| Listed in parts books | Not catalogued by year yet |
VALVE SPRING SET 650/750
Valve spring set for Triumph 650 and 750 twins (T120, T140, TR6, TR7 family), also cataloged as 70-4221, 70-7400, and 70-4222.
This is the valve spring set listed for the 650 and 750 Triumph twins, covering the T120, T140, TR6, and TR7 family. The set replaces the springs (and, depending on how it's packaged, the collars) that sit in the cylinder head and keep the valves seated between openings, so it's a top-end job part rather than something you'd tackle mid-ride.
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Over time these springs lose tension and can let valve float creep in at higher revs, so this is a common item to swap out during a head rebuild or when you're chasing lost performance up top. It's cataloged across both engine sizes without a break by year, so whether your book lists it as 99-7037 or under the related numbers 70-4221, 70-7400, and 70-4222, you're looking at the same physical set.
We don't have extensive shop notes on file for this one beyond what's in the catalog, so if you've got questions about exact spring rate or how your particular head is set up, give us a call before you order and we'll help sort out fitment.
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