here. It is also a driver for changes to some markings on the RCGF product.

RE: Grpro 100cc twin. or?
 

wow.

RE: Grpro 100cc twin. or?
 

HI!
Thanks for the help:)

So u are saying that the engin on the last picture i posted isnt a GRpro?

RE: Grpro 100cc twin. or?
 

You are correct. Unless GRPro suddenly started making what appears to be an exact duplicate of an RCGF 100cc bottom induction twin. The picture in the first post is GR, but not the pic in post 4.

Send a pm to Aussiesteve. He'll put you in touch with Driesbabe in South Africa. Good exchange rates and a real good person to deal with. I have a previous version of the 100cc RCGF and after upgrading it with improvements now standard in the current version it will toe the line with pretty much any 100cc twin out there.

RE: Grpro 100cc twin. or?
 

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RE: Grpro 100cc twin. or?
 

Definitely Not the same engine.

Unfortunately, both companies are in the same Province in China. (Zhejiang) the (a lot) less ethical of the two alludes to people that they are the same engine - I can assure you that they are not. Unfortunately, that same company also uses the other companies photos in his advertising.

At one time they did use some common unfinished castings for the older models of 45cc and 65cc engines. As did a few other manufacturers. That has not been the case for quite some time.

RE: Grpro 100cc twin. or?
 

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RE: Grpro 100cc twin. or?
 

Is it Rear Induction or Side induction?


If possible - take off one cylinder and look to see if it has rollers or bushes on the connecting rod.

Due to significant improvements being made to their product lines, The RCGF factory recently sold off their entire stock of early model engines to a 3rd party "generic brand" dealer (you might be surprised at how often that happens amongst some of the manufacturers). It is possible that they have fallen into the hands of others who are now selling them as their own brand.

All Current Model RCGF Engines have the RCGF Trademark and a Serial Number. That was only instigated about a month ago.

RE: Grpro 100cc twin. or?
 

Hi!

It is a side induction engine. Same mufflers, same ignitione, same carb-a Rcgf engine. Having som sudden death issues. not sure if it is a falty ignition modul. i wil take off one cylinder and see if it has rollers. my gues is not.. i am doing this tonigth.

Im quite happy with the engine turning 6200 with the metz 28/10. Realy looking forward to leaning it.

Edit: sorry, i am using a MEJZLIK 28X10:D

Is it possible to put rollers on it if their not there?

Thomas

RE: Grpro 100cc twin. or?
 

Ok
No need to open it up - all of the earlier side inductions had bushings.
It is possible to retrofit the roller fitted connecting rods to the engine

The sudden death may be caused by the ignition module
It may also be caused by the spring on the carby diaphragm being too strong. There was a batch of the carbys delivered with that problem. It simply caused them to stop pumping just when you wanted it to pump.

If it is in fact the exact same engine as the earlier RCGF side induction, they aren't a bad engine, I run one here myself, but the rear induction roller version is even better.

RE: Grpro 100cc twin. or?
 

my first thougts was that there was a fuel stop. Have too dig deeper if the problem starts again. But i have tryed a walboro, and the same thing happend with it.

Can i put the rollers on the existing rods?

Thank you for your replys!

RE: Grpro 100cc twin. or?
 

Peche,

What sort of Ignition is it, dose it say RCexl on the ignition? Also, look at the date sticker of the ignition (Assuming that it is a RCexl ignition, it should have a date sticker) This will give you an indication of how old the engine acctually is.

Is the ignition fitted with a Blue or red sticker?

regards
Andreas

RE: Grpro 100cc twin. or?
 

The date is april 2008 , and i think it was blue.....im at work now, have to se when i get home to be sure..

RE: Grpro 100cc twin. or?
 

If it's blue and it dose not say RCGF, then you have a GRpro Ignition, according to Mr Wang, the worlds best ignition, the problem being they don't work. They are pretty to look at though. Thats more than likely the problem with the engine being dead.
Regards
Andreas

RE: Grpro 100cc twin. or?
 

I have a grpro ignition on another engine, Crome and blue letters. The that i got on the new engine is the same as the rcgf

RE: Grpro 100cc twin. or?
 

Ok ,home now. The sticker is red and says Rcexl on the ignition. So its not a Grpro. Made in april 2008. with a serial nr too:)

Thomas

RE: Grpro 100cc twin. or?
 

Perche,

That engine you have was sold by Alfonso Wang. I have [2] of them with bad crankshafts. They are both New engines
and the cranks went bad test running them before I sold them. The GR PRO by Alfonso Wang have bad cranks in them and he will not make good for them. He told me he does not sell that engine anymore, so I am stuck with [2] GR PRO 100cc engines. I sent one of the cranks to Ralph Cunningham to see if he could do something with it, and his comments were "I have never seen such a terrible welding on them and they are JUNK" So here I sit with [2] 100cc engines that are junk because Wang will not make good for the cranks. IS THAT SERVICE!!!!!! So I am out about $1000.00. So think twice before you buy GR PRO ENGINES.

RE: Grpro 100cc twin. or?
 

Mistydee0:

Do you refer to the blue engine? I have the new one 100i twin.

The first i had was trash, 2 mounting bolts on the engine snaped off. Horrible engine.

But i realy like the new one.

Thomas

RE: Grpro 100cc twin. or?
 

Im pretty sure that my ignition is the problem. engine runs nice , then, it stops, starts, but stops.

I have a inition from a Roto 50cc twin, can i use it on the 100?

Thomas

RE: Grpro 100cc twin. or?
 

Check and see how far the maginate go past the sensor at TDC, If it on goes about 3mm it will not work, I think the Roto is time at 3mm BTDC Most of the engines from China are timed at 28-30 deg before top dead center

Milton