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Very good tutorial, Jalat. Power consumption of this type of grip heater is like 10 watts, so the relay may be optional in most cases. Another nice feature is that you can use DC or AC as the power source. Scoots with AC headlights can power these grips right off the lighting circuit. This means no chance of a dead battery whether you leave the grips on or off.

Randy, check out my last post which was edited after your post. I referenced this kit which I thought was your best value:

.scrappydogscooters.com/LH170MN_Linhai_257___275.html" rel="nofollow" target="_blank">.scrappydogscooters.com/LH170MN_Linhai_257___275.html

The chinesepartswholesale site doesn't show parts for the Linhai.

Thanks for the info Rich. To my knowledge, there are only two Chinese 250cc water cooled engines commonly available - the Linhai and Honda clones. The muffler I referenced definitely does not fit the Honda. It is a one piece and it apparently avoids the problem that speedracer ran into because of this.

Welcome, jeepmaster322. A diehard scoot rider with many years of experience who likes to do some wrenching. I bet you have a lot of interesting stories about your scooters and riding in general.

I have 19 gram sliders. My scoot came with 23 gram rollers. Top speed in both cases was essentially the same. I have not monitored my fuel mileage, but I think I'm in the low to mid 60's

I think you might gain 2 to 3 mph with lighter weights. The heavy weights have the engine developing max torque (5500 rpm) at 68 mph in your scoot. Dropping the weights to 19 or 20 grams will allow the engine to hit over 6500 rpm which is the max horsepower band. However, the torque drops off so there is a trade off. Around 70 - 75 mph is about max for this engine depending on tune and environmental factors. So, lighter weights will improve acceleration while sacrificing a little fuel mileage. If you are happy with your performance, you might just leave well enough alone. If your original rollers were 23 grams, then you could go to 21 gram sliders with improved acceleration and a minimal hit on fuel mileage and maybe a little more top speed.

Hi Jalat. These engines develop max power at around 6500 rpm, so you are not getting in the max power range.

With 19 gram sliders, I believe I must have better acceleration than your scoot. I hit about 6000 rpm on initial acceleration and can pull over 7000 rpm on top end. I believe your top is 68 mph which is at 5500 rpm? That is a low engine speed for the road speed. You probably can go pretty fast downhill because you have a lot of rpms left.

I'm curious how you got all the air out of the system.

I also was expecting better results from your mod. I was thinking about this and here are my thoughts:

Opening the belly pan for additional ventilation for the copper tubes may have inadvertently robbed some of the cooling air from the main radiator. There is airflow to the radiator when the scoot is moving. The floor pan and the plastic hump above it form an air tunnel which directs air from the front to the radiator. Opening the floor pan allows too much air to bypass the main radiator. I would try blocking off the floor pan to see if there is an improvement.

The ultimate setup would be a small oil cooler setup right behind the front grill while still using the tube setup you have in the belly pan. This would probably be real easy to hook up.