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Old 10-01-2013, 09:53 AM   #1
Trailride802 OP
Joined: Oct 2013
Location: Vermont
Oddometer: 2
Question 78 dt 250 front end and suspension swap

Hey guys I have a 1978 yamaha dt 250. I'm looking to raise the whole bike And give it a little more modern look so I'm wondering how to swap front ends with a newer/taller bike and what kind of rear monoshock I could replace the stock with to raise it a bit.

Thanks guys!
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Old 10-01-2013, 05:14 PM   #2
Joined: Jan 2011
Location: You're Mama
Oddometer: 3,773
I put a CR250 front end on a DT400 I had and spaced the spring on the rear shock with a piece of PVC pipe to raise and stiffen it.
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Old 10-02-2013, 03:03 AM   #3
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Joined: Apr 2007
Location: Middle Park, Brisbane, Australia
Oddometer: 7,771
There are a few lists floating around custom bike sites that have a lot of old Jap bike steering stem bearing sizes like this one.

Scroll down and find your bike, and you will find others that share the same bearings, in your case,
Upper: 25 x 43 x 11
Lower: 30 x 48 x 12
Yamaha DT50B, DT50MX, DT50U/W/A (88-90)
Yamaha RD50MX (82), RX50K/L/MK (83-84)
Yamaha YSR50T-E (87-93)
Yamaha YZ50G (80)
Yamaha JT1/JT2/JT2MX (71-72)
Yamaha RD60/A/B (73-75)
Yamaha YZ60H/J/KM (81-83)
Yamaha DT80LC H/J/K (81-83), DT80MX
Yamaha GT80A-G (74-80), GT1/GTMX80 (73), GTMXA/MXB/MXC 80 (77-79), MX80G/H/J (80-82)
Yamaha RD80LC/MX(82)
Yamaha TY80A/B Trials (74-75)
Yamaha YZ80A-K (74-83)
Yamaha HT1/HT1B/HT1BM90 (70-71)
Yamaha AG100B
Yamaha DT100A-K (74-83)
Yamaha LT2/LT2M/LT2MX/LT3100 (72-73)
Yamaha MX100A/B (74-75)
Yamaha MX100F/H/J/K (79-83)
Yamaha RS100B/C (75-76)
Yamaha RT100A (90)
Yamaha YZ100C/D/E/F/G/H (76-81)
Yamaha AT1/AT1B/AT1C/ AT1E/AT1M/AT1MBAT1MX/AT2/AT2M/AT2MX/AT3/ 125 All (69-73)
Yamaha DT125 All (74-81), DT125LC (82)
Yamaha IT125G/H (80-81)
Yamaha MX125A/B/C (74-76)
Yamaha XT125J/K/KC (82-83)
Yamaha YT125N (85)
Yamaha YZ125A/B/C/X (74-76)
Yamaha AG175B
Yamaha CT1/CT2/CT3 175 All (69-73)
Yamaha DT175A-H (74-81)
Yamaha MX175A/B (74-75)
Yamaha MX175G/H/J (79-81)
Yamaha TY175B/C (75-76)
Yamaha YT175J/K Atv(82-83)
Yamaha YZ175C (76)
Yamaha SR185H/J (81-82)
Yamaha AG200
Yamaha BW200N/S/ES/ET/ EU (85-88)
Yamaha TW200 (87-92)
Yamaha TYM200EX/EL (83-84)
Yamaha XT200J/K/KC (82-83)
Yamaha YTM200K/EK (83), YTM200K/L (83-84)
Yamaha YTM225DXK (83)
Yamaha DT1/DT1B/DT1CMX/DT1MX/DT1S/ DT1C/DT1E/DT2/ DT2MX/DT250A-F/DT3 250 (68-79)
Yamaha MX250A/B (73-75)
Yamaha TT/XT250G/H/J (80-82)
Yamaha TY250A/C/D (74-77)
Yamaha XT250G/H/J/K/KC (80-83)
Yamaha XT250W (89)
Yamaha YZ250A/B/C (74-87)
Yamaha DT360A/B (74-75),
Yamaha MX360/A (73-74)
Yamaha RT1/RT1B/RTM/RT1MX360 (70-71)
Yamaha RT2/RT3/RT2MX360 (72-73)
Yamaha YZ360A/B (74-75)
Yamaha DT400B/C/D/E (75-78)
Yamaha IT400C (76)
Yamaha MX400B/C (75-76)
Yamaha YZ400B/C (75-76)
Yamaha SC500/A (73-74)
Yamaha SR500E/F/G/H (78-81)
Yamaha TT/XT500C-H (76-81)
Or find another set that has the same inner or outer bearing circumference and you could use a mixture of bearings to fit it.

This does not allow for different length stems though...

A KDX is way cooler than what ever you ride...
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Old 10-21-2013, 10:19 AM   #4
Trailride802 OP
Joined: Oct 2013
Location: Vermont
Oddometer: 2
Wow thank you! are those the only ones that would fit if I pressed out the ste
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Old 10-21-2013, 10:57 AM   #5
Gnarly Adventurer
Joined: Jun 2011
Location: Western mass USA
Oddometer: 158
You can use a set of forks off an RT180 they are a little longer and definatly ride better. Bolt right up.
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