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Thats the one. Manual doesn't mention loctite. I was tempted to use red but smothered it in blue and will check it after a few rides. Now I know the sympton I will be parked the second it ever happened again. Part number 5: BOLT, WASHER BASED 90105-10445-00 $4.55 https://www.bikebandit.com/oem-parts/2017-yamaha-yz250-yz250h2/o/m15918…

Bought a tap to clean the thread on the crank and with loads of loctite a new bolt is fitted. Managed to clean up the old bolt for an emergency fix if ever needed. Ran up with the cover off and all seems to work fine including the water pump. Test ride tomorow. If it happens to you stop riding...

I'm not unfortunately, that would make life much easier with so many stores to choose from We vacation the area to ride. Proride Phil has a bunch of our stuff living in his garage in Fontana. Not been out a while, this will be the third year missing it, but will be back for 2021 en masse. At least that...

Picking up the bolt Sat morning. Had stuff on today but will give the case and the female thread the once over Fri. Not perfect for a new bike but could have been way worse.

Exactly what it is and what happened. The case is saveable as not bad enough to even leak yet. I will clean the female thread hopefully as apparently it's M8 1.25 and I have that tap somewhere. Finding the bolt in stock was a nightmare despite it fitting several street bikes as well. Having found one they are closed for...

Made a mess of this bolt but I think the thread it goes into is reclaimable with a tap to clean it up.

I'm still not 100% lol

This doesn't bode well

Well i warmed her up for as short a time as i dared so I could rev it with upsetting the neighbours too much. No movement of the arm so I got braver and revved some more. How many revs before it opens? Unless you have to scream it somethings gone. I may have to wait for the other bike...

I survived new year so later today I will try running the bike without the P/V cover to see what happens and if there is movement. As I said if the arm is moved manually I can see the P/V moving. Having had the carb apart twice I will wait for the donor bike and try the whole carb as...

Thx for the advice guys. I did try the plug, 2 in fact. I did also blow through the tank vent and the tap is full flow. The bike is pretty much like new so pipe and exhuast are clean as was the carb. Trying with the P/V cover off seems an easy test to start with. I presume me...