What is the model number of the front shock absorber oil seal for the Tianhong 90 motorcycle?
2 Answers
Motorcycle Tianhong 90 front shock absorber oil seal 30-40-7.5/9.5, 30-42-10.5 Tianhong 90 shock absorber seal 30-42-10.5. Introduction to oil seals: An oil seal is a mechanical component used to seal oil (oil is the most common liquid substance in transmission systems, and it also generally refers to liquid substances). It isolates the parts that need lubrication in the transmission system from the output parts to prevent lubricant leakage. Sealing components used for static sealing and dynamic sealing (generally reciprocating motion) are called seals. Representative form of oil seals: The representative form of oil seals is the TC oil seal, which is a double-lip oil seal fully covered with rubber and equipped with a self-tightening spring. Generally, oil seals often refer to this type of TC skeleton oil seal.
Last week, I just helped a friend replace the front fork oil seal on a Tianhong 90. The model issue is quite common. The oil seal for this bike is typically sized at 27x43x7mm, but specific model numbers like TH90-123 depend on the year and version. I recommend checking the vehicle manual first, as it lists the original part number. If unavailable, remove the old oil seal to measure the inner and outer diameters, then purchase a matching new one. Be careful to prevent dust from entering the fork tube during replacement to avoid oil leakage issues. Over time, oil seals can wear out, causing the bike to bounce and lose control, severely affecting braking safety—don’t delay repairs. Regular inspections save hassle. I usually buy from branded parts stores, where prices range between 20 to 50 yuan. Avoid cheap, low-quality parts, or you’ll end up repairing again in a few weeks, wasting time and money.
