GSXR750 lower fork tubes

[Premature Accelerato]

I need to get some new lower fork inners for my 2007 GSXR as the current ones now have too many rust spots turning up and consequently leaking fork seals. In the past I was able to grind out the spots and fill with JB Weld and that worked well but there now just too many small spots. Looking on line I see stainless steel inners and steel/hard chrome varieties are available. Does anyone know what the OEM units are made of or have any experience with replacement inners. I'm comfortable with removing the original inners and reusing the lower castings so dont want to buy new complete units.

[pete376403]

I need to get some new lower fork inners for my 2007 GSXR as the current ones now have too many rust spots turning up and consequently leaking fork seals. In the past I was able to grind out the spots and fill with JB Weld and that worked well but there now just too many small spots. Looking on line I see stainless steel inners and steel/hard chrome varieties are available. Does anyone know what the OEM units are made of or have any experience with replacement inners. I'm comfortable with removing the original inners and reusing the lower castings so dont want to buy new complete units.
Do you know what diameter you need. I have a pair of really good tubes that I bought for a GS1100G and which I didn't use. 37mm diameter IiRC.

[HenryDorsetCase]

I need to get some new lower fork inners for my 2007 GSXR as the current ones now have too many rust spots turning up and consequently leaking fork seals. In the past I was able to grind out the spots and fill with JB Weld and that worked well but there now just too many small spots. Looking on line I see stainless steel inners and steel/hard chrome varieties are available. Does anyone know what the OEM units are made of or have any experience with replacement inners. I'm comfortable with removing the original inners and reusing the lower castings so dont want to buy new complete units.

Presumably this is for a USD fork model?

[onearmedbandit]

Presumably this is for a USD fork model?

Yeah the 750 has been USD since ages ago, only the 600 ran RWU's for a few years.

[Premature Accelerato]

Presumably this is for a USD fork model?

Yep USD.

Am having a look at some Italian made ones at the moment. More expensive than the Chinese made ones but hopefully made of better material. I doubt there is any way of finding out about the exact metallurgy of them but I would think that the price alone would be indicative. Racetec promote these TDK ones.

[jellywrestler]

Racetec promote these TDK ones.

I'd recommend the TNK brand, they have been used by quite a few people including myself and excellent quality. what is the suzuki part number, i will see if my parts cross reference programme can come up with anything

[Premature Accelerato]

I'd recommend the TNK brand, they have been used by quite a few people including myself and excellent quality. what is the suzuki part number, i will see if my parts cross reference programme can come up with anything

Yep, I meant to say TNK, not TDK. From what I can make out the 600 and 750 fork inners are the same. I have emailed Genialmotor who sell them on ebay, to clarify. The chinese makers sell them as a set and say they fit both the 600 and 750 (as do re sellers of USA secondhand parts) but the OEM part numbers are slightly different. Eg the 750 RH part is 51110-02H00 and the 600,s is 51110-01H00. It maybe because the 750's are gold chrome and the 600's are normal silver chrome. I see that other colours are available, have different numbers and are hellish expensive.

[Premature Accelerato]

Yep, I meant to say TNK, not TDK. From what I can make out the 600 and 750 fork inners are the same. I have emailed Genialmotor who sell them on ebay, to clarify. The chinese makers sell them as a set and say they fit both the 600 and 750 (as do re sellers of USA secondhand parts) but the OEM part numbers are slightly different. Eg the 750 RH part is 51110-02H00 and the 600,s is 51110-01H00. It maybe because the 750's are gold chrome and the 600's are normal silver chrome. I see that other colours are available, have different numbers and are hellish expensive.

I heard back from Genialmotor who say the chrome fits the 600 only !!!!!!.

And yet I checked the Race Tech site this morning and they have codes for the 600 and 750 in varying colours. Eg FTNK 0820040 is titanium red for both the 600 and 750. FTNK 0050640 is plain chrome for the 600 only, not available for the 750 ??????.

If titanium is available for both and with the same code (which means the specs are identicle) , then why not plain chrome for the 750?. Bazar.

[jellywrestler]

you still haven't supplied the oem part number

[Premature Accelerato]

you still haven't supplied the oem part number

OEM for the 750 is 5110-02H00 R/H and 51120-02H00 L/H

OEM for the 600 is 5110-01H00 R/H and 51120-01H00 L/H

Cheers jellywrestler

[jellywrestler]

OEM for the 750 is 5110-02H00 R/H and 51120-02H00 L/H

OEM for the 600 is 5110-01H00 R/H and 51120-01H00 L/H

Cheers jellywrestler

the first part number i dont think is correct, not enough digits? either way none go through my parts cross reference programme sorry

[onearmedbandit]

Should be three '1's in the R/H tube number

https://www.ronayers.com/oemparts/a/suz/508c6c2ef8700220a83112b2/front-damper

[HenryDorsetCase]

option B is a set of Ohlins FGRT from KSS..... so what if they cost about what the bike is worth. bling!!!

[Premature Accelerato]

the first part number i dont think is correct, not enough digits? either way none go through my parts cross reference programme sorry

Yeah correct, should have been 51110 - 01H00 etc etc

I have emailed Race tech to get their take on it, will update when I hear back.

[jellywrestler]

Yeah correct, should have been 51110 - 01H00 etc etc

I have emailed Race tech to get their take on it, will update when I hear back.

either way the correct part numbers weren't on my programme so the ones with a digit missing weren't gonna work

[husaberg]

According to the parts fiche they both only are 2006 2007 parts

https://www.cmsnl.com/suzuki-gsxr750-2007-k7-usa-e03_model34350/tube-inner_5111002h00/
https://www.cmsnl.com/suzuki-gsxr600-2006-k6-usa-e03_model16076/tube-inner_5112001h00/

this site list or other vehicles that have the same part number.
that said just because its a different part number doesn't mean it wont fit another model it can be small differences like colour or other foibles.

[husaberg]

https://www.trademe.co.nz/a/motors/motorbikes/parts-for-sale/suspension/listing/5233128589

You're welcome.

[Ascott]

If you are interested, I have a pair of complete forks from a k6-k7 600 that you could have for $400, just a wee drive to Clive they have the gold uppers, the lowers are in mint condition, let me know, 0272303644.
Alvin

[Premature Accelerato]

Up date as promised.

To date I have still not heard from Racetec. It was suggested to me that they probably prefer sales to be directed through a local supplier which would have been fine by me if they had said so. Presume that would be KSS in New Plymouth. Anyway, they didnt so I contacted Alvin, who kindly offered me the purchase of his set of 600 forks.

I drove up to Hawkes Bay and did purchase his forks. Dimensionally they are identical and can bolt straight on. However, as the spring rate was unknown and given that the OEM part numbers are different, I suspect that the spring rate is slightly lower for the 600's and consequently transferred the springs from my old forks to Alvins ones. I did measure them both as a comparison and both length and diameter were the same. I also drained the oil and replaced with fresh oil 5wt fork oil to the same height as my old 750's forks. I also measured the rebound adjuster rods screw in length to the top cap as I was aware that Alvin had had Ktec internal installed. Put it all back together and reset sag etc.

To check it out, this last weekend Vic motorcycle club held a 2 day event at Manfeild. Paid me monies and had a play. Yep they work bloody well. I only had to make 1 more click on the rebound and i was/am happy as a pig in muck. I should have said at the beginning that the bike is a track only bike and hence my hedging at buying some of the cheaper fork tube available.

Many thanks to Alvin, a really good bugger and I enjoyed my time talking with him. Great to meet another old prick who loves bikes and totally worth the trip up to Hawkes Bay