RCU Forums - YS 91 FZ problems

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- - YS 91 FZ problems (https://www.rcuniverse.com/forum/ys-engines-support-197/1135362-ys-91-fz-problems.html)

elmer

09-14-2003 12:16 AM

YS 91 FZ problems

HI

I have a YS 91 FZ that I am having some problems with. The motor has a about 4 gallons of fuel through it, but will just not run at low throttle without quitting.

As the instructions I have set the high speed needle, and after much fiddling cannot get the low end to run reliably.

I have noticed that after reducing the throttle from full to idle, the engine ticks over for a few seconds then picks up rpm and quits.

Can anyone tell me if it is normal for there to be a lot of air bubbles in the tube that goes from the regulator to the carb ( at low throttle ).

I have read other threads about this type of engine, and although I am very familiar wth standard four storke engines this thing has me puzzeled,

Hope someone can help

Simon

Dirkg

09-14-2003 12:14 PM

RE: YS 91 FZ problems

Quote:

ORIGINAL: superflisi

HI

I have a YS 91 FZ that I am having some problems with. The motor has a about 4 gallons of fuel through it, but will just not run at low throttle without quitting.

As the instructions I have set the high speed needle, and after much fiddling cannot get the low end to run reliably.

I have noticed that after reducing the throttle from full to idle, the engine ticks over for a few seconds then picks up rpm and quits.

Can anyone tell me if it is normal for there to be a lot of air bubbles in the tube that goes from the regulator to the carb ( at low throttle ).

I have read other threads about this type of engine, and although I am very familiar wth standard four storke engines this thing has me puzzeled,

Hope someone can help

Simon

Sounds like the low end is lean

Try setting up the mixture as describe on this page
http://www.probuild-uk.co.uk/factsheets/ys_engines.php

Hope this helps
Dirk

mfuess

10-02-2003 08:41 AM

RE: YS 91 FZ problems

Greetings,

You are one of many people that experience difficulties with your first YS four stroke engine. The fact is, your YS four stroke engine is very high-technology engineering. It's imparative that you have a thorough understanding of how they function so you can take advantage of the YS technology, and how to maintain it.

Please take the time to visit my YS webpage and read it carefully! You will access all the expertise you need to make your engine run PERFECTLY. You will also learn what makes YS engines so superior to "conventional" four strokes.

http://mfuess.home.texas.net/ys110.htm

Mark Fuess

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