Return to the Tool Shed Forum | Post a Follow-Up

 o
stihl br430

Posted by paulga (My Page) on
Sun, Apr 22, 12 at 16:00

i just purchased this backpack blower. the man at the dealer told me this has a 4-mix engine but i think he is wrong . the br420 had a 4-mix but this newer model br430 i don't think has it.i think it is a regular 2 cycle anybody know for sure thanks


Follow-Up Postings:

 o
RE: stihl br430

What is a 4-mix engine? Do you mean a 4-cycle engine?
Check it carefully! see if it has a place to put oil into the engine block, such as a screw in/on cap, and a dip-stick. This usually denotes a 4-mix/cycle engine.
A 2-mix engine would say to me that you should mix a certain amount of oil with the gasoline, ala 2 cycle engine. A 2 cycle engine doesn't usually have a dip-stick!
The terms you have stated don't mean much to us older mechanics. Is that something you have heard from the place where you bought it, or from somebody who is new to the trade? Better check with the seller, before you do something wrong, and end up with a useless piece of equipment that said:"BANG"! right after you tried to start it! Haste makes waste!


 o
RE: stihl br430

Paul,

The BR430, is NOT a 4-mix engine nor is a BR420 either.

Both of these are a pure 2-stroke engine just like the BR420. The only difference is the engines...the BR350/430 models have a stratified charged motor (it is essentially a large version of the BR200/BG86 engine) vs a single on the 420.

The only blowers with the 4-mix are the BR550,500 and 600


 o
RE: stihl br430

Rusty,

A 4-mix engine is a STIHL patented 4 cycle engine (has valves,cams, lobes that 2 cycle's don't have) but uses 2 cycle gas for lubrication purposes. Those engines do NOT have oil sumps.

They are essentially a hybrid 2/4 cycle motor, they've been around for at least 10 years or so.

If you familiar with STIHL's FS90, 110, 130 trimmers and BR500,550 and 600 backpack leaf blowers...those are your 4-mix motors...they sound different than regular 2-cycles.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Tool Shed Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here