What to tune next???

kingtigg

kingtigg

New member
Joined
Nov 21, 2005
Messages
78
Location
Winnipeg, Manitoba
98 SRX 700.

The highest speed ive been able to attain is 158km/hr (98mph) on GPS.

I see the common setup for clutches is a WWW, 8DN20s, 4.5g each hole, 51/43 and red @ 70.

I'm running YSY, 8DN20s, 2.4g inner, 2.7g outer, 52/43 bender and red @70.
Belt is about 70% used, motor has about 7000 kms on it (im doing the top end this coming summer), everything else is stock AFAIK.

Off launch it will overshift if I don't feather the throttle, if done well it will jump to about 8000 and climb to about 8500 eventually.
If I am trail running and running hard corner-to-corner it will only jump to about 7800 rpms when I hammer on it after the corner!
I tried wrapping the helix to 90 to see the effect and I could only top out at about 140...but the sled sure did feel snappier....the odd thing is I didnt notice the rpms change much at all in trail riding (still ~7800)!
-Compression is up around ~120 on all 3 (within 10% of each other at least...i cant remember exact numbers tho)
-Powervalves are all clean and adjusted.
-New plugs and boots installed at start of season.

Here are things I'd like to correct if possible. Can any/all of these be solved? If so, how?
1) Why am I only able to run about 1/2 the weight of the common setup? Is it possible that my engine power is low? How much effect would the old piston rings have? Is this because it is a 98 and not a 2000+?

2) What can I do to break 100mph like it should?

3) I would sure love to have 8300 rpms after hammering on the throttle after a corner...what can I do for this?

4) How many additional rpms can I expect to see the sled pull when I replace the rings, and when I get a new belt?

5) Could I possibly re-distribute the primary weight to solve some of the above problems?

Thanks in advance!...
I really need some direction from everyone as to where I should focus on next to get the last 10-20 mph out of this machine!

-KT
 
on the 98-99 you only want to run 8300 wide open throttle 500 on 2000+years.Add a little tip weight to yours to bring it down to 8300 and you will gain some mph.
 
Would going up to 3.1g rivets in the outer be enough?
Would this not add to my problem of only winding up to ~7800 after a corner?

thanks!
 
I think you have powervalve issues. you should be pulling 4.5 grams in each hole...easily. Check the backers to see if you have any pulled through. You gotta remove the pv,s & check the backers to do this properly..
 
Thanks Turk, thats good to know I should be able to pull that much weight when everything is running properly.

I'll tear apart those PVs this weekend and look for broken cables, servo operation, dirt, and adjustments and report back.
 
I had the same thing happen to me on my 2000... it only pulled 8000 rpms and the primary weight was much lower than it should have been... i cut just about every corner when checking the valves but when i pulled the housing off sure enough all three valves were pulled through... they are an expensive fix and i now know how important it is to check these things at over $300 new at the dealer.
 
hmm...i checked, adjusted, and cleaned them all about 900 kms ago (start of season)...i am running semi synthetic so it shouldn't be too dirty...I kind of hope I find something though since It would be nice to find the problem!

I'll check this weekend and report back for sure...any other obivious things I should check?
 
Ok...so I figured I should update the group now that I've figured it out!

I'm a bone-head...once again.

It turns out that exhaust donuts between the manifold and pipes on 2 of the cylinders were gone....wow...what a HUGE difference in power now that they're replaced!

I'm now running 2.4g inner and 4.5g outer rivets. Im overreving on the top to about 8600...im going to try my other helix (54/44) and see if that helps...otherwise I guess Ill need to go with more than 4.5g outer since the low-end shift is already only jumping to ~8200 off the line.

...either way..ive hit 107mph on the gps...and i now run neck-and-neck with my buddies 2005 800HO REV right off the line!

...im very happy now.

Does anyone else have any better sugestions for this last little tweaking I need to do?...should I try 4.5g on the inner as well?

Thanks!
 
I have a www out of a srx short cover Shipping to you would be the bad part. $10 for the spring. Maxdlx
 
What changes would this make compared to my YSY that is currently in there?...TURK?

I thought these 2 springs were pretty darn close other than engagement rpm...
 
I would install 4.5 in both holes, same primary spring, and put in a 50/45 helix, you should be super close to 8300rpm then.
 
hmm...too bad it wont work with the 52/43...i dont really want to buy another helix....:(

If i see one around i may try that...thanks for the help!
 
your helix can be made to work if you simply get a couple washers and put them on the tip with a 4.5 rivet, this will give you more tip weight and clamp the belt more and drop topend rpm.
 
hmm..thats a great idea...i guess I just need to make sure the weights wont hit the clutch when the fly out.

I should have thought of that earlier...:)..thanks!
 
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