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Any thoughts on this one or experience with it?

Reading here in the forum I see that somewhere around 50/50 ration of water to coolant concentrate is optimal and the freeze point is elevated by too much water and by too little water. I'm looking at green coolant, it's clean, and the Prestone hygrometer says the freeze point is 7 degrees F...

On a 1989 HD FLHTC, haven't found any documentation or instructions yet. Whatever was supposed to keep the center stand retracted and/or limit the rotation when in use isn't there. Anybody here know anything about these things?

2002 GMC Sierra 1/2 ton 4.8L V-8, fan clutch is always engaged. Is there any way to tell before I start pulling things apart if this fan clutch is thermally controlled or electrically controlled? Thanks!

On 1960s and 1970s era military aircraft like the F-4, F-111, KC-135, was there any way to tell from outside the aircraft if the radar or guidance systems were in use when the aircraft was on the ground and running? If the landing lights are on does that necessarily mean any other systems like...

5-speed Harley over 30 years old, leaking transmission main drive gear seal. Replacing the seal means the better part of a day on the lift, and you can change these seals and have them leak again the next day. And if we're going to pull the primary drive now we're halfway to the swingarm, and...

I think I got the resin to catalyst ratio about right, the resin on the glass mat hardened up fine but the resin around the mat on the original piece is still tacky after five hours. Heat gun seems to help a little but not much. What's the next step?

Is there any advantage to a synthetic blend oil? https://www.maidstonehd.co.uk/products/genuine-syn-blend-motorcycle-oil-15w-50

Short of buying a can and reading the label, anyone here know a way to determine what the specs on this grease is, and most importantly, is if lithium-based? https://www.harley-davidson.com/us/en/shop/h-d-wheel-bearing-grease-can/p/99855-89

Is there a commercially available product that would be safe to use for flushing the oil system on a roller bearing crank, OHV engine? I'm thinking about something that could be added to HDEO like maybe Rotella, run at an idle until warm, and drained. Not something that would be part of a...

Search function didn't turn up anything on this, so here's a question for the oil experts -- Eaton specified HDEO SAE 50 for their 10-speed transmission, I ran Delo 400 SAE 50 and it worked great. But it's sold in 5 gallon buckets, I won't be needing that much. Other than the lower TBN and the...

Is there a reasonably inexpensive commercially available (like available for retail purchase) dye that can be added to oil without diminishing the characteristics of the oil or interfering with its function? I have a motorcycle transmission that leaks enough such that the oil is always clean, I...

I just took the top off a 4-speed Shovelhead transmission that I built in 1992. I have no idea how many miles are on the gear set because the bike didn't have a speedometer for about 15 of those years, but I know the bike got three top end overhauls during that time, was flat worn out at the...

https://goaxil.com/products/gx-extreme Anyone here tried these?

As air filters go from brand new to slightly dirty they become somewhat less efficient in terms of possible total flow but they become more effective at filtering out the smaller particles. According to the service clinics I attended it's better to not change an air filter sooner than necessary...

If we assume two straight-weight conventional oils, same manufacturer and brand, the only difference is one is SAE50 and one is SAE60, what will be the difference in flow characteristics at 125 degrees Fahrenheit?

Harley Evo, owner has Lucas 20w-50 synthetic for V-Twins in it now. Is there any sound scientific reason why Mobil1 20w-50 for V-Twins should not be used for top-up until the next oil change?

I've got a good set of rethread taps and dies AKA thread chasers, and I understand why it's not a good idea to use a regular tap to clean up an existing threaded hole. The set only goes down to M6 and I need to clean up an M5 x 0.8 hole. I have had no luck finding an M5 thread chaser. Would...

A bowl gouge for turning wood made from a piston wristpin. Want to harden the edge slightly, thinking maybe there is some way to determine if oil, water, or brine might be the better quench. Any experience in such things?

Anybody got any experience with the Kubota 2403 like what's in the L47 TLB? Helping a friend who rolled the tractor, acts like it's hydro-locked. Thinking it might be best/easiest to pull the injectors