Compression test on 2017 675R - Triumph675.Net Forums
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post #1 of 3 Old 06-04-19, 01:29 Thread Starter
Moe Fareed
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Exclamation Compression test on 2017 675R

hi all,

I had recently just blew up one of my coolant line on my 2017 675R on a track day. I pulled back into the pit area and let the bike cool down. Little did I know at the time I was at the track, i thought it was just the weep hole relieving itself thinking it just got a bit hot and I was running it hard. So. With that in mind my dumbass decided to ride it back home for about 5 miles till I noticed it overheated and flipped the CEL on. I pull over and got it trailered home. I get home and after tearing into it realized it was the coolant hose that went to the thermostat (behind the header)

Now after realizing what I had found out later that day, following Monday I did a compression test and leak down test on it.

#1 -120psi
#2 -120psi
#3 -120psi

when I did the leak down test I had the hose off that went to the thermostat when doing the test, I had felt air pass through the thermostat.

checked the oil and its still clean no coolant mixture.

so with this all being said does anyone here have suggestions on whether I should slap new rings and head gasket or should I source another used engine and swap it out?

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post #2 of 3 Old 06-07-19, 07:19
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Its would be a time vs Money thing.
Time always being the most valuable sine you make money with time.

If its just a blown head, on cars we send the head out to get cleaned and machined and replace the headgasket. Normally a 3 day turn around.

If you can get a used motor faster and/or a little more than what it would cost you to replace the headgasket, i would go that route

Im surprised you had air coming out of your thermostat nipple vs your oil cap or even dipstick tube since. So it makes me think its just the headgasket that's leaking not a compression ring issue.

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post #3 of 3 Old 06-07-19, 23:10
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Sure sounds like a warped head or block, since all three cyls are the same. If you've no coolant in your engine oil, the pistons and bearings should still be good - no need for a replacement engine.

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