Thread: Valve Guide Replacement
08-03-2013, 06:18 PM #1
08-03-2013, 08:34 PM #2
To keep it from mushrooming out and ruining the cylinder head
08-03-2013, 09:14 PM #3
08-03-2013, 09:19 PM #4
I noticed the top of the guide where the seal sits is quite a bit smaller; but then it gets larger just before going into the head with a ring groove that I imagine a lip on the head seats into. Seems like it could be pushed out without mushrooming to the point the external diameter would become too large; especially since its smaller at the top. Has anyone ever replaced these without machining the top off?
Last edited by Adrenaline Junkie; 08-04-2013 at 02:51 PM.
08-04-2013, 09:46 AM #5
I pushed some out without machining and they came right out
Then let the machine shop install.... slow91, do u use factory or SBT guides? The SBT guides had to be termed quite a bit...
08-05-2013, 11:33 AM #6
the reason you machine the guide down is because 99% of machine shops use a guide driver which fits inside the guide and you use a hammer to knock the guide out. Doing it that way will mushroom the top of the guide, so when the guide gets down to the head casting it is now larger than the guide bore and it WILL gull up the bore and your new guides will not have a press fit. I do not use anything from SBT. I usually make my own guides.
08-07-2013, 05:00 AM #7
Does anyone know the valve heights for these rotax engines?
08-07-2013, 12:13 PM #8
- Join Date
- Jul 2005
- Lake Dunlap, Texas
08-09-2013, 11:18 PM #9
why is there no mention of height in the manual for valve replacement?? Should we not have some figures/tolerances??
08-10-2013, 10:37 AM #10
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