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Question SLEEPER PIPES FOR YAMAHA ENDUROS

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Replied by MarkT on topic SLEEPER PIPES FOR YAMAHA ENDUROS

My guess is Mr. Burlybilt bought a bike with a sleeper pipe.  But until he looks for the tag we'll never know...  

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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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05 Oct 2021 16:51 #231

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Replied by chuckw on topic SLEEPER PIPES FOR YAMAHA ENDUROS

Great thread here. discovered that my modified 400 came with SP 77! Look forward to trying it on the stock 400 soon.
69 DT1, 75 DT400 (2), 86 XT600, 78 Honda XR50, several 70's/80's MX bikes, 2021 Husky FE350
19 Dec 2021 11:56 #232

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  • Pedalcrazy
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Replied by Pedalcrazy on topic SLEEPER PIPES FOR YAMAHA ENDUROS

Chuckw…I put a SP from Meis on my stock DT400C and noticed improved low and mid power increase right away. I’m too afraid to really test upper end LOL.  Honestly when I installed it and took off for the first time I nearly flipped it! I put quite a few miles on the bike before the pipe so was familiar with it’s power. So almost flipped it should warn you to hang on once you have yours installed.
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (Project)
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19 Dec 2021 13:01 #233

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Replied by msavitt on topic SLEEPER PIPES FOR YAMAHA ENDUROS

Wow - I love your description of results!
Did you have to adjust jetting or anything else when you installed SP, or just put it on and cruised ?
19 Dec 2021 17:11 #234

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Replied by Pedalcrazy on topic SLEEPER PIPES FOR YAMAHA ENDUROS

Martin…I’ve messed with all aspects of the carb so many times that I don’t remember. My best guess is no immediate changes needed. BTW I was so impressed that I wanted one for my 78 DT400E but Meis said he doesn’t make one for that bike. Makes me think the stock pipe on the 78 must already be pretty good.
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (Project)
19 Dec 2021 20:13 #235

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Replied by chuckw on topic SLEEPER PIPES FOR YAMAHA ENDUROS

Wow, that sounds like a great improvement! Will try it out as soon as it stops raining buckets around here.

How does your 78 compare stock to the 400C? I'd like one of that vintage sometime if I come across one,
69 DT1, 75 DT400 (2), 86 XT600, 78 Honda XR50, several 70's/80's MX bikes, 2021 Husky FE350
20 Dec 2021 08:10 #236

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Replied by Pedalcrazy on topic SLEEPER PIPES FOR YAMAHA ENDUROS

My stock 78 DT400E isn’t as strong running as my stock 76 DT400C with the sleeper pipe. I didn’t have the 78 when I had the 76 with out the pipe.  

And both are fresh restorations with new top ends. Come to think both are 3rd over too.
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (Project)
Last edit: 20 Dec 2021 11:08 by Pedalcrazy.
20 Dec 2021 11:07 #237

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