Author Topic: Need help identifying engine component  (Read 830 times)

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Offline kosmo

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Need help identifying engine component
« on: October 18, 2018, 12:17:20 AM »
Hi all! Have an oil leak on my IT400E, my first thought always jumps to worst case scenario aka cracked cases. Luckily that's not the case, just a bad gasket on flange bolt on the underside of the engine (not the drain bolt). Can someone explain to me the purpose of the flange bolt? It has a spring loaded "finger" on it, and it doesn't fully thread in without the gasket (not to worry, I didn't force it). The exploded parts diagram shows it as #8 even though that's not what it actually looks like.


Offline T.RexRacing

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Re: Need help identifying engine component
« Reply #1 on: October 18, 2018, 01:29:58 AM »
I believe that's the shift cam detent spring bolt.
Whatever you do will be insignificant, but it is very important that you do it.
- Mahatma Gandhi

Offline Hillwilly175

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Re: Need help identifying engine component
« Reply #2 on: October 18, 2018, 04:48:02 AM »
My PE 175 had one and I sanded the "finger" tip with the finest paper I had because it was somewhat rough. It made a huge change on the smoothness of shifting. 


Offline kosmo

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Re: Need help identifying engine component
« Reply #4 on: October 19, 2018, 03:52:23 AM »
I believe that's the shift cam detent spring bolt.

That does indeed seem to be the case! Thank you!

My PE 175 had one and I sanded the "finger" tip with the finest paper I had because it was somewhat rough. It made a huge change on the smoothness of shifting. 

Good to know!! Mine is fairly smooth I'd say :)

Is this it?

It is! Weirdly enough the part number I have down for #12 is different than what is shown on the photo you attached...I was going to order it today but looks like I need to do more research and figure out why the part numbers are different

Offline kosmo

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Re: Need help identifying engine component
« Reply #5 on: October 19, 2018, 04:00:30 AM »
Well, I am confused.

The photo that I posted, the gasket is shown as #9 and has the associated part number 90430-10171-00 at a cost of $3 USD

However, if I look up the same gasket on the exploded diagram of the shifter mechanism (same pic as Martin posted but from the set of exploded views that I am using) it shows up as the same part number for the drain bolt gasket, 4F4-14766-00-00, $8 USD

BUT IT GETS EVEN BETTER, the pic that Martin posted has that same gasket with a totally different part number than either of the two I just mentioned.

What gives? What part number do I order?

Offline kosmo

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Re: Need help identifying engine component
« Reply #6 on: October 19, 2018, 04:10:59 AM »
Did some eBay research...

It appears that 90430-10171-00 is the part number for that gasket but in brass

137-15353-00-00 is the composite one, exactly like the one I took off my bike to replace

Still not sure why in the one parts diagram it is interchanged with the drain bolt gasket. I would assume that this shift cam drum stopper thingy needs to be spaced accordingly from the case in order to function correctly, which is why I was worried about over torquing it.

What do you guys think, replace exactly what I took off or follow the parts diagram for the cases instead of transmission and get the brass one?

Links:

drain gasket: http://www.ebay.ca/itm/Yamaha-4F4-14766-00-00-GASKET-DRAIN/302397171437?epid=1928141511&hash=item466846a6ed:g:2ZIAAOSwhMBZ5Mt6:rk:1:pf:0


finger bolt composite gasket : http://www.ebay.ca/itm/New-OEM-Yamaha-Drain-Gasket-NOS/253895604978?hash=item3b1d5b7af2:g:AwwAAOSwWotbqkmB:rk:3:pf:0

same thing^ but brass: http://www.ebay.ca/itm/NOS-YAMAHA-TX750-TW200-FZR1000-XV1100-VMX1200-GASKET-90430-10171-00/200417926453?epid=1711866234&hash=item2ea9d6dd35:g:7ewAAOxyY9VROFLc:rk:1:pf:0

Offline T.RexRacing

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Re: Need help identifying engine component
« Reply #7 on: October 19, 2018, 04:17:45 AM »
I'd go with the brass. Composites fail from chemical decomposition.
Whatever you do will be insignificant, but it is very important that you do it.
- Mahatma Gandhi

Offline kosmo

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Re: Need help identifying engine component
« Reply #8 on: October 19, 2018, 04:20:57 AM »
I'd go with the brass. Composites fail from chemical decomposition.

I believe that's why the stock one failed...I was swinging more towards brass as well but wasn't sure if it would seal as well as well as the composite one. Thanks for the quick reply! Heading over to the dealership after work to order the next batch of parts aha.

Just picked up a clapped DT100 to restomod for my girlfriend, I feel way in over my head with 3 projects haha.