SRX 600 front suspension

[themoudie]

Aye Rafe,

The data within inverted commas below, is copied directly from SteveH's SRX600 website tech specs. You will note that the lesser 'Spring Free Length' is the minimum dimension of Yamaha's 'acceptable' range. Hence my comment in my previous post about a new set of springs.

"Chassis Component
Front Suspension  Range  Limit 
Bearing type  Ball Bearing           
Total Travel  140mm  5.5in       
Spring Free Length  480.5mm  18.9in  475.5mm  18.7in 
Collar Length  70 mm  2.8in       
Spring Rate Stage 1  7.85N/mm  44.8lb/in       
Spring Stroke Stage 1  0-83 mm  0-3.27in       
Spring Rate Stage 2  10.8 N/mm  61.6lb/in       
Spring Stroke Stage 2  83-140 mm  3.27-5.51in       
Oil Capacity  321 cm'  10.9 US oz       
Oil Level  137 mm  5.4in       
Oil Grade  Fork oil 1OWt           
Note: Oil level measured from top of inner tube fully compressed without spring"

You'll also have read that SteveL prefers 15w fork oil, from the 'standard' 10w, which is the viscosity that I use. I have also checked the length of the 'Progressive' springs that I have fitted and these are part number 11-1128, which have the following spec:

Order No. Free Length - In. Free Length - MM O.D. - In. O.D. - MM. Rates lbs/in Rates kg/mm Spacer mm
11-1128     19.75              502                      1.14          29           30/45         .54/.80       10.00

As you can see this is not 'standard' but the spring recommended by Progressive.

Hagon quote their following part number: 400-192-01- 400-192-01 YAMAHA SRX 600 (1 XM/XL) 85-89 (5) 140mm Air Gap.  Hagons advise that these are also suitable for the SRX400, for the same period of 1985-89, but provide no technical details!! .

Contact for Progressive: Progressive

Contact for Hagon: Hagon

I hope this helps.

My regards, Bill.

[guest1334]

Ian, Bill, Steve - many thanks for the help, PMs sent.

Was considering new springs, think thats a definate now. Not sure I could manage a newer front end, I've spent enough time phaffing to get this far. Reckon I've spent more time looking up stuff on PC than I have riding the bike so far.

I'm on a slippery slope - found myself thinking it would be good to have a second bike while first is off the road.....

[themoudie]

I'm on a slippery slope - found myself thinking it would be good to have a second bike while first is off the road.....

Aye Rafe,

That is why I have 'Sally'!!! Duke needed a rebuild, I couldn't find the time, so bought another bike. Ten years on, the Duke still isn't rebuilt, the abuse from local acqaintances and my wife is getting worse and 'Sally' is still being ridden, maintained and ruling the roost! The Duke is still in bits!    One or two regularly ridden machines I think is possible, but these 'collections' do you head in in the end! 

All the best with getting yours back on the road.

My regards, Bill.

[Ian]

I "only" have two at the mo....I ride whichever one my mood takes me...Somedays Im just content dawdling along on the SRX, others I need to hurry along on the Bonnie....the old adage of horses for courses I think

Apologies to Rafe for "almost" hijacking his thread.

Hope you get sorted with your forks now...its a certain fact that we may be coming to you in future for information ourselves and how you got on with your task.

Best Regards

Ian

[guest1665]

I appear to have the same problem as Dawdler. The springs were out last night - they measured just under 480mm. Obviously they'll have to be replaced as part of a complete fork overhaul. So a tool like the one described will have to be fashioned.

I was hoping to just refill with oil, but no. I think once I get round to the oil I'll use 15w to avoid the pogo-stick affect that I've got at the moment. It dives like an Italian striker under heavy braking.

[themoudie]

Aye Keithypete,

"I was hoping to just refill with oil, but no. I think once I get round to the oil I'll use 15w to avoid the pogo-stick affect that I've got at the moment. It dives like an Italian striker under heavy braking. "

I wouldnae go there, with 15w oil. I'm 190lbs (86kg) and prefer the 10w with the Progressive springs, but as you can see SteveL prefers the stiffer front end and he is definitely more circuit adept than me. Start with a new set of springs and standard oil, with good seals and then you can tinker with the oil at your leisure.

If you need info on the 'tool' mentioned elsewhere in this thread, I can send you details.

My regards, Bill.

[guest1665]

I'll take any & all advice I can, thanks.

Regarding the 'tool', please send any details and tips, and so on, so I can get one built.

Cheers, Pete.

[themoudie]

Aye Pete,

Tool details on the 1st page of this thread (including measurements, it doesn't have to be exact apart from the bolt head) along with a photo of the finished job.

A *.pdf of a factory manual awaits, if you would care to send an email address to the 'private' mail link to the side of this message. Less likelihood of you getting 'spammed'!

My regards, Bill.

[guest1665]

PM sent. Cheers.

[themoudie]

You should have message and download! 

Regards, Bill.

[guest1665]

Thanks. That's very helpful. Nice one.

[themoudie]

Nae bother.

Now off for a run afore being summoned for Father's Day festivities this pm. Wall to wall blue and a balmy 20C 

My regards, Bill.