Quote:
Originally Posted by T@BD
TK ordered his new engine from us. The 175 engine I offer is a 62mm bored GY6, 174.5cc actual displacement. It's a direct bolt-in fit for the Spiderbox, mounts exactly the same as the original with no modification.
Tom after re-reading your last post, I think you might have the fake "200cc" GY6 engines on your mind. The "200cc" GY6 engines floating around the net that are actually 170cc (61mm). They're lying, intentionally fudging the numbers to create confusion and scam up sales.
This all can be very confusing to the uninitiated that might be reading. I wrote a detailed "beginners" article years ago that will help clear all of this up. Explains the relationship between Bore, Stroke, and displacement CC. And has a calculator you can use to interactively see how changing the bore size OR the stroke length will affect overall engine size.
https://www.**********.com/tech-cent...er-calculator/
Hmm... replace the stars in my link with the BD name to access the article. Then plug in 62mm bore and 58.8mm stroke to calculate the exact CC size of our 175cc engine. |
Hey Travis long time no speak. What I was referring to is a customer had brought me his older HH with a new 175cc engine he bought off of e-bay but it was out of an ATV which had internal reverse so the sprockets did not line up and had a different rear mount set up. He was told it was a drop in motor.As far as a stroker crank they are tricky to do. The 2mm crank is not so bad but when you use the spacer it lifts the cylinder up which makes the piston skirt drop down in the cylinder. When the crank transitions from bottom of stroke the skirt puts a lot of pressure on the lower half of the sleeve. If the cylinder sleeve is made of cast it will crack in time, the steel sleeves were not a problem.When you get to the 3mm stroke a different piston is used to alleviate the added pressure to the lower half of the sleeve. Anything larger a taller jug is needed. This is what I was trying to convey to him. Had I known it was a BD engine I would not have questioned it for I know of your good reputation.