Jerome Kretzman Crankshaft Services

Jerome Kretzman Crankshaft Services Crankshaft sales, parts & rebuilding service for Snowmobile, ATV, & Dirt Bike. Now offering balancing .

Long rod, short Pto 340 TX crank is done. Is balance factored for the longer rod & 64 mm XLT pistons.
06/12/2026

Long rod, short Pto 340 TX crank is done. Is balance factored for the longer rod & 64 mm XLT pistons.

Performance starts with a well built crankshaft and crankcase. Vibration and unbalance is detrimental to power, performa...
05/07/2026

Performance starts with a well built crankshaft and crankcase. Vibration and unbalance is detrimental to power, performance & longevity. Bearing to case interference and main bearing alignment can cause added friction & parasitic power loss …

04/28/2026

Another crank project on the balance fixture. This one is a NOS XLT triple Polaris built into a twin cylinder. 60 stroke with longer rod than stock. It’s fit up for 340 TX crankcase. Bob weight is built up for rod & piston reciprocating weight. This set up will be for a 340 Polaris Super Mod oval racer ……….

04/25/2026

Checking the balance factor on a 340 TX Polaris crank project with short PTO ,3 mm longer rod & 64 mm bigger piston. Bob weight is calculated for the heavior rod & piston.
Looking like it will take 26 grams of mallory to get too the factor I’m shooting for …..

Just finished & shipped this 340 R Sachs. Installed a steel rod & checked & changed the balance factor for the new rod a...
04/22/2026

Just finished & shipped this 340 R Sachs. Installed a steel rod & checked & changed the balance factor for the new rod and bigger piston assembly ………..

04/18/2026

340 R , C Model Sachs on the balancer. Bob weight is built up for the steel rod conversion & bigger piston. Steel rod set up is 16 grams lighter even with the top needle bearing!

Just finished up 340 Kohlar / Mercury crankshaft, installed skidoo C4 Pinned bearings. Checking the case for bearing to ...
04/14/2026

Just finished up 340 Kohlar / Mercury crankshaft, installed skidoo C4 Pinned bearings. Checking the case for bearing to case interference & truing up with the sunnen line honing bar.
TJ Braith Super Stock project

Congratulations Joe Burns for winning the super mod 440 class at Butterfield Mn. Your engine building & tuning skills ar...
02/13/2026

Congratulations Joe Burns for winning the super mod 440 class at Butterfield Mn. Your engine building & tuning skills are second to none. Appreciate your trust in my crankshaft projects for you !!

Just finished up two 440 TX Polaris race crankshafts. Both cranks have short billet PTO ends. The one on the top has aft...
02/13/2026

Just finished up two 440 TX Polaris race crankshafts. Both cranks have short billet PTO ends. The one on the top has aftermarket rods with the better flat caged lower rod bearings. They were both shipped to New York for Dan CiHocki‘s 440 super mod ….

Just finished up this skidoo crank that is modified to fit in a 440 TX Polaris crankcase. Has a longer stroke & longer w...
02/08/2026

Just finished up this skidoo crank that is modified to fit in a 440 TX Polaris crankcase. Has a longer stroke & longer wossner rod. Balance factor was changed to compensate for the longer & heavier rods. This project is for Joe mod race engines.

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5424 Ashdale Lane
Baxter, MN
56425

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