By Scott Davis on Unrecorded Date: Edit

Just recently i bored out my l295 clyender and put a l297 piston in it. What changes to the engine needs to be made to make it run better? Exhaust? Carborator? Ignition? thanks for the help.

Scott

By kush on Unrecorded Date: Edit

SCott,

JLO manual uses a different plug for a 297.

Bosch M225T1 or Champion UK10 0.018" gap

This seems to be the only difference Carb & timing are the same. You might have to rejet the carb tho.

By Scott Davis on Unrecorded Date: Edit

ok about the carb. You say rejet. Do you mean adjusting the high and low needles? or what exactly do you mean by rejet and how can i do it?

By kush on Unrecorded Date: Edit

Run the engine with the correct plug. DRive it around & see how it performs. Pull, the plug & read it. Is it fouling, running rich or lean. Did the engine have power thru it's whole operating range. DEpedning upon the make of carb you can pull the jet & get a bigger or smaller one. Find a snowmobile manual or a manual for your of carb. Find the size of jet that is in there & experiment from there. Since the size difference from a 295 to 297 is only 1.007 % then you might have to size the jet up at last that much

By Scott Davis on Unrecorded Date: Edit

hey is that 1.007 cm or mm also can anyone tell me what a Bosch M225t1 sparkplug converts to a 13/16ths size What i did was put an insert in the head so that i wouldnt wear out the alluminum threads and also cause i coulndt find the regular size anymore

also is it possible that i can drill out the hole in the jet or can i just buy one that will work?

By kush on Unrecorded Date: Edit

1.007% so your jet size should be at least 1.007% bigger. Depending upon the carb you should be able to buy new jets. If not drill it out.

Bosch or Champion should have conversion charts on the net