Originally Posted by
motomatt
Are you plugging the exhaust to stop the engine? This can be the cause of the blown plugs. Perhaps your conditions are different from my area, but when I'm well tuned my engine temps in the 250F range. 190 would be pretty rich for me. I presume you have read the tuning instructions at the Massive Mods website.
If you firmly grasp the flywheel, can you move the crank in or out? There is no oring or seal between the front bearing inner race and the crank. When the flywheel is installed it should pull the crank forward against the front bearing inner race. The shoulder on the crank should then provide an almost perfect seal and limit crank movement since it's now against the inner race and the Collet is on the other side.
The flywheel was removed along with the collet when I leak tested it , hopefully then this leak will stop when assembled,
Have tried tuning MM method but always had problems, since changing seals and bearings though the method works again as it did when the engine was new, thought it could be rich with the low temp but the high revving when off wot says different,
Did not realise plugging the exhaust stinger could take out the plug, will stop it using the flywheel in future and see if it helps,
Looking for 97t plugs or other type in the UK as int postage makes them way too expensive.
Just a thought that has hit me, can not find any other leak on the engine but used a flywheel off another engine and wondering if it actually locking and sealing the crank against the bearing, will investigate this further as it could explain alot it it isn't.
Thanks for the advice