Fixed my lack of bottom end (2000 kx250)

Aceofspades
Edited Date/Time 8/6/2015 5:41pm
Bought a stock cylinder head from ebay for $9-free shipping. Measured new head volume by using a syringe to fill chamber with oil(head not installed). The old head held 1/4 more oil! I dont know what my comp. Ratio was on the old head, but it mustve been super low. Id machined out the damage on the old head before i rebuilt the bike. Bike now has a fair amount of bottom pickup (i suspect the pro circuit pipe still is killing some bottom tho). Its a totally different bike now Smile
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Goodluckmonkey 8/6/2015 1:55pm
8/6/2015 1:55pm
Good to hear. Do you know what squish and compression ratio are you running now?
Aceofspades 8/6/2015 2:56pm
8/6/2015 2:56pm
Whatever the stock ratio is, i assume. Im betting that the original head that i had to machine the divots out of probably has 5:1 ratio lol. All i know is that i had a razor thin, all top end powerband. The upside is that it ran beautifully on cheap gas Smile
Aceofspades 8/6/2015 3:00pm
8/6/2015 3:00pm
I took a 55 mile trail ride last weekend and i had to drag the clutch to climb most of even the smallest hills. Ive got a 12 tooth sprocket coming that should help as well. Also orderd handgurads and a light lol.
My nephew has a 2013 ktm 250 mxc and riding it gave me the enduro bike bug. Ill wire the light into the powerjet circuit so i can make it home after dark.
RyanLester761
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RyanLester761 8/6/2015 4:46pm
8/6/2015 4:46pm
Nice work Jeff! It's amazing what a little compression will do for ya! Lol.

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KTMShane699
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KTMShane699 8/6/2015 5:07pm
8/6/2015 5:07pm
Be careful with a 12 tooth sprocket. That's pretty small and will load the shafts differently. It'll also cause the chain to come off the slider at a different angle and probably wear it faster and get it into your swingarm. Just things to consider.

Shane
Aceofspades 8/6/2015 5:38pm
8/6/2015 5:38pm
KTMShane699 wrote:
Be careful with a 12 tooth sprocket. That's pretty small and will load the shafts differently. It'll also cause the chain to come off the slider...
Be careful with a 12 tooth sprocket. That's pretty small and will load the shafts differently. It'll also cause the chain to come off the slider at a different angle and probably wear it faster and get it into your swingarm. Just things to consider.

Shane
I found that out with an 11 tooth sprocket! It didnt work.
Aceofspades 8/6/2015 5:41pm
8/6/2015 5:41pm
RyanLester761 wrote:
Nice work Jeff! It's amazing what a little compression will do for ya! Lol.
I know, right? Ill still try to get a stock pipe but this new head really improved my situation immensely. I literally had to burn the clutch on the trails last weekend due to zero low end.

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