National F15 windshield thoughts - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 4 (permalink) Old 04-05-2016, 08:07 PM Thread Starter
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National F15 windshield thoughts

Just sharing in case anyone else/in the future is considering one of these windshields.

I originally bought my Legend to serve as a hoon-around-town bike. Then I took a job 70 miles away and my Trophy broke the sprag clutch. Since the Legend was in a better state I decided to commute on it.

My commute is all slab. Between lane splitting (legal in Calif) and carpool lanes, I'm at or above the limit most of the way. The buffeting on my upper body and the bugs were really annoying, so I fitted an F15 screen.

The screen solved (mostly) the wind/bug problem, but the bike wasn't really comfortable to ride. The front end felt funny with it on.

Then... I broke the shield bumbling about in the garage. It was off the bike a week while I was epoxying the shield back together.

Sidebar... The F15 is acrylic, so acrylic cement works fine to put it back together, assuming you have all the shards. Yes, it doesn't look so great, but it works fine.

That week I had the shield off, the bugs and wind were a bugger, but the bike rode a lot better.

Today I decided to put the shield back on for the ride down. (I don't have to go to the office every day, and some days I carpool).

That uncomfortable front end feeling is back... and I'm debating what to do. I'm real glad I didn't spend the $100 plus on a replacement and just epoxied this one back together.

I also noticed that the angle of it is just right to really buffet my helmet. I assume when I broke it I moved the mounts and angled it some. I could stand it up more, but that might make the front end feel worse.

I might go with a smaller TBS style flyscreen. But that's unlikely to cut down on the wind on me, since the large F15 is hitting me in the helmet already - but they're not too expensive so I might try one. I've seen some Slipstreamers and something else I can't remember off the top of my head. Maybe Puig.

Of course, the real answer is to take the thing off entirely and use it as a hoon-around-town type bike, and fix the Trophy. Its so tossable and well balanced its kind of shame to beat it up on the slab with the shield on it... but I don't see that (Trophy fixing) happening this year.

I have a stock front suspension. Maybe some Ricors or Gold Emulators would make that better. Needs to be done anyway, but not till I fix the Trophy.

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post #2 of 4 (permalink) Old 04-06-2016, 04:43 AM
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I used a Puig screen for quite a while, not sure how an F15 compares? Part of the issue is possibly because the screen is attached to the bars/steering, rather than the bike's frame.

But what also happens, at higher speeds, imo, is that the front lifts a bit because of the screen, and the rear is likely squatting a bit due to chain pull and possibly because of not enough preload on the shock for your weight. The combined effect lightens the steering a bit, and makes the front feel a bit vague, yes? I'm not very tall, so also had the screen angled down a bit, which helped push the effect a bit higher up the speed range (into 3 digits).

Check the rider sag at the rear axle, go for about 30mm, no more.

It's likely the fork oil is completely shot as well, and that really won't help. Ricors would probably help, and if you fit them, I'd reccomend drilling out the (existing) damper rods, as if fitting Racetech emulators, which means you could then use a slightly thicker oil than the otherwise 5W Amsoil specified.

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post #3 of 4 (permalink) Old 04-06-2016, 11:53 PM
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I'm tall in the saddle, and have a National flyscreen. The way I originally mounted it (more vertical) I noticed the destabilising effects you're talking about. But angling it back towards the gauges (almost touching them) solved the problem completely. I was also surprised to discover that I feel no buffeting of my body or head at even high speeds, unless it's a ridiculously windy day, so the screen is working really well. However, I have 'M' bars, which bring me down quite low - enough to bring all but the very top of my helmet out of the turbulence. So... what kind of bars do you have?

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post #4 of 4 (permalink) Old 04-07-2016, 01:00 AM Thread Starter
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Stock Legend bars. Angling the shield a bit is easy. I'll try that. I have the zx9 rear shock to put on, that's likely easy enough I'll do that too and shore up the rear end.

Thanks for the thoughts/ideas/suggestions. They're appreciated.

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