Where the clutch cable adjustment happens on your Trident 660
The clutch cable on a Triumph Trident 660 has two adjustment points: the barrel adjuster at the handlebar lever and the locknut-and-adjuster assembly where the cable meets the clutch arm on the engine. Most riders adjust the handlebar barrel first because it requires no tools and no engine work. If that alone does not give you the engagement point you want, you then move to the cable adjuster at the clutch arm itself.
The engagement point is where the clutch begins to disengage as you pull the lever — the moment the friction plate starts to separate from the flywheel. A cable that is too tight makes the clutch drag (the bike creeps forward in gear with the lever pulled all the way in). A cable that is too loose means you have to pull the lever most of the way to the bar before the clutch actually disengages, which wears your hand out and makes smooth shifts harder.
Key Takeaways
- The handlebar barrel adjuster is the first place to turn; it moves the engagement point without touching the engine or removing the seat.
- Turning the barrel adjuster out (counterclockwise) tightens the cable and moves engagement earlier; turning it in (clockwise) loosens the cable and moves engagement later.
- If the barrel adjuster runs out of thread before you reach the engagement point you want, you must adjust the locknut and adjuster at the clutch arm on the engine.
- The Trident 660 clutch cable should have roughly 2 to 3 millimeters of free play at the lever before the cable begins to pull the clutch arm.
- After any adjustment, pull the lever through its full range several times and check that the bike does not creep forward in gear with the lever fully pulled in.
Adjusting the barrel adjuster at the handlebar
Locate the barrel adjuster on the clutch cable where it enters the lever perch on the left handlebar. It looks like a small cylindrical nut with a cable running through it. You do not need any tools for this step — your fingers are enough, though a small adjustable wrench makes it easier if the adjuster is tight.
Pull the rubber dust cover back to expose the threads. Turn the barrel adjuster counterclockwise (away from the lever) to tighten the cable and move the engagement point earlier — meaning the clutch begins to disengage sooner as you pull the lever. Turn it clockwise (toward the lever) to loosen the cable and move the engagement point later. Make quarter-turn adjustments and test the lever after each one. The goal is to find the point where you have light free play at the lever (the lever moves a small amount before the cable starts to pull) and the clutch fully disengages before you reach the end of the lever's travel.
If you turn the barrel adjuster all the way out and the cable is still too loose, or all the way in and the cable is still too tight, you have reached the limit of the handlebar adjuster. Stop there and move to the cable adjuster at the clutch arm.
Adjusting the cable at the clutch arm when the barrel runs out
The cable adjuster at the clutch arm is located on the left side of the engine, where the cable connects to the clutch arm lever. You will need a 10 mm wrench and a 8 mm wrench (or an adjustable wrench that fits both). The adjuster consists of a locknut (the larger nut closer to the engine) and an adjuster nut (the smaller nut farther from the engine), with the cable running through both.
Loosen the locknut by turning it counterclockwise with the 10 mm wrench. Once it is loose enough to move by hand, hold the locknut still and turn the adjuster nut counterclockwise to tighten the cable (move engagement earlier) or clockwise to loosen it (move engagement later). Make small adjustments — a quarter turn at a time — and test the lever after each change. Once you have the engagement point where you want it, hold the adjuster nut still and tighten the locknut clockwise until it is snug against the adjuster nut. Do not over-tighten; snug is enough.
After tightening the locknut, test the lever again to make sure the adjustment did not shift. If it did, repeat the process. Once you are satisfied, reset the barrel adjuster at the handlebar to the middle of its range so you have room to fine-tune in either direction later without running out of thread.
Checking free play and full disengagement
Free play is the small amount of lever movement before the cable begins to pull the clutch arm. On the Trident 660, aim for roughly 2 to 3 millimeters of free play at the lever. To measure it, hold the lever and gently move it forward and back; you should feel a small amount of give before resistance begins. If there is no free play, the cable is too tight and the clutch will drag. If there is more than 5 millimeters, the cable is too loose and you will have to pull the lever too far to disengage the clutch fully.
After you have set free play, pull the lever all the way to the bar and check that the clutch fully disengages. Put the bike in gear, pull the clutch lever all the way in, and roll the bike forward by hand. It should roll freely without the engine turning. If the bike creeps forward or the engine turns, the cable is too tight and the clutch is dragging. Loosen the cable slightly and test again.
Common mistakes and how to avoid them
The most common mistake is adjusting only the barrel adjuster and not realizing it has reached its limit. If you turn it all the way in or all the way out and the engagement point is still not where you want it, stop and move to the clutch arm adjuster. Continuing to force the barrel adjuster will not help and may damage the threads.
Another mistake is over-tightening the locknut at the clutch arm. This can strip the threads or bend the cable adjuster bracket. Tighten the locknut until it is snug — firm enough that it will not loosen on its own — but not so hard that you need a wrench to turn it by hand afterward. If you find yourself using heavy force, you have gone too far.
A third mistake is forgetting to reset the barrel adjuster after working on the clutch arm adjuster. If you leave the barrel adjuster at either extreme, you will have no room to fine-tune the engagement point later without going back to the engine. After you finish at the clutch arm, turn the barrel adjuster to roughly the middle of its range.
When to replace the clutch cable instead of adjusting it
If the cable is frayed, kinked, or visibly damaged, adjustment will not fix it — the cable needs to be replaced. If the cable has been adjusted to its limits in both directions and you still cannot find a good engagement point, the cable may be stretched or damaged internally and should be replaced.
A cable that feels gritty or stiff when you pull the lever, even after lubrication, may have internal corrosion or damage. If you have adjusted the cable multiple times over several months and it keeps drifting out of adjustment, the cable may be slipping inside the housing or the adjuster threads may be worn. In any of these cases, a new cable is the better choice than continued adjustment.
Frequently Asked Questions
How often should I adjust the clutch cable on my Trident 660?
Most riders check the clutch cable free play every few months or whenever they notice the engagement point has shifted. New cables often settle after the first few hundred miles and may need one adjustment. After that, a well-maintained cable should hold its adjustment for a year or more unless the bike sits unused for long periods or the cable gets wet and corroded.
Can I adjust the clutch cable while the engine is running?
No. Always turn off the engine and let it cool before adjusting the cable. Working on a hot engine risks burns, and adjusting while the engine is running can cause the bike to move unexpectedly if the clutch engagement changes during the adjustment.
What happens if I make the clutch engagement point too early?
If the engagement point is too early (the cable is too tight), the clutch will drag — the bike will creep forward in gear even with the lever pulled all the way in. This wears the friction plate and makes smooth downshifts harder. You will also feel resistance in the lever even when it is fully pulled in.
Do I need to bleed the clutch after adjusting the cable?
No. The Trident 660 uses a mechanical cable clutch, not a hydraulic one, so there is nothing to bleed. Cable adjustments require no fluid work. If your Trident has a hydraulic clutch (some model years do), you would not adjust a cable — you would adjust the hydraulic master cylinder or slave cylinder instead.
What size wrench do I need for the clutch arm adjuster?
You need a 10 mm wrench for the locknut and an 8 mm wrench for the adjuster nut. An adjustable wrench works if you do not have metric wrenches on hand, but having the correct sizes makes the job faster and reduces the risk of rounding the nut corners.