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Question 1969 Yamaha L5T

  • 71-yamahaRob
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1969 Yamaha L5T was created by 71-yamahaRob

 I recently purchased a titled, gold 1969 Yamaha L5T Trailmaster a few months ago. The bike is in excellent condition, it has 3400 miles and I had bought it from the second owner. My question is for anybody who has owned or ridden one of these bikes, Is what is the top speed. I have been able to consistently hit 35 to 40 mph, and I was wondering if that is in line with other people’s experiences. Yamaha claimed it could go 60, which leads me to believe they overstated performance. 
thanks, Robert 
   
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1969 Yamaha L5T
1970 Yamaha L5TA
1971 Yamaha JT1
1976 Yamaha GT80
04 Dec 2021 06:58 #1

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Replied by MarkT on topic 1969 Yamaha L5T

The little "G" series rotary valves (72cc engine) will zip right up to 45... the "T" models aren't geared that tall but I'm sure they'd go faster if geared taller.  The "L" series rotary should get up to 55-60 pretty easy I'd guess.

First thing to check is if you have the transmission in high range.  I believe that model had a selector knob on the front sprocket that you rotate to select high or low range.

Next thing to check is the speedo...  after it was found sitting in an aircraft hanger in Arizona under a tarp for several decades, I cleaned up a nice RD350 several years ago.  It just wouldn't get up to speed...  or so I thought...  a friendly officer pulled me over and informed me that I was riding a WAY over the speed limit...  according to speedo, I wasn't even at the speed limit.  GPS speedometer apps are available for most phones these days and can be used to see if speedo is somewhat accurate.

 
 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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04 Dec 2021 07:17 #2

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Replied by 71-yamahaRob on topic 1969 Yamaha L5T

Unfortunately I am in high on the trans range and according to an app on my phone I was at a top speed of 35 last night, inline with my speedometer! The chain and sprockets are way overdue on replacement, could that make that big of a difference? Yamaha stated the bike would go 35 in the low, I normally hit 15-20- and 20 is pushing it.
1969 Yamaha L5T
1970 Yamaha L5TA
1971 Yamaha JT1
1976 Yamaha GT80
04 Dec 2021 07:34 #3

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Replied by MarkT on topic 1969 Yamaha L5T

Sounds like something is wrong to me from what you are saying.   

Not sure a worn chain would be an issue if lubricated...  rusty or "bound up", could suck up some power..  There's a risk of serious and expensive damage if chain breaks so keep that in mind. 

Others have L5T's...  the old bikes are not super fast by modern standards but a legitimate 35 seems slow. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
04 Dec 2021 07:55 #4

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Replied by 71-yamahaRob on topic 1969 Yamaha L5T

I think I will replace the sprockets an chain to be sure- is there a website to purchase oem style sprockets as they don’t sell them for the L5T on partzilla, does someone make reproductions?
1969 Yamaha L5T
1970 Yamaha L5TA
1971 Yamaha JT1
1976 Yamaha GT80
04 Dec 2021 08:16 #5

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Replied by asco on topic 1969 Yamaha L5T

Normally, ignition timing, carburetor, air leaks, and spark plug heat range can make subtle differences. The age and condition of the engine also plays a role. Chain / Sprockets are for safety in my opinion. I would not want to be on old tires above 40 mph..

a
YAMA-LAND RESTORATIONS, 818-521-2109 This email address is being protected from spambots. You need JavaScript enabled to view it. 1971 CT1-C (BRANDY) 1970 DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL) 1972 AT2M (ARNOLD ZIFFLE)
Last edit: 04 Dec 2021 09:17 by asco.
04 Dec 2021 09:16 #6

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Replied by Ht1kid on topic 1969 Yamaha L5T

Not trying to hijack the post.. MarkT love the 75 rd350 I traded a coke machine restoration for one they are wheelie kings
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Last edit: 04 Dec 2021 10:35 by Ht1kid. Reason: No dot
04 Dec 2021 09:50 #7

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