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Everything Dirt Bike
Make / Model Specific
Yamaha
1978 DT 175 Build Thread
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<blockquote data-quote="sjsingle1" data-source="post: 161231" data-attributes="member: 1664"><p>i am JELLY....my first bike in high school was a blue 78 DT175......bought it new for 800$ ......the best mods you can do is take out that ridge in the air box behind the air filter....and i used a KN filter ( bet they dont make em anymore for this bike ) and took off the air box lid and strapped that filter down with a metal strap......stock the air box REALLY kills flow !! I also ported the piston to match the cylinder ....those two mods i bet added 5hp......but bein the noob I was back then about jetting after increasing airflow as much as those mods I did....I blew a few pistons......the smallish carb ....24mm if I remember correctly....does not offer many choices in jets sizes other than main jets......had to get some new stock size pilot jets and drill them out to larger sizes.......the increase in HP made the tranny really close ratio......had to go to a really small rear sprocket to spread out the ratio again</p><p></p><p>the stock suspension really sucks.......I always wanted to get a mono shock out of a YZ to swap out to see if that would make it better</p><p></p><p>I would love to get another one but the prices I see on ebay are outrageous....2000$ for a 30 yr old bike....really????.......and parts are kinda in short supply</p><p></p><p>but the memories.....ahhhhh......rode that thing everywhere</p></blockquote><p></p>
[QUOTE="sjsingle1, post: 161231, member: 1664"] i am JELLY....my first bike in high school was a blue 78 DT175......bought it new for 800$ ......the best mods you can do is take out that ridge in the air box behind the air filter....and i used a KN filter ( bet they dont make em anymore for this bike ) and took off the air box lid and strapped that filter down with a metal strap......stock the air box REALLY kills flow !! I also ported the piston to match the cylinder ....those two mods i bet added 5hp......but bein the noob I was back then about jetting after increasing airflow as much as those mods I did....I blew a few pistons......the smallish carb ....24mm if I remember correctly....does not offer many choices in jets sizes other than main jets......had to get some new stock size pilot jets and drill them out to larger sizes.......the increase in HP made the tranny really close ratio......had to go to a really small rear sprocket to spread out the ratio again the stock suspension really sucks.......I always wanted to get a mono shock out of a YZ to swap out to see if that would make it better I would love to get another one but the prices I see on ebay are outrageous....2000$ for a 30 yr old bike....really????.......and parts are kinda in short supply but the memories.....ahhhhh......rode that thing everywhere [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1978 DT 175 Build Thread
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