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Search: Posts Made By: Timbers
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Forum: Gas Engines
11-26-2023, 12:44 PM
Replies: 303
Views: 54,597
Posted By Timbers

Does yours take a few mins to come up to full...

Does yours take a few mins to come up to full RPM? Mine usually requires at least 3-4 minutes of revving it up on the ground before the bottom cylinders light. It makes a lot of black gunk during...
Forum: Gas Engines
11-26-2023, 10:28 AM
Replies: 303
Views: 54,597
Posted By Timbers

Yes I get lots of black crap coming out of the...

Yes I get lots of black crap coming out of the exhaust. Its even on the grass during my runups before I fly. I ended up getting some silicone tubing the same size as the exhaust port so I could...
Forum: Gas Engines
11-12-2023, 07:37 PM
Replies: 303
Views: 54,597
Posted By Timbers

Black Goo

Look at the photos I posted a few posts up. I have black splatter on my firewall when I'm done with a couple flights for the day. I'm convinced its not only coming out of the exhaust ring tubes but...
Forum: Gas Engines
11-12-2023, 07:34 PM
Replies: 303
Views: 54,597
Posted By Timbers

Hi Sharam, When I was breaking in my UMS...

Hi Sharam,

When I was breaking in my UMS 7-90 on the test stand I couldn't get it to run over 4000RPM. The book says I should be getting 5600 out of it. I figured this was because I wasn't...
Forum: Gas Engines
07-21-2023, 04:22 AM
Replies: 303
Views: 54,597
Posted By Timbers

Two Questions

Hi UMS guys, I have two questions. I have a UMS 7-90. First one is do any of you have problems with black spray on your firewall and on the back of your engine? I found it coming out of a couple...
Forum: Gas Engines
05-27-2023, 12:05 PM
Replies: 303
Views: 54,597
Posted By Timbers

Ok

sorry you lost your field where are you located?

Since you have some downtime maybe ask Adrian at CH Ignitions what he would charge to take a look at it and see if he can get it to run up to full...
Forum: Gas Engines
05-16-2023, 04:40 AM
Replies: 303
Views: 54,597
Posted By Timbers

Hey Joe, I have the UMS 7-90 and the entire time...

Hey Joe, I have the UMS 7-90 and the entire time I was breaking it in I could never get it to go above 4200RPM. When I started leaning it out to tune it it still wouldn't come up above 4200. Then...
Forum: Gas Engines
05-15-2023, 06:17 AM
Replies: 303
Views: 54,597
Posted By Timbers

Its a Stinson so its going to fly scale like and...

Its a Stinson so its going to fly scale like and I’d think the 50cc has plenty of power for scale flight. Buy the engine from CH Ignitions and if you notice the issues that you think are carb related...
Forum: Gas Engines
03-05-2023, 05:04 PM
Replies: 303
Views: 54,597
Posted By Timbers

They are worth it but more of a tinkerer’s...

They are worth it but more of a tinkerer’s engine. You will spend more time tuning, tweaking, making baffles, checking valves, breaking in, etc but it will be the coolest engine at your flying field...
Forum: Gas Engines
01-13-2023, 06:57 AM
Replies: 303
Views: 54,597
Posted By Timbers

I've been keeping it at 32:1 in the air too just...

I've been keeping it at 32:1 in the air too just as a piece of mind safety measure. Do you think I should switch to 40:1? I can do that.
Forum: Gas Engines
01-13-2023, 06:12 AM
Replies: 303
Views: 54,597
Posted By Timbers

Yes I have a laser gun that I have been playing...

Yes I have a laser gun that I have been playing with watching the cylinder temps. I had it clean up in the air really well one time and it was very powerful. In the Spring I will start...
Forum: Gas Engines
01-13-2023, 05:55 AM
Replies: 303
Views: 54,597
Posted By Timbers

I wanted to post this awhile ago but I managed to...

I wanted to post this awhile ago but I managed to Maiden my Phoenix Waco 60cc with the UMS 7-90. Everything went well, I broke the engine in according to the directions by running a full gallon of...
Forum: Gas Engines
10-15-2022, 04:38 AM
Replies: 303
Views: 54,597
Posted By Timbers

Ok

From my experience a cylinder that isn’t firing just lowers the top RPM of the engine. Erratic running can be the air you are talking about or maybe your pickup? Your pickup isn’t rubbing on the...
Forum: Gas Engines
10-14-2022, 01:02 PM
Replies: 303
Views: 54,597
Posted By Timbers

is it the 7-90? Did you try replacing the two...

is it the 7-90? Did you try replacing the two spark plugs? Did you try movinf those two plugs to different cylinders to see if the problem follows the plugs to the new cylinders or still exists on...
Forum: Gas Engines
09-06-2022, 05:58 AM
Replies: 303
Views: 54,597
Posted By Timbers

I ran Evolution Oil back when Horizon Hobby sold...

I ran Evolution Oil back when Horizon Hobby sold it about 10 years ago. I ran it in my Saito FG-21. It was blue in color so maybe one could figure out who's oil it actually is because its probably...
Forum: Gas Engines
08-30-2022, 05:55 AM
Replies: 303
Views: 54,597
Posted By Timbers

Thanks for the info. I just noticed there is...

Thanks for the info. I just noticed there is lots of good data in the Moki forums on oils, fuels, etc. Even though there isn't much talk on the UMS engines looking at what the Moki users have done...
Forum: Gas Engines
08-30-2022, 04:36 AM
Replies: 303
Views: 54,597
Posted By Timbers

I finished my Phoenix Waco 60cc with the UMS 7-90...

I finished my Phoenix Waco 60cc with the UMS 7-90 in it last night. Probably maiden it in the next week or two. After the engine warms up for a few minutes I'm able to get the engine to spin...
Forum: Gas Engines
08-09-2022, 06:38 AM
Replies: 303
Views: 54,597
Posted By Timbers

I see you are putting your engine in the Phoenix...

I see you are putting your engine in the Phoenix Waco 60cc, I am putting my UMS 7-90 into the same plane. The firewall in this plane doesn't seem to be as solid as I would like it, do you think you...
Forum: Gas Engines
08-09-2022, 04:13 AM
Replies: 303
Views: 54,597
Posted By Timbers

I was able to get my 7-90 to run to 5200RPM with...

I was able to get my 7-90 to run to 5200RPM with the 24x10 Xoar prop. It even shot up to 5700 a couple times so I richened it back down a bit.

It seems to take quite a bit of warming up though...
Forum: Gas Engines
08-05-2022, 03:49 AM
Replies: 303
Views: 54,597
Posted By Timbers

I haven't pulled them all yet, so I did last...

I haven't pulled them all yet, so I did last night and cleaned them all up till they looked new. I'll give it a try today to see if those other cylinders fire up. I didn't know that about the 5 vs...
Forum: Gas Engines
08-04-2022, 07:58 AM
Replies: 303
Views: 54,597
Posted By Timbers

I have the UMS 7-90 and have almost a gallon of...

I have the UMS 7-90 and have almost a gallon of 32:1 through it now in the 4 minute increments that the book recommends. Almost ready to mount it in the airframe.

I was having quite a bit of...
Showing results 1 to 21 of 21


 
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