I recently purchased a very nice Italian made super tigre G-75. I have read that everybody replaces the carbs with O.S. or something similar as the stock carb is not that great. I was wondering what carb i should use. I have a O.S. 4D carb off an old .46sf and a 55ax carb. I was wondering if these would be a good replacement or would just not work at all. I haven't recieved the engine yet so I have not been able to do any testing.

Thanks,
Joe

Joe, don't believe or take to heart everything that you read in the modeling forums or press. Many writers have zero experience (unless you count a year or year and a half). While these folks may be good at writing, it doesn't necessarily follow that they know anything about model airplanes or their engines.

Any glow two-stroke will be a little cranky and obstinate during its break-in period. Yes, replacing the stock carburetor with an OS carb may make flying an unbroken-in engine a tad easier, but chances are the price of the carb is going to be way up there. If you just bench run the engine through break-in (follow the manufacturer's instructions), you will find that the stock ST carb will handle the throttling chores admirably well.


Ed Cregger

Do a search here on RCU for Super Tigre and you will find many inputs for adjusting the ST carbs. Learn how to adjust them and you will be happy with the results.

Sincerely,

Richard

I had owned and flown a few Super Tigre 75 engines. These are ringed engines. It's necessary to break it in first before you mount and fly it. That's just the nature of ringed engines, not the carb. Run 5-6 tanks through it and see if you achieve a good idle and transition. Don't use the factory glow plug on it. Use lower nitro content and a castor based fuel.

My favorite Super Tigres that run great are the ABC variety, the 45 and the 61. I have on that has been flown 4 seasons and runs better than it did when it was new. The 10X8 prop worked best on the 45, and a 13X6 worked best on the 61. They like more prop than an OS does.

How about this: http://www.rcuniverse.com/forum/m_1579985/tm.htm

We've been adjusting SuperTigre engines since the early 1970's, when we first started working with them...well before we became the SuperTigre service center.

There's nothing at all wrong with the Super Tigre carb...I would not replace it if I were you.

I have a lot of supertigre engines and I have run them all with the stock carbs, they can always be tuned for a perfect idle and full throttle but some will be a little rich in the midranges. I have never felt the need to change out the carb despite the slightly rich midrange, it's never a problem.

This is just my opinion, some will always curse these carbs anyway.

I wish I could replace OS airbleed carbs long before any Super Tigre carb.

The only probs. I have found is that 4 out of the 5 tigres I have is that there might be a loose screw or some sort of air leak. If you are aware that this might cause a prob its all good. They are a good reliable engine. Cheers the pope

I was just about to say the same thing about OS head bolts. You own more than 5 tigres?

Howdy Mr53 I was refering to the carb (sorry I didnt make that clear ) I havent found any other bolts on the engines loose. I have 2x 45s 2x51s and one 90. All my OS`s have fine engines. Cheers the pope

I have always felt that Super Tigre's are more critical of fuel tank position than other brands. This made a huge difference in my first, a ST .23 I set up my tanks center line ( c/l) the same as the needle valve c/l. Some applications even require side mounting the engine.

When you have a Super Tigre setup properly you have an above average powerplant that doesn't need a different carb. ST low and high needle setting do affect each other. I think of it as balancing them. When striving for the perfect setup, a change in the low speed needle setting can give more rpm's on the top. I have always liked that benefit with ST carbs. They also work great with low nitro fuels, have great idling, transition and top end characteristics. I have over 30 Super Tigre engines and only the ones with the 'dog leg' groove in the carb barrell ( on the 2300's ) had issues. ST offers a new part to fix this issue on that carb.

I always did very well with my Super Tigre ABC engines the most. I always preferred the pen bladder tanks personally on C/L.

My first Tigre was a Goodyear Tigre .15 C/L back in 1974. I finally found an affordable deal on a Ringmaster kit I'll build and fly this fall after waiting 35 years to use it again. I know I'm forgetting something negative about my experience with C/L or I wouldn't be spending a fortune on RC ever since. After flying this sequel, I'm sure I'll rediscover what that was if I'm not to dizzy to think straight.