Engine Conversions Discuss all aspects of engine conversions in this forum

Choise of carburettor

Reply
Old 05-23-2006, 12:51 PM
  #1
jmj
Thread Starter
 
Join Date: Feb 2003
Location: Tromso, NORWAY
Posts: 33
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Choise of carburettor

I have several engines to be converted;
3 Toro 25 double barrel
1 Toro 25 single barrel
1 Weedeater 21cc
1 Stihl 40CC

I want to replace the carburettors on all engines, i dont want to mess with rebuild kits.
I want all the 25cc and the 21cc to use the same type of carb.
I guess the 40cc will need a bigger carb.

I do not know much of carburettor models and numbers, so i want some input of what carbs i can use.
It should be a well known type that is easy to set up, and with 2 needles.

Thanks.
jmj is offline  
Reply With Quote
Old 05-23-2006, 01:52 PM
  #2
Rcpilot
 
Join Date: Mar 2002
Location: Arvada, CO
Posts: 7,732
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor


Quote:
ORIGINAL: jmj

I have several engines to be converted;
3 Toro 25 double barrel
1 Toro 25 single barrel
1 Weedeater 21cc
1 Stihl 40CC

I want to replace the carburettors on all engines, i dont want to mess with rebuild kits.I want all the 25cc and the 21cc to use the same type of carb.
I guess the 40cc will need a bigger carb.

I do not know much of carburettor models and numbers, so i want some input of what carbs i can use.
It should be a well known type that is easy to set up, and with 2 needles.

Thanks.
You got money to burn?

A rebuild kit is about 1/4 the price of a new carb. And it's not rocket science to put the kit in the carb. If I can do it, anybody can do it. Trust me.
Rcpilot is offline  
Reply With Quote
Old 05-23-2006, 04:40 PM
  #3
jmj
Thread Starter
 
Join Date: Feb 2003
Location: Tromso, NORWAY
Posts: 33
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor

No, but the original Toro carbs is no good, so the must be changed.
The weedeater carb is a 1 needle thing, it works, but i guess i will get more power with a bigger carb.
The 40cc carb is the oonly one i can use as it is.

JM
jmj is offline  
Reply With Quote
Old 05-24-2006, 08:44 AM
  #4
BillS
 
Join Date: Sep 2004
Location: Greensboro, NC
Posts: 3,312
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor


Quote:
ORIGINAL: jmj

I have several engines to be converted;
3 Toro 25 double barrel
1 Toro 25 single barrel
1 Weedeater 21cc
1 Stihl 40CC

I want to replace the carburettors on all engines, i dont want to mess with rebuild kits.
I want all the 25cc and the 21cc to use the same type of carb.
I guess the 40cc will need a bigger carb.

I do not know much of carburettor models and numbers, so i want some input of what carbs i can use.
It should be a well known type that is easy to set up, and with 2 needles.

Thanks.
Simply buying and replacing carbs will not solve many problems. You will be disappointed. To be successful with conversions it will be necessary to understand at least the fundamentals of how the carb works.

Bill

BillS is offline  
Reply With Quote
Old 05-24-2006, 08:53 AM
  #5
jmj
Thread Starter
 
Join Date: Feb 2003
Location: Tromso, NORWAY
Posts: 33
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor

And how do you know i dont?.
If a carburettor is not suitable for using in a converted engine (Toro), it will have to be replaced with another type.
JM
jmj is offline  
Reply With Quote
Old 05-24-2006, 09:46 AM
  #6
BillS
 
Join Date: Sep 2004
Location: Greensboro, NC
Posts: 3,312
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor

Quote:
And how do you know i dont?.
Never said you didn’t know.

Bill
BillS is offline  
Reply With Quote
Old 05-24-2006, 12:03 PM
  #7
davewallace
 
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,402
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor

Hi JMJ,
The most common carbs here in the states are Walbros. The 25cc engines run best with 11mm carbs. The smaller engines may like a 8 to 10mm better. The 40cc can use a 11mm, 12.7mm or a 13.49mm. I am goung to try a 12.7 on mine, but I'm sure that it would run just fine with the 11mm or 13.49mm. Just about any two needle Walbro carb of the above sizes will work fine. You should be able to get some good deals on E Bay or RCU classifieds. The venturi size is what you are concerned with. This size is cast into the venturi enterance on Walbro carbs in 64ths. 28/64ths equal 11.1mm. Some models have have builtin choke and others have a builtin promer bulb with an extra fuel connection. I don't have any idea of how much thw taxes would be. I know that you folks pay a lot up there. I like the WT-324 for a 11mm carb because I bought several new on ebay for $30. Good luck.

Dave
davewallace is offline  
Reply With Quote
Old 05-24-2006, 12:10 PM
  #8
tim220225
 
tim220225's Avatar
 
Join Date: Jan 2004
Location: Mobile, AL
Posts: 1,005
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor

I have done many Echos and a couple of Toros. The carbs that work best on up to about 25cc is a 9.54mm carb, I have tried bigger but no real difference. 40 to 50cc engines I use a WT-201 and it has a 13.4mm venturi. Look at some of my recent past posts, I have plenty of information on this issue. Good luck.
tim220225 is offline  
Reply With Quote
Old 05-26-2006, 08:31 AM
  #9
jmj
Thread Starter
 
Join Date: Feb 2003
Location: Tromso, NORWAY
Posts: 33
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Choise of carburettor

Thanks for all replies, lots of good info.
Now, i have to search eBay...

JM
jmj is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 08:50 AM.