Reed Stoppers

**coffeeguy** · 01-14-2018, 09:34 AM

Is using reed stoppers a good idea for aftermarket(CCM) reeds on a 7000 rpm motor?

**wrechin2** · 01-14-2018, 11:17 AM

The reeds will only open so far. That is why mercury quit using them. Take a reed and blow compressed air into them. They will stand straight out and not bend over backwards. Just my experiences.

**ChrisCarsonMarine** · 01-14-2018, 11:48 AM

Some factory Reeds use stops, some don’t. You’re much more likely to break a read with a backfire if it doesn’t have a stop, Chris

**wrechin2** · 01-14-2018, 01:37 PM

IF you want some, I have plenty.

**FMP** · 01-14-2018, 01:54 PM

Turn them into dodgers or bling for big plugs

**ChrisCarsonMarine** · 01-14-2018, 03:15 PM

Generally speaking, I would ask what you have against reed stops? I tend to agree with James and that the reeds do not use the stops in normal operation, so it would seem they are unnecessary. However during a backfire the stops may keep a reed from breaking, Not a bad thing. Now, if you’re a fellow who likes to cut his crankcase front .050 to gain a 30 mL stuffing, realize that you will lose about 12 mL,By leaving the reed stops out, slightly over a third of the gain you got by the milling. Doesn’t sound good to me. As to the factory deleting them, they come on all the four and six petal cages, and do not come on the five,Stock or sport jet., Chris

**FMP** · 01-14-2018, 03:58 PM

I gained 60 rpm, just following instructions by manufacturer. I'll try yours and compare.

**H2OPERF** · 01-15-2018, 04:41 PM

I agree with chris, stack em all up together off the reeds on the bench and it looks like a big chunk of metal and makes you say hmmm... along with all the other metal you already hog out of a block trying to get it to flow nice.

**FMP** · 01-15-2018, 04:47 PM

We have an interesting thread going here call crankcase compression.

**H2OPERF** · 01-15-2018, 04:56 PM

Unfortunately omc's don't have much, I put big fr4 1/4in shaped/radiused blocks in my front and still put the stops in..

**phillnjack** · 01-15-2018, 05:32 PM

My question would be ... Why take the stops out ? what advantage would it be to run without them ? something ive not done in the past so would like to know.

" if " there is more chance of keeping the reeds intact during a back fire that is definitely a good enough reason to keep them.

what about a sneeze situation ? do the stops also help here ?

**coffeeguy** · 01-17-2018, 06:21 AM

Original reed blocks in the engine did not have them but I have some from an older motor.

**Chaz** · 01-17-2018, 08:37 AM

When I had my billet blocks made , my next stop was to the waterjet guy for some stainless reed stops . My reasoning was that if the reed is opening and closing at the anchor , the hinge point is very short compared to the pedal rolling around a radius .
I can't help but think that the reed will last longer as well as be much more stable with a little guidance .

**powerabout** · 01-17-2018, 09:33 AM

omc put shims under the reeds stops on several performance production engines

**H2OPERF** · 01-17-2018, 09:34 AM

Agree, was also told by a cart guy that bending at a even curve makes them recoil without flutter.. Sure is funny 2 stroke race bikes all came with them in.