Anyone around the midwest (1500' field elevation) install the 105 HP Zipper kit and have to change the jets or setting on their carbs. Mine sure seems to run very rich. Possibly bad floats? Guessing it is time to take the cowling off again.
Anyone around the midwest (1500' field elevation) install the 105 HP Zipper kit and have to change the jets or setting on their carbs. Mine sure seems to run very rich. Possibly bad floats? Guessing it is time to take the cowling off again.
Throw all the floats on a drug dealers scale and see what each one weighs. I had a sunken float and my engine was running so rich I thought my EGT probe quit working. $150 for a set of floats from CPS and all is well again.
Dave
KitFox 6 Taildragger
912 ULS
Whirlwind 70” Prop
Garmin G3x
All around nice guy
Dave,
I got rid of my drug dealer scales after I testified and they put me in the witness protection plan! I'm going to use my postal scale, will that work the same? LOL
All joking aside, I was thinking it might be the floats. I had them out recently and weighed them but thought they were good. I'll have a better look this time. Thanks!
Removed cowl and both sets of floats. They are basically at the maximum+ weight for the pair. My postal scale didn't quite seem consistant so I use my powder scale....no, not for that kind of powder...the one I use for reloading ammunition. It measures in Grains and I converted it to Grams.
Weights are:
#1 4.328
#2 3.648
#3 3.427
#4 3.226
Thinking that I should be replacing them. Now to find them in stock!
I read awhile ago that MS was making them also. Anyone tried them?
Last edited by WWhunter; 07-13-2020 at 04:37 PM.
According to Hal, you should jet and tune the carbs as you would a standard 100 hp ULS engine. Also switch to the DCPR8E spark plugs. I prefer to gap at .021-.023" for better starting.
Checked on the MS website and they are making the Rotax Carb floats again. $165 for a set of two.
May buy some just to have on hand for when the Rotax floats go bad.
Rodney
Yes sir, using those plugs and gap.
I found an old set of floats in my hangar and weighed them. All 4 were about 3.2 grams. I can't remember if I replaced them when I rebuilt the carbs due to being heavy or just did it because I had new ones in the rebuild kit. They may have been heavy and have dried out after sitting on the shelf. I'll let them soak in some fuel for a few ys and see if they gain weight.
Probably just smarter to order new ones from MS. I did call them today and as has been mentioned, they have them available again.
Marvel Schebler, Jim.
I've read of issues with those floats also... I hope that's not the case still. Maybe that's why they were off the market for awhile? I also read that the floats were coming out of the factory at a pretty high weight to begin with... actually higher than the acceptable weight limit for the Rotax ones, but I can't personally confirm that. I'd recommend some current research, & let the buyer beware.
John Evens
Arvada, CO
Kitfox SS7 N27JE
EAA Lifetime
Chap. 43 honorary Lifetime
Re: Marvel Schebler floats - it is a little troubling to me that there doesn't seem to be much technical information about these floats on their website. What's there is a couple of years old and published before the "problems" that I read about had surfaced. For instance, I can see no information about what their floats weigh, or should weigh. Has anyone on this forum purchased some of the currently available ones and checked their weight?
John Evens
Arvada, CO
Kitfox SS7 N27JE
EAA Lifetime
Chap. 43 honorary Lifetime
Jim, CPS has none of their kits in stock as do most of the other resellers of the Rotax floats. Lockwood may have them but they are more expensive and the price is close to what MS wants for theirs.
I spoke with Mark at MS yesterday. I asked about improvements done to their floats since they first were put on the market and if there was any warrentee.
He said he thought they had a 2 year warrantee as al their floats do and the weight will be under 7 grams for the pair. Price is $165/pair.
In other news...I had an old set that I removed awhile ago that I decided to weigh. All four were 3.1-3.2 grams. I don't recall if these were bad and possibly dried back out from sitting on the shelf or if I just replaced them since I bought a complete carb rebuild kit with new floats.