andrew66

hey, im just getting into the final stages of my homelite 25cc conversion. so far i have done some grinding on the transfer ports to allow more flow (not change timing) and ported the crankcase to better match the transfer ports. i also stuffed the case, milled .020 off the case and raised the intake port to compensate for the lost exhaust duration.
I will be running this on GGL and was wondering if a glow carb (OS or Supertigre, dont really care) would work out alright. also, is there a fuel pump i can use so i can put the tank on the CG of the plane?

davewallace

My Feedback: (29)

Andrew,
Why would you want to replace a carb the does it all with one that needs to be helped? A glow carb would be a good idea if you were running 100% glow fuel. GGL will allow you to use a great pumper carb without modification. A perry pump for gas may do the job with the glow carb. You may have touchy need settings.

Dave

andrew66

my engine did not come with a carb, and to buy one new here is expensive ($100) ive looked for used ones, but have found nothing. i figured that if a glow carb and pump are close to what i would normally pay for a walbro, i should try it. the glow carbs also are able to be adjusted more than a standard walbro. i figured that if i was running ggl, the extra flow and range of adjustment would help me get every last ounce of power out of this engine.

tkg

My Feedback: (1)

A ST carb ff a 2500,3000,3250 would be OK. You would have to make some sort of intake manifold to make things work right.
A Perry Pump or the Kline Regulator System would let you move the tank a bit.

captinjohn

I used a sanding drum from my dremel and placed it in drill press and sanded the manifold that came with Homelite 25cc. A real tight fit can be made. Just go slow and check fit often. Capt,n

andrew66

did you use any type of fastener on the carb? i would hate to have the carb come loose in the air

captinjohn

Silicone rubber will seal and hold it ih there. Clean all oil residue off first. Capt,n

andrew66

ok. what kind of RPMs and with what type of prop can i expect? how about the throttle response? how does the glow carb "stack up" compared to a walbro?
I would also like to try a carb off a 2300 but am afraid that it will be too big.
sorry for askin all the questions, but i got to know all the facts before i place an order at the LHS.
thanx for your time,
andrew66

av8tor1977

My Feedback: (6)

Sorry, but I've got to jump in here and say that I really think you will be happier with a Walbro. One with an 11mm venturi would be the best for your engine. The cost of a new glow carb, and the pump/regulator you are also going to need will be much more than a Walbro carb from one of the suppliers here in the forum, or they can also be found on e-bay. With a little searching, it's not hard to come up with a Walbro for around $20.00.

Personally, I wouldn't think of using anything but a Walbro carb on my engines, and mine are all hopped up and they scream.

AV8TOR

andrew66

if i cant find a walbro with an 11mm venturi, would it work to drill it out to 11mm (or close to it).
what are some of the model numbers that i should look for?
thx,
andrew66

jrjr2u

http://www.rcuniverse.com/forum/m_23...tm.htm#2371019

captinjohn

Andrew66: The Supertiger carb I used on my 25cc Homelite was for testing only on a test stand. I wanted to use strait glow fuel and other mixes like gas/glow. But to make the Supertiger carb work in a airplane, it might be more expesive than getting a regular pump carb like a Walbro. The pump carbs are the most easy to use and set-up for flight. You should be able to find a good used carb at a repair shop...just got to find the right place. Complete engines are thrown away every day...with lots of good parts on them! Capt,n

andrew66

hey, its me again, so far ive called countless shops, and have gotten nowhere! every time i talk to someone, they just beat around the bush and tell me that they will call me back, and never do. some guys insist on the part# of the trimmer, and i tell them what im using it for and give them a part# for a carb (off the link that was posted) and they still wont help me! ive tried asking for new and used carbs, but i guess my business just isnt valued around here. guess i have to wait for one to come up on ebay....

Antique

My Feedback: (4)

Many years ago there was a small Chinese twin engine called a TwinStar..Not a bad design, but really bad castings and workmanship...It used glow fuel..The carb was a small Walbro made for Stihl equipment, but worked well on glow fue...Walbro won't sell the carb, it has to come from Stihl...It would work fine on the 25cc engines, either gas or glow fuel...Send me $20 and your address, I will send it to you...If it doesn't work you can send it back....
Maybe I'll take one apart and take some pictures, it's unique..Opposed twin, piston port with one carb, came with a rope and pulley to start it...

remote59

My Feedback: (2)

Andrew go to ebay and type in zama C1Q I bought one they are new ,
put mine on a ryobi 31 but I just checked for you and it fits homelite also.

captinjohn

RCIGN1: Post a photo of that old chinese Twin called a TwinStar. Was it sold by Indy RC back around 1970? Thanks Capt,n

andrew66

what size of venturi does that walbro have?