Slingshot valves in 750L

[Motovalet]

I need a couple of inlet and exhaust valves for my 1990 750L, does anybody know if I can use the ones for the short stroke J/K Slingshot models or are the bigger/smaller etc. ??

[Oilyspanner]

The short stroke 750 valves are the same size as the 1100 and wouldn't fit the long stroke 750 head - you can't use the 750M valves either, the shim head valves are a different length.

[Oilyspanner]

This might be useful :

I think the late model GSX750F, which used the long stroke motor, was based on the L motor - so would probably use the same valves - a bit of research should confirm this.

Oily

 

 

[Oilyspanner]

Have time on my hands, so just checked the inlet valve part numbers, they're different, it was worth a look though for my own info.

[Motovalet]

Yeah, 750F is a short stroke motor sadly. I've a 600F motor which is a long stroke motor but I'm thinking the valves would be smaller in there anyway? I've found plenty of used valves for the slingshot J and K motor but can't find anything for the L motor? looking like I'll have to stump up the mega expensive price for a new genuine Suzzook one :-(

[Madb]

750L valves are specific to that head only. As per microfishe. Don't list fitting to any other models. 

12912-17D00 ex valve part no.

12911-17D00 in valve part no. 

Hope that helps. 

[Del]

On 30/05/2016 at 6:53 PM, Motovalet said:

Yeah, 750F is a short stroke motor sadly. 

Not the 98 onwards,that went to a 750 long stroke.

And according to Bike parts-suz.com,the 750j/k and l all use the same.
http://www.bike-parts-suz.com/microfiches-s_recherche_piece.html?recherche2=oui&text_recherche=12911-17D00-000

http://www.bike-parts-suz.com/microfiches-s_recherche_piece.html?recherche2=oui&text_recherche=12912-17D00+&image=Search

 

[Del]

And they are only £20.99 at Robinsons plus your oss discount
http://www.robinsonsfoundry.co.uk/pages/home/advanced-search.htm?search=12912-17D00&is_posted=yes&submit.x=4&submit.y=6#tabs|Search:parts

And £15.20
http://www.robinsonsfoundry.co.uk/pages/home/advanced-search.htm?search=12911-17D00&is_posted=yes&submit.x=22&submit.y=8#tabs|Search:parts

 

Edited July 3, 2016 by Del

[Motovalet]

I got hold of a couple new inlet valves off of eblag  in the end and got a local engineering firm to turn them down to fit as exhaust valves :-)

[canamant]

You did WHAT !!!! 

 

[Motovalet]

21 hours ago, canamant said:

You did WHAT !!!! 

 

Yup, that's right, turned it down, machined it, pressure tested it in the head and fits and seals perfectly! Looks just like all the others too! :-)

[canamant]

Um - going back a bit here but exhaust valves used to be treated to withstand the intense heat of the exhaust gases. That is why they are usually more expensive.  Inlet valves were not because they run much cooler.  Also the valves used to be surface hardened so machining them would require a big first cut to get through the surface.  That's why I said   "WHAT !!!".  If it works and lasts, all well and good.

 

[Gixer1460]

That's what you may believe but valve durability is usually down to steel alloy used or construction - more silicon or chromium will improve heat resistance or two part valve with stainless 21-2N or 21-4N head on a non stainless stem usually fares better. No treatments, no hardening, just alloy selection, casting, machining, quenching, tempering and grinding goes to make a valve. 

[Motovalet]

Well all I know is the motor is running like a charm with the turned down valve in , plenty of compression and no issues so far ;-)