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1974 DT100A Restoration

  • imagelessJAKE
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Replied by imagelessJAKE on topic 1974 DT100A Restoration

So here are the forks that I took a bit of a risk on - they dont appear to be stock forks but apparently came off a 74 DT100 - I'm curious to know if they will work.

From asking the owner - the inners are 30mm and I have stock triple tree parts as well.

The plan is to swap the forks on this set into the OEM triple tree set I have. 

 

 
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
03 Dec 2021 08:44 #21

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Replied by Schu on topic 1974 DT100A Restoration

"And you'll also get a cool "site supporter" badge if you donate!"

Just donated, and have done so in the past, but have yet to get the badge. I assume it is due to the fact that I use my wife's PayPal account which carries a different email address than what is in the database for this forum. I sure hope the donation still hits the target.

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Edit:
Ha.. just got an email acknowledgement on my own personal email address saying that it was received, so that proves it hit the target! 

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Schu

CT1B, CT1C, JT1, JT2, DT360A, GT80B, DT100B, DT125B,
DT175B, DT175C, DT250B, DT400B, Z50, SCR950

Someday, you'll own some Yamahas
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Last edit: 03 Dec 2021 09:48 by Schu.
03 Dec 2021 09:37 #22

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Replied by MarkT on topic 1974 DT100A Restoration

If you use those triples, they will hit the tank.  And probably not great to use leading axle forks with your triples.  

might be able to use your lowers on those inners?
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
03 Dec 2021 10:44 #23

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  • imagelessJAKE
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Replied by imagelessJAKE on topic 1974 DT100A Restoration

Might have miscommunicated here. I have a OEM/Stock triple tree set from a DT100 - my plan is to remove the forks from the triple tree set you see pictured, and place the forks into the OEM/Stock triple tree set.

If they are 30mm like the stock set are - then surely they wouldnt slap against the tank - also couldnt i rotate the shocks around such that the axle is rear facing?

The real reason I'm doing this is so that I can fit the OEM replica high front fender underneath the lower triple tree unit. However if these dont work I can always make a work around to fit the front fender onto these smaller triple tree.

but I figured $50 for a triple tree was worth the risk to try 

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'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
Last edit: 03 Dec 2021 11:17 by imagelessJAKE.
03 Dec 2021 11:13 #24

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Replied by MarkT on topic 1974 DT100A Restoration

You didn't miscommunicate. 

Leading axle forks should be used with the matching triples with less forward offset.  And they will hit tank.

Using your stock triples with those forks (bad idea) or with stock triples and axle flipped to rear (really bad idea) completely screws up the steering geometry and the handling.

And again, if your upper tubes are bad you might be able to swap your lowers on to those uppers.

 
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
03 Dec 2021 12:03 #25

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Replied by imagelessJAKE on topic 1974 DT100A Restoration

I think I understand - I dont really know much about geometry/rake angle importance so I'll take your word on it.

If thats the case I might just find a way to finess the front fender onto the lower triple tree and keep my eye out for a true DT100A Fork set.

In the meantime I placed a nice gold chain from protaper on there and it works out well - although 1 of the rear wheel adjustment bolts is completely snapped

d X_X


 
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
03 Dec 2021 12:12 #26

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Replied by MarkT on topic 1974 DT100A Restoration

If it's just about the fender, they make brackets to mount a high fender to the older triples...  but you said you have the original triples which in 74 should have had the high fender?

I'm confused... 

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  But I'm sure you know what you're doing. 

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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
03 Dec 2021 12:19 #27

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Replied by imagelessJAKE on topic 1974 DT100A Restoration


I am confused as well! I hope I can clarify!

The front end currently on the bike is not correct - it appears to have forks, triple tree, fenders, and headlight brackets from what appears to be an early 70's Enduro 90 - I guess this because of the shape of the headlight brackets and the lower mounted fender.

This is an issue for me because the lower triple tree have only 2 holes for mounting a front fender, not to mention the fork tube inners are smaller than what came on a 74 DT100

Not only that but upper triple that came with the bike unfortunately has the handlebar mounts completely cross threaded. So I purchased a new triple tree set only to discover the smaller fork tube inners. 

So now I have to make the decision of:

A.) Do I run the smaller setup that came with the bike tap the threads for the handlebar mounts and get new bolts put in, then try to make the fender work even with only having 2 holes using an adapter like you said (this would also mean I would have those dorky fender stays handing off the fork lowers)

or

B.) Try to source the correct forks and simply place them in the correct triple tree set that I purchased - and have 4 correct holes for the fender

big decisions - real head scratching stuff.
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
03 Dec 2021 12:44 #28

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Replied by MarkT on topic 1974 DT100A Restoration

Got it. 

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I don't know if I have any 30mm forks laying around..  I'll look.
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
03 Dec 2021 13:11 #29

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Replied by adguy2112 on topic 1974 DT100A Restoration

As a note I was able to mount the small fender mounting bracket from a 1979 DT100 onto my LT2 so I didn't need to use a large clunky mounting bracket for a high fender. There is a rough one on ebay for $10 and a few others that are included with trees and such. Might work for you. 
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03 Dec 2021 15:03 #30

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